/**
 * Cloud Firestore
 *
 * @packageDocumentation
 */

import { DocumentData as DocumentData_2 } from '@firebase/firestore-types';
import { EmulatorMockTokenOptions } from '@firebase/util';
import { FirebaseApp } from '@firebase/app';
import { FirebaseError } from '@firebase/util';
import { _FirebaseService } from '@firebase/app';
import { SetOptions as SetOptions_2 } from '@firebase/firestore-types';

/**
 * Creates an expression that computes the absolute value of a numeric value.
 *
 * @param expr - The expression to compute the absolute value of.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the absolute value of the numeric value.
 */
export declare function abs(expr: Expression): FunctionExpression;

/**
 * Creates an expression that computes the absolute value of a numeric value.
 *
 * @param fieldName - The field to compute the absolute value of.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the absolute value of the numeric value.
 */
export declare function abs(fieldName: string): FunctionExpression;

/**
 * Converts Firestore's internal types to the JavaScript types that we expose
 * to the user.
 *
 * @internal
 */
declare abstract class AbstractUserDataWriter {
    convertValue(value: Value, serverTimestampBehavior?: ServerTimestampBehavior): unknown;
    private convertObject;
    /**
     * @internal
     */
    convertObjectMap(fields: ApiClientObjectMap<Value> | undefined, serverTimestampBehavior?: ServerTimestampBehavior): DocumentData_2;
    /**
     * @internal
     */
    convertVectorValue(mapValue: MapValue): VectorValue;
    private convertGeoPoint;
    private convertArray;
    private convertServerTimestamp;
    private convertTimestamp;
    protected convertDocumentKey(name: string, expectedDatabaseId: DatabaseId): DocumentKey;
    protected abstract convertReference(name: string): unknown;
    protected abstract convertBytes(bytes: ByteString): unknown;
}

/**
 * Describes a map whose keys are active target ids. We do not care about the type of the
 * values.
 */
declare type ActiveTargets = SortedMap<TargetId, unknown>;

/**
 *
 * Creates an expression that adds two expressions together.
 *
 * @example
 * ```typescript
 * // Add the value of the 'quantity' field and the 'reserve' field.
 * add(field("quantity"), field("reserve"));
 * ```
 *
 * @param first - The first expression to add.
 * @param second - The second expression or literal to add.
 * @param others - Optional other expressions or literals to add.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the addition operation.
 */
export declare function add(first: Expression, second: Expression | unknown): FunctionExpression;

/**
 *
 * Creates an expression that adds a field's value to an expression.
 *
 * @example
 * ```typescript
 * // Add the value of the 'quantity' field and the 'reserve' field.
 * add("quantity", field("reserve"));
 * ```
 *
 * @param fieldName - The name of the field containing the value to add.
 * @param second - The second expression or literal to add.
 * @param others - Optional other expressions or literals to add.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the addition operation.
 */
export declare function add(fieldName: string, second: Expression | unknown): FunctionExpression;

/**
 * Options defining how an AddFieldsStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(addFields:1)}.
 */
export declare type AddFieldsStageOptions = StageOptions & {
    /**
     *  The fields to add to each document, specified as a {@link @firebase/firestore/pipelines#Selectable}.
     *  At least one field is required.
     */
    fields: Selectable[];
};

/**
 *
 * A class that represents an aggregate function.
 */
export declare class AggregateFunction implements ProtoValueSerializable, UserData {
    private name;
    private params;
    exprType: ExpressionType;
    /**
     * @internal
     */
    _methodName?: string;
    constructor(name: string, params: Expression[]);
    /**
     * @internal
     * @private
     */
    static _create(name: string, params: Expression[], methodName: string): AggregateFunction;
    /**
     * Assigns an alias to this AggregateFunction. The alias specifies the name that
     * the aggregated value will have in the output document.
     *
     * @example
     * ```typescript
     * // Calculate the average price of all items and assign it the alias "averagePrice".
     * firestore.pipeline().collection("items")
     *   .aggregate(field("price").average().as("averagePrice"));
     * ```
     *
     * @param name - The alias to assign to this AggregateFunction.
     * @returns A new {@link @firebase/firestore/pipelines#AliasedAggregate} that wraps this
     *     AggregateFunction and associates it with the provided alias.
     */
    as(name: string): AliasedAggregate;
    /**
     * @private
     * @internal
     */
    _toProto(serializer: JsonProtoSerializer): Value;
    _protoValueType: "ProtoValue";
    /**
     * @private
     * @internal
     */
    _readUserData(context: ParseContext): void;
}

/**
 * Options defining how an AggregateStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(aggregate:1)}.
 */
export declare type AggregateStageOptions = StageOptions & {
    /**
     * The {@link @firebase/firestore/pipelines#AliasedAggregate} values specifying aggregate operations to
     * perform on the input documents.
     */
    accumulators: AliasedAggregate[];
    /**
     * The {@link @firebase/firestore/pipelines#Selectable} expressions or field names to consider when determining
     * distinct value combinations (groups), which will be aggregated over.
     */
    groups?: Array<string | Selectable>;
};

/**
 *
 * An AggregateFunction with alias.
 */
export declare class AliasedAggregate implements UserData {
    readonly aggregate: AggregateFunction;
    readonly alias: string;
    readonly _methodName: string | undefined;
    constructor(aggregate: AggregateFunction, alias: string, _methodName: string | undefined);
    /**
     * @private
     * @internal
     */
    _readUserData(context: ParseContext): void;
}

export declare class AliasedExpression implements Selectable, UserData {
    readonly expr: Expression;
    readonly alias: string;
    readonly _methodName: string | undefined;
    exprType: ExpressionType;
    selectable: true;
    constructor(expr: Expression, alias: string, _methodName: string | undefined);
    /**
     * @private
     * @internal
     */
    _readUserData(context: ParseContext): void;
}

/**
 *
 * Creates an expression that performs a logical 'AND' operation on multiple filter conditions.
 *
 * @example
 * ```typescript
 * // Check if the 'age' field is greater than 18 AND the 'city' field is "London" AND
 * // the 'status' field is "active"
 * const condition = and(greaterThan("age", 18), equal("city", "London"), equal("status", "active"));
 * ```
 *
 * @param first - The first filter condition.
 * @param second - The second filter condition.
 * @param more - Additional filter conditions to 'AND' together.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logical 'AND' operation.
 */
export declare function and(first: BooleanExpression, second: BooleanExpression, ...more: BooleanExpression[]): BooleanExpression;

declare interface ApiClientObjectMap<T> {
    [k: string]: T;
}

/**
 *
 * Creates an expression that creates a Firestore array value from an input array.
 *
 * @example
 * ```typescript
 * // Create an array value from the input array and reference the 'baz' field value from the input document.
 * array(['bar', field('baz')]).as('foo');
 * ```
 *
 * @param elements - The input array to evaluate in the expression.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the array function.
 */
export declare function array(elements: unknown[]): FunctionExpression;

/**
 * Creates an aggregation that collects all values of an expression across multiple stage
 * inputs into an array.
 *
 * @remarks
 * If the expression resolves to an absent value, it is converted to `null`.
 * The order of elements in the output array is not stable and shouldn't be relied upon.
 *
 * @example
 * ```typescript
 * // Collect all tags from books into an array
 * arrayAgg(field("tags")).as("allTags");
 * ```
 *
 * @param expression - The expression to collect values from.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'array_agg' aggregation.
 */
export declare function arrayAgg(expression: Expression): AggregateFunction;

/**
 * Creates an aggregation that collects all values of a field across multiple stage inputs
 * into an array.
 *
 * @remarks
 * If the expression resolves to an absent value, it is converted to `null`.
 * The order of elements in the output array is not stable and shouldn't be relied upon.
 *
 * @example
 * ```typescript
 * // Collect all tags from books into an array
 * arrayAgg("tags").as("allTags");
 * ```
 *
 * @param fieldName - The name of the field to collect values from.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'array_agg' aggregation.
 */
export declare function arrayAgg(fieldName: string): AggregateFunction;

/**
 * Creates an aggregation that collects all distinct values of an expression across multiple stage
 * inputs into an array.
 *
 * @remarks
 * If the expression resolves to an absent value, it is converted to `null`.
 * The order of elements in the output array is not stable and shouldn't be relied upon.
 *
 * @example
 * ```typescript
 * // Collect all distinct tags from books into an array
 * arrayAggDistinct(field("tags")).as("allDistinctTags");
 * ```
 *
 * @param expression - The expression to collect values from.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'array_agg_distinct' aggregation.
 */
export declare function arrayAggDistinct(expression: Expression): AggregateFunction;

/**
 * Creates an aggregation that collects all distinct values of a field across multiple stage inputs
 * into an array.
 *
 * @remarks
 * If the expression resolves to an absent value, it is converted to `null`.
 * The order of elements in the output array is not stable and shouldn't be relied upon.
 *
 * @example
 * ```typescript
 * // Collect all distinct tags from books into an array
 * arrayAggDistinct("tags").as("allDistinctTags");
 * ```
 *
 * @param fieldName - The name of the field to collect values from.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'array_agg_distinct' aggregation.
 */
export declare function arrayAggDistinct(fieldName: string): AggregateFunction;

/**
 *
 * Creates an expression that concatenates an array expression with other arrays.
 *
 * @example
 * ```typescript
 * // Combine the 'items' array with two new item arrays
 * arrayConcat(field("items"), [field("newItems"), field("otherItems")]);
 * ```
 *
 * @param firstArray - The first array expression to concatenate to.
 * @param secondArray - The second array expression or array literal to concatenate to.
 * @param otherArrays - Optional additional array expressions or array literals to concatenate.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the concatenated array.
 */
export declare function arrayConcat(firstArray: Expression, secondArray: Expression | unknown[], ...otherArrays: Array<Expression | unknown[]>): FunctionExpression;

/**
 *
 * Creates an expression that concatenates a field's array value with other arrays.
 *
 * @example
 * ```typescript
 * // Combine the 'items' array with two new item arrays
 * arrayConcat("items", [field("newItems"), field("otherItems")]);
 * ```
 *
 * @param firstArrayField - The first array to concatenate to.
 * @param secondArray - The second array expression or array literal to concatenate to.
 * @param otherArrays - Optional additional array expressions or array literals to concatenate.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the concatenated array.
 */
export declare function arrayConcat(firstArrayField: string, secondArray: Expression | unknown[], ...otherArrays: Array<Expression | unknown[]>): FunctionExpression;

/**
 *
 * Creates an expression that checks if an array expression contains a specific element.
 *
 * @example
 * ```typescript
 * // Check if the 'colors' array contains the value of field 'selectedColor'
 * arrayContains(field("colors"), field("selectedColor"));
 * ```
 *
 * @param array - The array expression to check.
 * @param element - The element to search for in the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'array_contains' comparison.
 */
export declare function arrayContains(array: Expression, element: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if an array expression contains a specific element.
 *
 * @example
 * ```typescript
 * // Check if the 'colors' array contains "red"
 * arrayContains(field("colors"), "red");
 * ```
 *
 * @param array - The array expression to check.
 * @param element - The element to search for in the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'array_contains' comparison.
 */
export declare function arrayContains(array: Expression, element: unknown): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's array value contains a specific element.
 *
 * @example
 * ```typescript
 * // Check if the 'colors' array contains the value of field 'selectedColor'
 * arrayContains("colors", field("selectedColor"));
 * ```
 *
 * @param fieldName - The field name to check.
 * @param element - The element to search for in the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'array_contains' comparison.
 */
export declare function arrayContains(fieldName: string, element: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's array value contains a specific value.
 *
 * @example
 * ```typescript
 * // Check if the 'colors' array contains "red"
 * arrayContains("colors", "red");
 * ```
 *
 * @param fieldName - The field name to check.
 * @param element - The element to search for in the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'array_contains' comparison.
 */
export declare function arrayContains(fieldName: string, element: unknown): BooleanExpression;

/**
 *
 * Creates an expression that checks if an array expression contains all the specified elements.
 *
 * @example
 * ```typescript
 * // Check if the "tags" array contains all of the values: "SciFi", "Adventure", and the value from field "tag1"
 * arrayContainsAll(field("tags"), [field("tag1"), constant("SciFi"), "Adventure"]);
 * ```
 *
 * @param array - The array expression to check.
 * @param values - The elements to check for in the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'array_contains_all' comparison.
 */
export declare function arrayContainsAll(array: Expression, values: Array<Expression | unknown>): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's array value contains all the specified values or
 * expressions.
 *
 * @example
 * ```typescript
 * // Check if the 'tags' array contains both of the values from field 'tag1', the value "SciFi", and "Adventure"
 * arrayContainsAll("tags", [field("tag1"), "SciFi", "Adventure"]);
 * ```
 *
 * @param fieldName - The field name to check.
 * @param values - The elements to check for in the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'array_contains_all' comparison.
 */
export declare function arrayContainsAll(fieldName: string, values: Array<Expression | unknown>): BooleanExpression;

/**
 *
 * Creates an expression that checks if an array expression contains all the specified elements.
 *
 * @example
 * ```typescript
 * // Check if the "tags" array contains all of the values: "SciFi", "Adventure", and the value from field "tag1"
 * arrayContainsAll(field("tags"), [field("tag1"), constant("SciFi"), "Adventure"]);
 * ```
 *
 * @param array - The array expression to check.
 * @param arrayExpression - The elements to check for in the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'array_contains_all' comparison.
 */
export declare function arrayContainsAll(array: Expression, arrayExpression: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's array value contains all the specified values or
 * expressions.
 *
 * @example
 * ```typescript
 * // Check if the 'tags' array contains both of the values from field 'tag1', the value "SciFi", and "Adventure"
 * arrayContainsAll("tags", [field("tag1"), "SciFi", "Adventure"]);
 * ```
 *
 * @param fieldName - The field name to check.
 * @param arrayExpression - The elements to check for in the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'array_contains_all' comparison.
 */
export declare function arrayContainsAll(fieldName: string, arrayExpression: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if an array expression contains any of the specified
 * elements.
 *
 * @example
 * ```typescript
 * // Check if the 'categories' array contains either values from field "cate1" or "Science"
 * arrayContainsAny(field("categories"), [field("cate1"), "Science"]);
 * ```
 *
 * @param array - The array expression to check.
 * @param values - The elements to check for in the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'array_contains_any' comparison.
 */
export declare function arrayContainsAny(array: Expression, values: Array<Expression | unknown>): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's array value contains any of the specified
 * elements.
 *
 * @example
 * ```typescript
 * // Check if the 'groups' array contains either the value from the 'userGroup' field
 * // or the value "guest"
 * arrayContainsAny("categories", [field("cate1"), "Science"]);
 * ```
 *
 * @param fieldName - The field name to check.
 * @param values - The elements to check for in the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'array_contains_any' comparison.
 */
export declare function arrayContainsAny(fieldName: string, values: Array<Expression | unknown>): BooleanExpression;

/**
 *
 * Creates an expression that checks if an array expression contains any of the specified
 * elements.
 *
 * @example
 * ```typescript
 * // Check if the 'categories' array contains either values from field "cate1" or "Science"
 * arrayContainsAny(field("categories"), array([field("cate1"), "Science"]));
 * ```
 *
 * @param array - The array expression to check.
 * @param values - An expression that evaluates to an array, whose elements to check for in the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'array_contains_any' comparison.
 */
export declare function arrayContainsAny(array: Expression, values: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's array value contains any of the specified
 * elements.
 *
 * @example
 * ```typescript
 * // Check if the 'groups' array contains either the value from the 'userGroup' field
 * // or the value "guest"
 * arrayContainsAny("categories", array([field("cate1"), "Science"]));
 * ```
 *
 * @param fieldName - The field name to check.
 * @param values - An expression that evaluates to an array, whose elements to check for in the array field.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'array_contains_any' comparison.
 */
export declare function arrayContainsAny(fieldName: string, values: Expression): BooleanExpression;

/**
 *
 * Creates an expression that filters an array using a provided alias and predicate expression.
 *
 * @example
 * ```typescript
 * // Get a filtered array of the 'scores' field containing only elements greater than 50.
 * arrayFilter("scores", "score", greaterThan(variable("score"), 50));
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @param alias - The variable name to use for each element.
 * @param filter - The predicate boolean expression to evaluate for each element.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the filtered array.
 */
export declare function arrayFilter(fieldName: string, alias: string, filter: BooleanExpression): FunctionExpression;

/**
 * Creates an expression that filters an array using a provided alias and predicate expression.
 *
 * @example
 * ```typescript
 * // Filter "scores" to include only values greater than 50
 * arrayFilter(field("scores"), "score", greaterThan(variable("score"), 50));
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @param alias - The variable name to use for each element.
 * @param filter - The predicate boolean expression to filter by.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the filtered array.
 */
export declare function arrayFilter(arrayExpression: Expression, alias: string, filter: BooleanExpression): FunctionExpression;

/**
 * Creates an expression that returns the first element of an array.
 *
 * @example
 * ```typescript
 * // Get the first tag from the 'tags' array field
 * arrayFirst("tags");
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the first element.
 */
export declare function arrayFirst(fieldName: string): FunctionExpression;

/**
 *
 * Creates an expression that returns the first element of an array.
 *
 * @example
 * ```typescript
 * // Get the first tag from the 'tags' array field
 * arrayFirst(field("tags"));
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the first element.
 */
export declare function arrayFirst(arrayExpression: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the first `n` elements of an array.
 *
 * @example
 * ```typescript
 * // Get the first 3 tags from the 'tags' array field
 * arrayFirstN("tags", 3);
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @param n - The number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the first `n` elements.
 */
export declare function arrayFirstN(fieldName: string, n: number): FunctionExpression;

/**
 *
 * Creates an expression that returns the first `n` elements of an array.
 *
 * @example
 * ```typescript
 * // Get the first n tags from the 'tags' array field
 * arrayFirstN("tags", field("count"));
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @param n - An expression evaluating to the number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the first `n` elements.
 */
export declare function arrayFirstN(fieldName: string, n: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the first `n` elements of an array.
 *
 * @example
 * ```typescript
 * // Get the first 3 elements from an array expression
 * arrayFirstN(field("tags"), 3);
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @param n - The number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the first `n` elements.
 */
export declare function arrayFirstN(arrayExpression: Expression, n: number): FunctionExpression;

/**
 *
 * Creates an expression that returns the first `n` elements of an array.
 *
 * @example
 * ```typescript
 * // Get the first n elements from an array expression
 * arrayFirstN(field("tags"), field("count"));
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @param n - An expression evaluating to the number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the first `n` elements.
 */
export declare function arrayFirstN(arrayExpression: Expression, n: Expression): FunctionExpression;

/**
 * Creates an expression that indexes into an array from the beginning or end
 * and return the element. If the offset exceeds the array length, an error is
 * returned. A negative offset, starts from the end.
 *
 * @example
 * ```typescript
 * // Return the value in the tags field array at index 1.
 * arrayGet('tags', 1);
 * ```
 *
 * @param arrayField - The name of the array field.
 * @param offset - The index of the element to return.
 * @returns A new `Expression` representing the 'arrayGet' operation.
 */
export declare function arrayGet(arrayField: string, offset: number): FunctionExpression;

/**
 * Creates an expression that indexes into an array from the beginning or end
 * and return the element. If the offset exceeds the array length, an error is
 * returned. A negative offset, starts from the end.
 *
 * @example
 * ```typescript
 * // Return the value in the tags field array at index specified by field
 * // 'favoriteTag'.
 * arrayGet('tags', field('favoriteTag'));
 * ```
 *
 * @param arrayField - The name of the array field.
 * @param offsetExpr - An `Expression` evaluating to the index of the element to return.
 * @returns A new `Expression` representing the 'arrayGet' operation.
 */
export declare function arrayGet(arrayField: string, offsetExpr: Expression): FunctionExpression;

/**
 * Creates an expression that indexes into an array from the beginning or end
 * and return the element. If the offset exceeds the array length, an error is
 * returned. A negative offset, starts from the end.
 *
 * @example
 * ```typescript
 * // Return the value in the tags field array at index 1.
 * arrayGet(field('tags'), 1);
 * ```
 *
 * @param arrayExpression - An `Expression` evaluating to an array.
 * @param offset - The index of the element to return.
 * @returns A new `Expression` representing the 'arrayGet' operation.
 */
export declare function arrayGet(arrayExpression: Expression, offset: number): FunctionExpression;

/**
 * Creates an expression that indexes into an array from the beginning or end
 * and return the element. If the offset exceeds the array length, an error is
 * returned. A negative offset, starts from the end.
 *
 * @example
 * ```typescript
 * // Return the value in the tags field array at index specified by field
 * // 'favoriteTag'.
 * arrayGet(field('tags'), field('favoriteTag'));
 * ```
 *
 * @param arrayExpression - An `Expression` evaluating to an array.
 * @param offsetExpr - An `Expression` evaluating to the index of the element to return.
 * @returns A new `Expression` representing the 'arrayGet' operation.
 */
export declare function arrayGet(arrayExpression: Expression, offsetExpr: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the first index of the search value in an array.
 * Returns -1 if the value is not found.
 *
 * @example
 * ```typescript
 * // Get the index of "politics" in the 'tags' array field
 * arrayIndexOf("tags", "politics");
 * ```
 *
 * @param fieldName - The name of the field containing the array to search.
 * @param search - The value to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the index.
 */
export declare function arrayIndexOf(fieldName: string, search: unknown | Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the first index of the search value in an array.
 * Returns -1 if the value is not found.
 *
 * @example
 * ```typescript
 * // Get the index of "politics" in the 'tags' array field
 * arrayIndexOf(field("tags"), "politics");
 * ```
 *
 * @param arrayExpression - The expression representing the array to search.
 * @param search - The value to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the index.
 */
export declare function arrayIndexOf(arrayExpression: Expression, search: unknown | Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns all indices of the search value in an array.
 *
 * @example
 * ```typescript
 * // Get all indices of 5 in the 'scores' array field
 * arrayIndexOfAll("scores", 5);
 * ```
 *
 * @param fieldName - The name of the field containing the array to search.
 * @param search - The value to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the indices.
 */
export declare function arrayIndexOfAll(fieldName: string, search: unknown | Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns all indices of the search value in an array.
 *
 * @example
 * ```typescript
 * // Get all indices of 5 in the 'scores' array field
 * arrayIndexOfAll(field("scores"), 5);
 * ```
 *
 * @param arrayExpression - The expression representing the array to search.
 * @param search - The value to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the indices.
 */
export declare function arrayIndexOfAll(arrayExpression: Expression, search: unknown | Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the last element of an array.
 *
 * @example
 * ```typescript
 * // Get the last tag from the 'tags' array field
 * arrayLast("tags");
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the last element.
 */
export declare function arrayLast(fieldName: string): FunctionExpression;

/**
 *
 * Creates an expression that returns the last element of an array.
 *
 * @example
 * ```typescript
 * // Get the last tag from the 'tags' array field
 * arrayLast(field("tags"));
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the last element.
 */
export declare function arrayLast(arrayExpression: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the last index of the search value in an array.
 * Returns -1 if the value is not found.
 *
 * @example
 * ```typescript
 * // Get the last index of "politics" in the 'tags' array field
 * arrayLastIndexOf("tags", "politics");
 * ```
 *
 * @param fieldName - The name of the field containing the array to search.
 * @param search - The value to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the index.
 */
export declare function arrayLastIndexOf(fieldName: string, search: unknown | Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the last index of the search value in an array.
 * Returns -1 if the value is not found.
 *
 * @example
 * ```typescript
 * // Get the last index of "politics" in the 'tags' array field
 * arrayLastIndexOf(field("tags"), "politics");
 * ```
 *
 * @param arrayExpression - The expression representing the array to search.
 * @param search - The value to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the index.
 */
export declare function arrayLastIndexOf(arrayExpression: Expression, search: unknown | Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the last `n` elements of an array.
 *
 * @example
 * ```typescript
 * // Get the last 3 tags from the 'tags' array field
 * arrayLastN("tags", 3);
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @param n - The number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the last `n` elements.
 */
export declare function arrayLastN(fieldName: string, n: number): FunctionExpression;

/**
 *
 * Creates an expression that returns the last `n` elements of an array.
 *
 * @example
 * ```typescript
 * // Get the last n tags from the 'tags' array field
 * arrayLastN("tags", field("count"));
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @param n - An expression evaluating to the number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the last `n` elements.
 */
export declare function arrayLastN(fieldName: string, n: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the last `n` elements of an array.
 *
 * @example
 * ```typescript
 * // Get the last 3 elements from an array expression
 * arrayLastN(field("tags"), 3);
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @param n - The number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the last `n` elements.
 */
export declare function arrayLastN(arrayExpression: Expression, n: number): FunctionExpression;

/**
 *
 * Creates an expression that returns the last `n` elements of an array.
 *
 * @example
 * ```typescript
 * // Get the last n elements from an array expression
 * arrayLastN(field("tags"), field("count"));
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @param n - An expression evaluating to the number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the last `n` elements.
 */
export declare function arrayLastN(arrayExpression: Expression, n: Expression): FunctionExpression;

/**
 *
 * Creates an expression that calculates the length of an array in a specified field.
 *
 * @example
 * ```typescript
 * // Get the number of items in field 'cart'
 * arrayLength('cart');
 * ```
 *
 * @param fieldName - The name of the field containing an array to calculate the length of.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the length of the array.
 */
export declare function arrayLength(fieldName: string): FunctionExpression;

/**
 *
 * Creates an expression that calculates the length of an array expression.
 *
 * @example
 * ```typescript
 * // Get the number of items in the 'cart' array
 * arrayLength(field("cart"));
 * ```
 *
 * @param array - The array expression to calculate the length of.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the length of the array.
 */
export declare function arrayLength(array: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the maximum value in an array.
 *
 * @example
 * ```typescript
 * // Get the maximum value from the 'scores' array field
 * arrayMaximum("scores");
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the maximum value.
 */
export declare function arrayMaximum(fieldName: string): FunctionExpression;

/**
 *
 * Creates an expression that returns the maximum value in an array.
 *
 * @example
 * ```typescript
 * // Get the maximum value from the 'scores' array field
 * arrayMaximum(field("scores"));
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the maximum value.
 */
export declare function arrayMaximum(arrayExpression: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the largest `n` elements of an array.
 *
 * Note: Returns the n largest non-null elements in the array, in descending
 * order. This does not use a stable sort, meaning the order of equivalent
 * elements is undefined.
 *
 * @example
 * ```typescript
 * // Get the top 3 scores from the 'scores' array field
 * arrayMaximumN("scores", 3);
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @param n - The number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the largest `n` elements.
 */
export declare function arrayMaximumN(fieldName: string, n: number): FunctionExpression;

/**
 *
 * Creates an expression that returns the largest `n` elements of an array.
 *
 * Note: Returns the n largest non-null elements in the array, in descending
 * order. This does not use a stable sort, meaning the order of equivalent
 * elements is undefined.
 *
 * @example
 * ```typescript
 * // Get the top n scores from the 'scores' array field
 * arrayMaximumN("scores", field("count"));
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @param n - An expression evaluating to the number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the largest `n` elements.
 */
export declare function arrayMaximumN(fieldName: string, n: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the largest `n` elements of an array.
 *
 * Note: Returns the n largest non-null elements in the array, in descending
 * order. This does not use a stable sort, meaning the order of equivalent
 * elements is undefined.
 *
 * @example
 * ```typescript
 * // Get the top 3 elements from an array expression
 * arrayMaximumN(field("scores"), 3);
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @param n - The number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the largest `n` elements.
 */
export declare function arrayMaximumN(arrayExpression: Expression, n: number): FunctionExpression;

/**
 *
 * Creates an expression that returns the largest `n` elements of an array.
 *
 * Note: Returns the n largest non-null elements in the array, in descending
 * order. This does not use a stable sort, meaning the order of equivalent
 * elements is undefined.
 *
 * @example
 * ```typescript
 * // Get the top n elements from an array expression
 * arrayMaximumN(field("scores"), field("count"));
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @param n - An expression evaluating to the number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the largest `n` elements.
 */
export declare function arrayMaximumN(arrayExpression: Expression, n: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the minimum value in an array.
 *
 * @example
 * ```typescript
 * // Get the minimum value from the 'scores' array field
 * arrayMinimum("scores");
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the minimum value.
 */
export declare function arrayMinimum(fieldName: string): FunctionExpression;

/**
 *
 * Creates an expression that returns the minimum value in an array.
 *
 * @example
 * ```typescript
 * // Get the minimum value from the 'scores' array field
 * arrayMinimum(field("scores"));
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the minimum value.
 */
export declare function arrayMinimum(arrayExpression: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the smallest `n` elements of an array.
 *
 * Note: Returns the n smallest non-null elements in the array, in ascending
 * order. This does not use a stable sort, meaning the order of equivalent
 * elements is undefined.
 *
 * @example
 * ```typescript
 * // Get the bottom 3 scores from the 'scores' array field
 * arrayMinimumN("scores", 3);
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @param n - The number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the smallest `n` elements.
 */
export declare function arrayMinimumN(fieldName: string, n: number): FunctionExpression;

/**
 *
 * Creates an expression that returns the smallest `n` elements of an array.
 *
 * Note: Returns the n smallest non-null elements in the array, in ascending
 * order. This does not use a stable sort, meaning the order of equivalent
 * elements is undefined.
 *
 * @example
 * ```typescript
 * // Get the bottom n scores from the 'scores' array field
 * arrayMinimumN(field("scores"), field("count"));
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @param n - An expression evaluating to the number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the smallest `n` elements.
 */
export declare function arrayMinimumN(fieldName: string, n: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the smallest `n` elements of an array.
 *
 * Note: Returns the n smallest non-null elements in the array, in ascending
 * order. This does not use a stable sort, meaning the order of equivalent
 * elements is undefined.
 *
 * @example
 * ```typescript
 * // Get the bottom 3 scores from the 'scores' array field
 * arrayMinimumN(field("scores"), 3);
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @param n - The number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the smallest `n` elements.
 */
export declare function arrayMinimumN(arrayExpression: Expression, n: number): FunctionExpression;

/**
 *
 * Creates an expression that returns the smallest `n` elements of an array.
 *
 * Note: Returns the n smallest non-null elements in the array, in ascending
 * order. This does not use a stable sort, meaning the order of equivalent
 * elements is undefined.
 *
 * @example
 * ```typescript
 * // Get the bottom n scores from the 'scores' array field
 * arrayMinimumN(field("scores"), field("count"));
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @param n - An expression evaluating to the number of elements to return.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the smallest `n` elements.
 */
export declare function arrayMinimumN(arrayExpression: Expression, n: Expression): FunctionExpression;

/**
 * Creates an expression that returns a slice of an array from `offset` with `length` elements.
 *
 * @example
 * ```typescript
 * // Get 5 elements from the 'items' array field starting from index 2
 * arraySlice("items", 2, 5);
 *
 * // Get n elements from the 'items' array field starting from index 2
 * arraySlice("items", 2, field("length"));
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @param offset - The starting offset.
 * @param length - The optional length of the slice.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the sliced array.
 */
export declare function arraySlice(fieldName: string, offset: number | Expression, length?: number | Expression): FunctionExpression;

/**
 * Creates an expression that returns a slice of an array from `offset` with `length` elements.
 *
 * @example
 * ```typescript
 * // Get 5 elements from an array expression starting from index 2
 * arraySlice(field("items"), 2, 5);
 *
 * // Get n elements from an array expression starting from index 2
 * arraySlice(field("items"), 2, field("length"));
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @param offset - The starting offset.
 * @param length - The optional length of the slice.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the sliced array.
 */
export declare function arraySlice(arrayExpression: Expression, offset: number | Expression, length?: number | Expression): FunctionExpression;

/**
 * Creates an expression that computes the sum of the elements in an array.
 *
 * @example
 * ```typescript
 * // Compute the sum of the elements in the 'scores' field.
 * arraySum("scores");
 * ```
 *
 * @param fieldName - The name of the field to compute the sum of.
 * @returns A new `Expression` representing the sum of the elements in the array.
 */
export declare function arraySum(fieldName: string): FunctionExpression;

/**
 * Creates an expression that computes the sum of the elements in an array.
 *
 * @example
 * ```typescript
 * // Compute the sum of the elements in the 'scores' field.
 * arraySum(field("scores"));
 * ```
 *
 * @param expression - An expression evaluating to a numeric array, which the sum will be computed for.
 * @returns A new `Expression` representing the sum of the elements in the array.
 */
export declare function arraySum(expression: Expression): FunctionExpression;

/**
 * Creates an expression that applies a provided transformation to each element in an array.
 *
 * @example
 * ```typescript
 * // Transform "scores" array by multiplying each score by 10
 * arrayTransform(field("scores"), "score", multiply(variable("score"), 10));
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @param elementAlias - The variable name to use for each element.
 * @param transform - The lambda expression used to transform the elements.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the transformed array.
 */
export declare function arrayTransform(arrayExpression: Expression, elementAlias: string, transform: Expression): FunctionExpression;

/**
 * Creates an expression that applies a provided transformation to each element in an array.
 *
 * @example
 * ```typescript
 * // Transform "scores" array by multiplying each score by 10
 * arrayTransform("scores", "score", multiply(variable("score"), 10));
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @param elementAlias - The variable name to use for each element.
 * @param transform - The expression used to transform the elements.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the transformed array.
 */
export declare function arrayTransform(fieldName: string, elementAlias: string, transform: Expression): FunctionExpression;

/**
 * Creates an expression that applies a provided transformation to each element in an array, providing the element's index to the transformation expression.
 *
 * @example
 * ```typescript
 * // Transform "scores" array by adding the index to each score
 * arrayTransformWithIndex(field("scores"), "score", "i", add(variable("score"), variable("i")));
 * ```
 *
 * @param arrayExpression - The expression representing the array.
 * @param elementAlias - The variable name to use for each element.
 * @param indexAlias - The variable name to use for the current index.
 * @param transform - The expression used to transform the elements.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the transformed array.
 */
export declare function arrayTransformWithIndex(arrayExpression: Expression, elementAlias: string, indexAlias: string, transform: Expression): FunctionExpression;

/**
 * Creates an expression that applies a provided transformation to each element in an array, providing the element's index to the transformation expression.
 *
 * @example
 * ```typescript
 * // Transform "scores" array by adding the index to each score
 * arrayTransformWithIndex("scores", "score", "i", add(variable("score"), variable("i")));
 * ```
 *
 * @param fieldName - The name of the field containing the array.
 * @param elementAlias - The variable name to use for each element.
 * @param indexAlias - The variable name to use for the current index.
 * @param transform - The lambda expression used to transform the elements.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the transformed array.
 */
export declare function arrayTransformWithIndex(fieldName: string, elementAlias: string, indexAlias: string, transform: Expression): FunctionExpression;

/**
 *
 * Creates an {@link @firebase/firestore/pipelines#Ordering} that sorts documents in ascending order based on an expression.
 *
 * @example
 * ```typescript
 * // Sort documents by the 'name' field in lowercase in ascending order
 * firestore.pipeline().collection("users")
 *   .sort(ascending(field("name").toLower()));
 * ```
 *
 * @param expr - The expression to create an ascending ordering for.
 * @returns A new `Ordering` for ascending sorting.
 */
export declare function ascending(expr: Expression): Ordering;

/**
 *
 * Creates an {@link @firebase/firestore/pipelines#Ordering} that sorts documents in ascending order based on a field.
 *
 * @example
 * ```typescript
 * // Sort documents by the 'name' field in ascending order
 * firestore.pipeline().collection("users")
 *   .sort(ascending("name"));
 * ```
 *
 * @param fieldName - The field to create an ascending ordering for.
 * @returns A new `Ordering` for ascending sorting.
 */
export declare function ascending(fieldName: string): Ordering;

declare interface AsyncQueue {
    readonly isShuttingDown: boolean;
    /**
     * Adds a new operation to the queue without waiting for it to complete (i.e.
     * we ignore the Promise result).
     */
    enqueueAndForget<T extends unknown>(op: () => Promise<T>): void;
    /**
     * Regardless if the queue has initialized shutdown, adds a new operation to the
     * queue without waiting for it to complete (i.e. we ignore the Promise result).
     */
    enqueueAndForgetEvenWhileRestricted<T extends unknown>(op: () => Promise<T>): void;
    /**
     * Initialize the shutdown of this queue. Once this method is called, the
     * only possible way to request running an operation is through
     * `enqueueEvenWhileRestricted()`.
     *
     * @param purgeExistingTasks - Whether already enqueued tasked should be
     * rejected (unless enqueued with `enqueueEvenWhileRestricted()`). Defaults
     * to false.
     */
    enterRestrictedMode(purgeExistingTasks?: boolean): void;
    /**
     * Adds a new operation to the queue. Returns a promise that will be resolved
     * when the promise returned by the new operation is (with its value).
     */
    enqueue<T extends unknown>(op: () => Promise<T>): Promise<T>;
    /**
     * Enqueue a retryable operation.
     *
     * A retryable operation is rescheduled with backoff if it fails with a
     * IndexedDbTransactionError (the error type used by SimpleDb). All
     * retryable operations are executed in order and only run if all prior
     * operations were retried successfully.
     */
    enqueueRetryable(op: () => Promise<void>): void;
    /**
     * Schedules an operation to be queued on the AsyncQueue once the specified
     * `delayMs` has elapsed. The returned DelayedOperation can be used to cancel
     * or fast-forward the operation prior to its running.
     */
    enqueueAfterDelay<T extends unknown>(timerId: TimerId, delayMs: number, op: () => Promise<T>): DelayedOperation<T>;
    /**
     * Verifies there's an operation currently in-progress on the AsyncQueue.
     * Unfortunately we can't verify that the running code is in the promise chain
     * of that operation, so this isn't a foolproof check, but it should be enough
     * to catch some bugs.
     */
    verifyOperationInProgress(): void;
}

/**
 * @internal
 */
declare type AuthTokenFactory = () => string;

/**
 *
 * Creates an aggregation that calculates the average (mean) of values from an expression across
 * multiple stage inputs.
 *
 * @example
 * ```typescript
 * // Calculate the average age of users
 * average(field("age")).as("averageAge");
 * ```
 *
 * @param expression - The expression representing the values to average.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'average' aggregation.
 */
export declare function average(expression: Expression): AggregateFunction;

/**
 *
 * Creates an aggregation that calculates the average (mean) of a field's values across multiple
 * stage inputs.
 *
 * @example
 * ```typescript
 * // Calculate the average age of users
 * average("age").as("averageAge");
 * ```
 *
 * @param fieldName - The name of the field containing numeric values to average.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'average' aggregation.
 */
export declare function average(fieldName: string): AggregateFunction;

/**
 * Path represents an ordered sequence of string segments.
 */
declare abstract class BasePath<B extends BasePath<B>> {
    private segments;
    private offset;
    private len;
    constructor(segments: string[], offset?: number, length?: number);
    /**
     * Abstract constructor method to construct an instance of B with the given
     * parameters.
     */
    protected abstract construct(segments: string[], offset?: number, length?: number): B;
    /**
     * Returns a String representation.
     *
     * Implementing classes are required to provide deterministic implementations as
     * the String representation is used to obtain canonical Query IDs.
     */
    abstract toString(): string;
    get length(): number;
    isEqual(other: B): boolean;
    child(nameOrPath: string | B): B;
    /** The index of one past the last segment of the path. */
    private limit;
    popFirst(size?: number): B;
    popLast(): B;
    firstSegment(): string;
    lastSegment(): string;
    get(index: number): string;
    isEmpty(): boolean;
    isPrefixOf(other: this): boolean;
    isImmediateParentOf(potentialChild: this): boolean;
    forEach(fn: (segment: string) => void): void;
    toArray(): string[];
    /**
     * Compare 2 paths segment by segment, prioritizing numeric IDs
     * (e.g., "__id123__") in numeric ascending order, followed by string
     * segments in lexicographical order.
     */
    static comparator<T extends BasePath<T>>(p1: BasePath<T>, p2: BasePath<T>): number;
    private static compareSegments;
    private static isNumericId;
    private static extractNumericId;
}

/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * BatchID is a locally assigned ID for a batch of mutations that have been
 * applied.
 */
declare type BatchId = number;

/**
 *
 * An interface that represents a filter condition.
 */
export declare abstract class BooleanExpression extends Expression {
    abstract get _expr(): Expression;
    get _methodName(): string | undefined;
    /**
     * Creates an aggregation that finds the count of input documents satisfying
     * this boolean expression.
     *
     * @example
     * ```typescript
     * // Find the count of documents with a score greater than 90
     * field("score").greaterThan(90).countIf().as("highestScore");
     * ```
     *
     * @returns A new `AggregateFunction` representing the 'countIf' aggregation.
     */
    countIf(): AggregateFunction;
    /**
     * Creates an expression that negates this boolean expression.
     *
     * @example
     * ```typescript
     * // Find documents where the 'tags' field does not contain 'completed'
     * field("tags").arrayContains("completed").not();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the negated filter condition.
     */
    not(): BooleanExpression;
    /**
     * Creates a conditional expression that evaluates to the 'then' expression
     * if `this` expression evaluates to `true`,
     * or evaluates to the 'else' expression if `this` expressions evaluates `false`.
     *
     * @example
     * ```typescript
     * // If 'age' is greater than 18, return "Adult"; otherwise, return "Minor".
     * field("age").greaterThanOrEqual(18).conditional(constant("Adult"), constant("Minor"));
     * ```
     *
     * @param thenExpr - The expression to evaluate if the condition is true.
     * @param elseExpr - The expression to evaluate if the condition is false.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the conditional expression.
     */
    conditional(thenExpr: Expression, elseExpr: Expression): FunctionExpression;
    /**
     *
     * Creates an expression that returns the `catch` argument if there is an
     * error, else return the result of this expression.
     *
     * @example
     * ```typescript
     * // Create an expression that protects against a divide by zero error
     * // but always returns a boolean expression.
     * constant(50).divide(field('length')).greaterThan(1).ifError(constant(false));
     * ```
     *
     * @param catchValue - The value that will be returned if this expression
     * produces an error.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ifError' operation.
     */
    ifError(catchValue: BooleanExpression): BooleanExpression;
    /**
     *
     * Creates an expression that returns the `catch` argument if there is an
     * error, else return the result of this expression.
     *
     * @example
     * ```typescript
     * // Create an expression that protects against a divide by zero error
     * // but always returns a boolean expression.
     * constant(50).divide(field('length')).greaterThan(1).ifError(false);
     * ```
     *
     * @param catchValue - The value that will be returned if this expression
     * produces an error.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ifError' operation.
     */
    ifError(catchValue: boolean): BooleanExpression;
    /**
     *
     * Creates an expression that returns the `catch` argument if there is an
     * error, else return the result of this expression.
     *
     * @example
     * ```typescript
     * // Create an expression that protects against a divide by zero error.
     * constant(50).divide(field('length')).greaterThan(1).ifError(constant(0));
     * ```
     *
     * @param catchValue - The value that will be returned if this expression
     * produces an error.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ifError' operation.
     */
    ifError(catchValue: Expression): FunctionExpression;
    /**
     *
     * Creates an expression that returns the `catch` argument if there is an
     * error, else return the result of this expression.
     *
     * @example
     * ```typescript
     * // Create an expression that protects against a divide by zero error.
     * constant(50).divide(field('length')).greaterThan(1).ifError(0);
     * ```
     *
     * @param catchValue - The value that will be returned if this expression
     * produces an error.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ifError' operation.
     */
    ifError(catchValue: unknown): FunctionExpression;
    /**
     * @private
     * @internal
     */
    _toProto(serializer: JsonProtoSerializer): Value;
    /**
     * @private
     * @internal
     */
    _readUserData(context: ParseContext): void;
}

/**
 * Represents a bound of a query.
 *
 * The bound is specified with the given components representing a position and
 * whether it's just before or just after the position (relative to whatever the
 * query order is).
 *
 * The position represents a logical index position for a query. It's a prefix
 * of values for the (potentially implicit) order by clauses of a query.
 *
 * Bound provides a function to determine whether a document comes before or
 * after a bound. This is influenced by whether the position is just before or
 * just after the provided values.
 */
declare class Bound {
    readonly position: Value[];
    readonly inclusive: boolean;
    constructor(position: Value[], inclusive: boolean);
}

/**
 * Provides interfaces to save and read Firestore bundles.
 */
declare interface BundleCache {
    /**
     * Gets the saved `BundleMetadata` for a given `bundleId`, returns undefined
     * if no bundle metadata is found under the given id.
     */
    getBundleMetadata(transaction: PersistenceTransaction, bundleId: string): PersistencePromise<BundleMetadata | undefined>;
    /**
     * Saves a `BundleMetadata` from a bundle into local storage, using its id as
     * the persistent key.
     */
    saveBundleMetadata(transaction: PersistenceTransaction, metadata: BundleMetadata_2): PersistencePromise<void>;
    /**
     * Gets a saved `NamedQuery` for the given query name. Returns undefined if
     * no queries are found under the given name.
     */
    getNamedQuery(transaction: PersistenceTransaction, queryName: string): PersistencePromise<NamedQuery | undefined>;
    /**
     * Saves a `NamedQuery` from a bundle, using its name as the persistent key.
     */
    saveNamedQuery(transaction: PersistenceTransaction, query: NamedQuery_2): PersistencePromise<void>;
}

/** Properties of a BundledQuery. */
declare interface BundledQuery {
    /** BundledQuery parent */
    parent?: string | null;
    /** BundledQuery structuredQuery */
    structuredQuery?: StructuredQuery | null;
    /** BundledQuery limitType */
    limitType?: LimitType_2 | null;
}

/**
 * Represents a Firestore bundle saved by the SDK in its local storage.
 */
declare interface BundleMetadata {
    /**
     * Id of the bundle. It is used together with `createTime` to determine if a
     * bundle has been loaded by the SDK.
     */
    readonly id: string;
    /** Schema version of the bundle. */
    readonly version: number;
    /**
     * Set to the snapshot version of the bundle if created by the Server SDKs.
     * Otherwise set to SnapshotVersion.MIN.
     */
    readonly createTime: SnapshotVersion;
}

/** Properties of a BundleMetadata. */
declare interface BundleMetadata_2 {
    /** BundleMetadata id */
    id?: string | null;
    /** BundleMetadata createTime */
    createTime?: Timestamp_2 | null;
    /** BundleMetadata version */
    version?: number | null;
    /** BundleMetadata totalDocuments */
    totalDocuments?: number | null;
    /** BundleMetadata totalBytes */
    totalBytes?: number | null;
}

/**
 *
 * Creates an expression that calculates the byte length of a string in UTF-8, or just the length of a Blob.
 *
 * @example
 * ```typescript
 * // Calculate the length of the 'myString' field in bytes.
 * byteLength(field("myString"));
 * ```
 *
 * @param expr - The expression representing the string.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the length of the string in bytes.
 */
export declare function byteLength(expr: Expression): FunctionExpression;

/**
 *
 * Creates an expression that calculates the length of a string represented by a field in UTF-8 bytes, or just the length of a Blob.
 *
 * @example
 * ```typescript
 * // Calculate the length of the 'myString' field in bytes.
 * byteLength("myString");
 * ```
 *
 * @param fieldName - The name of the field containing the string.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the length of the string in bytes.
 */
export declare function byteLength(fieldName: string): FunctionExpression;

/**
 * An immutable object representing an array of bytes.
 */
export declare class Bytes {
    _byteString: ByteString;
    /** @hideconstructor */
    constructor(byteString: ByteString);
    /**
     * Creates a new `Bytes` object from the given Base64 string, converting it to
     * bytes.
     *
     * @param base64 - The Base64 string used to create the `Bytes` object.
     */
    static fromBase64String(base64: string): Bytes;
    /**
     * Creates a new `Bytes` object from the given Uint8Array.
     *
     * @param array - The Uint8Array used to create the `Bytes` object.
     */
    static fromUint8Array(array: Uint8Array): Bytes;
    /**
     * Returns the underlying bytes as a Base64-encoded string.
     *
     * @returns The Base64-encoded string created from the `Bytes` object.
     */
    toBase64(): string;
    /**
     * Returns the underlying bytes in a new `Uint8Array`.
     *
     * @returns The Uint8Array created from the `Bytes` object.
     */
    toUint8Array(): Uint8Array;
    /**
     * Returns a string representation of the `Bytes` object.
     *
     * @returns A string representation of the `Bytes` object.
     */
    toString(): string;
    /**
     * Returns true if this `Bytes` object is equal to the provided one.
     *
     * @param other - The `Bytes` object to compare against.
     * @returns true if this `Bytes` object is equal to the provided one.
     */
    isEqual(other: Bytes): boolean;
    static _jsonSchemaVersion: string;
    static _jsonSchema: {
        type: Property<"string">;
        bytes: Property<"string">;
    };
    /**
     * Returns a JSON-serializable representation of this `Bytes` instance.
     *
     * @returns a JSON representation of this object.
     */
    toJSON(): object;
    /**
     * Builds a `Bytes` instance from a JSON object created by {@link Bytes.toJSON}.
     *
     * @param json - a JSON object represention of a `Bytes` instance
     * @returns an instance of {@link Bytes} if the JSON object could be parsed. Throws a
     * {@link FirestoreError} if an error occurs.
     */
    static fromJSON(json: object): Bytes;
}

/**
 * @license
 * Copyright 2020 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Immutable class that represents a "proto" byte string.
 *
 * Proto byte strings can either be Base64-encoded strings or Uint8Arrays when
 * sent on the wire. This class abstracts away this differentiation by holding
 * the proto byte string in a common class that must be converted into a string
 * before being sent as a proto.
 * @internal
 */
declare class ByteString {
    private readonly binaryString;
    static readonly EMPTY_BYTE_STRING: ByteString;
    private constructor();
    static fromBase64String(base64: string): ByteString;
    static fromUint8Array(array: Uint8Array): ByteString;
    [Symbol.iterator](): Iterator<number>;
    toBase64(): string;
    toUint8Array(): Uint8Array;
    approximateByteSize(): number;
    compareTo(other: ByteString): number;
    isEqual(other: ByteString): boolean;
}

/**
 * Creates an expression that computes the ceiling of a numeric value.
 *
 * @example
 * ```typescript
 * // Compute the ceiling of the 'price' field.
 * ceil("price");
 * ```
 *
 * @param fieldName - The name of the field to compute the ceiling of.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the ceiling of the numeric value.
 */
export declare function ceil(fieldName: string): FunctionExpression;

/**
 * Creates an expression that computes the ceiling of a numeric value.
 *
 * @example
 * ```typescript
 * // Compute the ceiling of the 'price' field.
 * ceil(field("price"));
 * ```
 *
 * @param expression - An expression evaluating to a numeric value, which the ceiling will be computed for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the ceiling of the numeric value.
 */
export declare function ceil(expression: Expression): FunctionExpression;

declare const enum ChangeType {
    Added = 0,
    Removed = 1,
    Modified = 2,
    Metadata = 3
}

/**
 *
 * Creates an expression that calculates the character length of a string field in UTF8.
 *
 * @example
 * ```typescript
 * // Get the character length of the 'name' field in UTF-8.
 * charLength("name");
 * ```
 *
 * @param fieldName - The name of the field containing the string.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the length of the string.
 */
export declare function charLength(fieldName: string): FunctionExpression;

/**
 *
 * Creates an expression that calculates the character length of a string expression in UTF-8.
 *
 * @example
 * ```typescript
 * // Get the character length of the 'name' field in UTF-8.
 * charLength(field("name"));
 * ```
 *
 * @param stringExpression - The expression representing the string to calculate the length of.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the length of the string.
 */
export declare function charLength(stringExpression: Expression): FunctionExpression;

/**
 * A randomly-generated key assigned to each Firestore instance at startup.
 */
declare type ClientId = string;

/**
 * Creates an expression that returns the first non-null, non-absent argument, without evaluating
 * the rest of the arguments. When all arguments are null or absent, returns the last argument.
 *
 * @example
 * ```typescript
 * // Returns the value of the first non-null, non-absent field among 'preferredName', 'fullName',
 * // or the last argument if all previous fields are null.
 * coalesce(field("preferredName"), field("fullName"), constant("Anonymous"))
 * ```
 *
 * @param expression - The first expression to check for null.
 * @param replacement - The fallback expression or value if the first one is null.
 * @param others - Optional additional expressions to check if previous ones are null.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the coalesce operation.
 */
export declare function coalesce(expression: Expression, replacement: Expression | unknown, ...others: Array<Expression | unknown>): FunctionExpression;

/**
 * Creates an expression that returns the first non-null, non-absent argument, without evaluating
 * the rest of the arguments. When all arguments are null or absent, returns the last argument.
 *
 * @example
 * ```typescript
 * // Returns the value of the first non-null, non-absent field among 'preferredName', 'fullName',
 * // or the last argument if all previous fields are null.
 * coalesce("preferredName", field("fullName"), constant("Anonymous"))
 * ```
 *
 * @param fieldName - The name of the first field to check for null.
 * @param replacement - The fallback expression or value if the first one is null.
 * @param others - Optional additional expressions to check if previous ones are null.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the coalesce operation.
 */
export declare function coalesce(fieldName: string, replacement: Expression | unknown, ...others: Array<Expression | unknown>): FunctionExpression;

/**
 * Defines the configuration options for a CollectionGroupStage within a pipeline.
 * This type extends {@link @firebase/firestore/pipelines#StageOptions} and provides specific settings for how a collection group
 * is identified and processed during pipeline execution.
 *
 * See {@link @firebase/firestore/pipelines#PipelineSource.(collectionGroup:1)} to create a collection group stage.
 */
export declare type CollectionGroupStageOptions = StageOptions & {
    /**
     * ID of the collection group to use as the Pipeline source.
     */
    collectionId: string;
    /**
     * Specifies the name of an index to be used for a query, overriding the query optimizer's default choice.
     * This can be useful for performance tuning in specific scenarios where the default index selection
     * does not yield optimal performance.
     *
     * @remarks This property is optional. When provided, it should be the exact name of the index to force.
     */
    forceIndex?: string;
};

/**
 * Creates an expression that returns the collection ID from a path.
 *
 * @example
 * ```typescript
 * // Get the collection ID from a path.
 * collectionId("__name__");
 * ```
 *
 * @param fieldName - The name of the field to get the collection ID from.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the collectionId operation.
 */
export declare function collectionId(fieldName: string): FunctionExpression;

/**
 * Creates an expression that returns the collection ID from a path.
 *
 * @example
 * ```typescript
 * // Get the collection ID from a path.
 * collectionId(field("__name__"));
 * ```
 *
 * @param expression - An expression evaluating to a path, which the collection ID will be extracted from.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the collectionId operation.
 */
export declare function collectionId(expression: Expression): FunctionExpression;

/**
 * A `CollectionReference` object can be used for adding documents, getting
 * document references, and querying for documents (using {@link (query:1)}).
 */
declare class CollectionReference<AppModelType = DocumentData, DbModelType extends DocumentData = DocumentData> extends Query<AppModelType, DbModelType> {
    readonly _path: ResourcePath;
    /** The type of this Firestore reference. */
    readonly type = "collection";
    /** @hideconstructor */
    constructor(firestore: Firestore_2, converter: FirestoreDataConverter_2<AppModelType, DbModelType> | null, _path: ResourcePath);
    /** The collection's identifier. */
    get id(): string;
    /**
     * A string representing the path of the referenced collection (relative
     * to the root of the database).
     */
    get path(): string;
    /**
     * A reference to the containing `DocumentReference` if this is a
     * subcollection. If this isn't a subcollection, the reference is null.
     */
    get parent(): DocumentReference<DocumentData, DocumentData> | null;
    /**
     * Applies a custom data converter to this `CollectionReference`, allowing you
     * to use your own custom model objects with Firestore. When you call {@link
     * addDoc} with the returned `CollectionReference` instance, the provided
     * converter will convert between Firestore data of type `NewDbModelType` and
     * your custom type `NewAppModelType`.
     *
     * @param converter - Converts objects to and from Firestore.
     * @returns A `CollectionReference` that uses the provided converter.
     */
    withConverter<NewAppModelType, NewDbModelType extends DocumentData = DocumentData>(converter: FirestoreDataConverter_2<NewAppModelType, NewDbModelType>): CollectionReference<NewAppModelType, NewDbModelType>;
    /**
     * Removes the current converter.
     *
     * @param converter - `null` removes the current converter.
     * @returns A `CollectionReference<DocumentData, DocumentData>` that does not
     * use a converter.
     */
    withConverter(converter: null): CollectionReference<DocumentData, DocumentData>;
}

/**
 * Options defining how a CollectionStage is evaluated. See {@link @firebase/firestore/pipelines#PipelineSource.(collection:1)}.
 */
export declare type CollectionStageOptions = StageOptions & {
    /**
     * Name or reference to the collection that will be used as the Pipeline source.
     */
    collection: string | CollectionReference;
    /**
     * Specifies the name of an index to be used for a query, overriding the query optimizer's default choice.
     * This can be useful for performance tuning in specific scenarios where the default index selection
     * does not yield optimal performance.
     *
     * @remarks This property is optional. When provided, it should be the exact name of the index to force.
     */
    forceIndex?: string;
};

/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
declare type Comparator<K> = (key1: K, key2: K) => number;

declare interface ComponentConfiguration {
    asyncQueue: AsyncQueue;
    databaseInfo: DatabaseInfo;
    authCredentials: CredentialsProvider<User>;
    appCheckCredentials: CredentialsProvider<string>;
    clientId: ClientId;
    initialUser: User;
    maxConcurrentLimboResolutions: number;
}

declare type CompositeFilterOp = 'OPERATOR_UNSPECIFIED' | 'AND' | 'OR';

/**
 * Creates an expression that concatenates strings, arrays, or blobs. Types cannot be mixed.
 *
 * @example
 * ```typescript
 * // Concatenate the 'firstName' and 'lastName' fields with a space in between.
 * concat(field("firstName"), " ", field("lastName"))
 * ```
 *
 * @param first - The first expressions to concatenate.
 * @param second - The second literal or expression to concatenate.
 * @param others - Additional literals or expressions to concatenate.
 * @returns A new `Expression` representing the concatenation.
 */
export declare function concat(first: Expression, second: Expression | unknown, ...others: Array<Expression | unknown>): FunctionExpression;

/**
 * Creates an expression that concatenates strings, arrays, or blobs. Types cannot be mixed.
 *
 * @example
 * ```typescript
 * // Concatenate a field with a literal string.
 * concat(field("firstName"), "Doe")
 * ```
 *
 * @param fieldName - The name of a field to concatenate.
 * @param second - The second literal or expression to concatenate.
 * @param others - Additional literal or expressions to concatenate.
 * @returns A new `Expression` representing the concatenation.
 */
export declare function concat(fieldName: string, second: Expression | unknown, ...others: Array<Expression | unknown>): FunctionExpression;

/**
 *
 * Creates a conditional expression that evaluates to a 'then' expression if a condition is true
 * and an 'else' expression if the condition is false.
 *
 * @example
 * ```typescript
 * // If 'age' is greater than 18, return "Adult"; otherwise, return "Minor".
 * conditional(
 *     greaterThan("age", 18), constant("Adult"), constant("Minor"));
 * ```
 *
 * @param condition - The condition to evaluate.
 * @param thenExpr - The expression to evaluate if the condition is true.
 * @param elseExpr - The expression to evaluate if the condition is false.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the conditional expression.
 */
export declare function conditional(condition: BooleanExpression, thenExpr: Expression, elseExpr: Expression): FunctionExpression;

/**
 * Creates a `Constant` instance for a number value.
 *
 * @param value - The number value.
 * @returns A new `Constant` instance.
 */
export declare function constant(value: number, options?: {
    preferIntegers?: boolean;
}): Expression;

/**
 * Creates a `Constant` instance for a string value.
 *
 * @param value - The string value.
 * @returns A new `Constant` instance.
 */
export declare function constant(value: string): Expression;

/**
 * Creates a `BooleanExpression` instance for a boolean value.
 *
 * @param value - The boolean value.
 * @returns A new `Constant` instance.
 */
export declare function constant(value: boolean): BooleanExpression;

/**
 * Creates a `Constant` instance for a null value.
 *
 * @param value - The null value.
 * @returns A new `Constant` instance.
 */
export declare function constant(value: null): Expression;

/**
 * Creates a `Constant` instance for a GeoPoint value.
 *
 * @param value - The GeoPoint value.
 * @returns A new `Constant` instance.
 */
export declare function constant(value: GeoPoint): Expression;

/**
 * Creates a `Constant` instance for a Timestamp value.
 *
 * @param value - The Timestamp value.
 * @returns A new `Constant` instance.
 */
export declare function constant(value: Timestamp): Expression;

/**
 * Creates a `Constant` instance for a Date value.
 *
 * @param value - The Date value.
 * @returns A new `Constant` instance.
 */
export declare function constant(value: Date): Expression;

/**
 * Creates a `Constant` instance for a Bytes value.
 *
 * @param value - The Bytes value.
 * @returns A new `Constant` instance.
 */
export declare function constant(value: Bytes): Expression;

/**
 * Creates a `Constant` instance for a DocumentReference value.
 *
 * @param value - The DocumentReference value.
 * @returns A new `Constant` instance.
 */
export declare function constant(value: DocumentReference): Expression;

/**
 * Creates a `Constant` instance for a Firestore proto value.
 * For internal use only.
 * @private
 * @internal
 * @param value - The Firestore proto value.
 * @returns A new `Constant` instance.
 */
export declare function constant(value: Value): Expression;

/**
 * Creates a `Constant` instance for a VectorValue value.
 *
 * @param value - The VectorValue value.
 * @returns A new `Constant` instance.
 */
export declare function constant(value: VectorValue): Expression;

/** Contains the settings that are mutated as we parse user data. */
declare interface ContextSettings {
    /** Indicates what kind of API method this data came from. */
    readonly dataSource: UserDataSource;
    /** The name of the method the user called to create the ParseContext. */
    readonly methodName: string;
    /** The document the user is attempting to modify, if that applies. */
    readonly targetDoc?: DocumentKey;
    /**
     * A path within the object being parsed. This could be an empty path (in
     * which case the context represents the root of the data being parsed), or a
     * nonempty path (indicating the context represents a nested location within
     * the data).
     */
    readonly path?: FieldPath_2;
    /**
     * Whether or not this context corresponds to an element of an array.
     * If not set, elements are treated as if they were outside of arrays.
     */
    readonly arrayElement?: boolean;
    /**
     * Whether or not a converter was specified in this context. If true, error
     * messages will reference the converter when invalid data is provided.
     */
    readonly hasConverter?: boolean;
}

declare class CorePipeline {
    readonly serializer: JsonProtoSerializer;
    readonly stages: Stage[];
    readonly listenOptions?: ListenOptions | undefined;
    isCorePipeline: boolean;
    constructor(serializer: JsonProtoSerializer, stages: Stage[], listenOptions?: ListenOptions | undefined);
    getPipelineCollection(): string | undefined;
    getPipelineCollectionGroup(): string | undefined;
    getPipelineCollectionId(): string | undefined;
    getPipelineDocuments(): string[] | undefined;
    getPipelineFlavor(): PipelineFlavor;
    getPipelineSourceType(): PipelineSourceType | 'unknown';
}

/**
 *
 * Calculates the Cosine distance between a field's vector value and a literal vector value.
 *
 * @example
 * ```typescript
 * // Calculate the Cosine distance between the 'location' field and a target location
 * cosineDistance("location", [37.7749, -122.4194]);
 * ```
 *
 * @param fieldName - The name of the field containing the first vector.
 * @param vector - The other vector (as an array of doubles) or {@link VectorValue} to compare against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the Cosine distance between the two vectors.
 */
export declare function cosineDistance(fieldName: string, vector: number[] | VectorValue): FunctionExpression;

/**
 *
 * Calculates the Cosine distance between a field's vector value and a vector expression.
 *
 * @example
 * ```typescript
 * // Calculate the cosine distance between the 'userVector' field and the 'itemVector' field
 * cosineDistance("userVector", field("itemVector"));
 * ```
 *
 * @param fieldName - The name of the field containing the first vector.
 * @param vectorExpression - The other vector (represented as an `Expression`) to compare against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the cosine distance between the two vectors.
 */
export declare function cosineDistance(fieldName: string, vectorExpression: Expression): FunctionExpression;

/**
 *
 * Calculates the Cosine distance between a vector expression and a vector literal.
 *
 * @example
 * ```typescript
 * // Calculate the cosine distance between the 'location' field and a target location
 * cosineDistance(field("location"), [37.7749, -122.4194]);
 * ```
 *
 * @param vectorExpression - The first vector (represented as an `Expression`) to compare against.
 * @param vector - The other vector (as an array of doubles or VectorValue) to compare against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the cosine distance between the two vectors.
 */
export declare function cosineDistance(vectorExpression: Expression, vector: number[] | VectorValue): FunctionExpression;

/**
 *
 * Calculates the Cosine distance between two vector expressions.
 *
 * @example
 * ```typescript
 * // Calculate the cosine distance between the 'userVector' field and the 'itemVector' field
 * cosineDistance(field("userVector"), field("itemVector"));
 * ```
 *
 * @param vectorExpression - The first vector (represented as an `Expression`) to compare against.
 * @param otherVectorExpression - The other vector (represented as an `Expression`) to compare against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the cosine distance between the two vectors.
 */
export declare function cosineDistance(vectorExpression: Expression, otherVectorExpression: Expression): FunctionExpression;

/**
 *
 * Creates an aggregation that counts the number of stage inputs with valid evaluations of the
 * provided expression.
 *
 * @example
 * ```typescript
 * // Count the number of items where the price is greater than 10
 * count(field("price").greaterThan(10)).as("expensiveItemCount");
 * ```
 *
 * @param expression - The expression to count.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'count' aggregation.
 */
export declare function count(expression: Expression): AggregateFunction;

/**
 * Creates an aggregation that counts the number of stage inputs where the input field exists.
 *
 * @example
 * ```typescript
 * // Count the total number of products
 * count("productId").as("totalProducts");
 * ```
 *
 * @param fieldName - The name of the field to count.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'count' aggregation.
 */
export declare function count(fieldName: string): AggregateFunction;

/**
 * Creates an aggregation that counts the total number of stage inputs.
 *
 * @example
 * ```typescript
 * // Count the total number of input documents
 * countAll().as("totalDocument");
 * ```
 *
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'countAll' aggregation.
 */
export declare function countAll(): AggregateFunction;

/**
 * Creates an aggregation that counts the number of distinct values of a field.
 *
 * @param expr - The expression or field to count distinct values of.
 * @returns A new `AggregateFunction` representing the 'count_distinct' aggregation.
 */
export declare function countDistinct(expr: Expression | string): AggregateFunction;

/**
 * Creates an aggregation that counts the number of stage inputs where the provided
 * boolean expression evaluates to true.
 *
 * @example
 * ```typescript
 * // Count the number of documents where 'is_active' field equals true
 * countIf(field("is_active").equal(true)).as("numActiveDocuments");
 * ```
 *
 * @param booleanExpr - The boolean expression to evaluate on each input.
 * @returns A new `AggregateFunction` representing the 'countIf' aggregation.
 */
export declare function countIf(booleanExpr: BooleanExpression): AggregateFunction;

/**
 * A Listener for credential change events. The listener should fetch a new
 * token and may need to invalidate other state if the current user has also
 * changed.
 */
declare type CredentialChangeListener<T> = (credential: T) => Promise<void>;

/**
 * Provides methods for getting the uid and token for the current user and
 * listening for changes.
 */
declare interface CredentialsProvider<T> {
    /**
     * Starts the credentials provider and specifies a listener to be notified of
     * credential changes (sign-in / sign-out, token changes). It is immediately
     * called once with the initial user.
     *
     * The change listener is invoked on the provided AsyncQueue.
     */
    start(asyncQueue: AsyncQueue, changeListener: CredentialChangeListener<T>): void;
    /** Requests a token for the current user. */
    getToken(): Promise<Token | null>;
    /**
     * Marks the last retrieved token as invalid, making the next GetToken request
     * force-refresh the token.
     */
    invalidateToken(): void;
    shutdown(): void;
}

/** Settings for private credentials */
declare type CredentialsSettings = FirstPartyCredentialsSettings | ProviderCredentialsSettings;

/**
 * @public
 * Creates an expression that represents the current document being processed.
 *
 * @example
 * ```typescript
 * // Define the current document as a variable "doc"
 * firestore.pipeline().collection("books")
 *     .define(currentDocument().as("doc"))
 *     // Access a field from the defined document variable
 *     .select(variable("doc").mapGet("title"));
 * ```
 *
 * @returns An {@link @firebase/firestore/pipelines#Expression} representing the current document.
 */
export declare function currentDocument(): Expression;

/**
 *
 * Creates an expression that evaluates to the current server timestamp.
 *
 * @example
 * ```typescript
 * // Get the current server timestamp
 * currentTimestamp()
 * ```
 *
 * @returns A new Expression representing the current server timestamp.
 */
export declare function currentTimestamp(): FunctionExpression;

/**
 * Represents the database ID a Firestore client is associated with.
 * @internal
 */
declare class DatabaseId {
    readonly projectId: string;
    readonly database: string;
    constructor(projectId: string, database?: string);
    static empty(): DatabaseId;
    get isDefaultDatabase(): boolean;
    isEqual(other: {}): boolean;
}

/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
declare class DatabaseInfo {
    readonly databaseId: DatabaseId;
    readonly appId: string;
    readonly persistenceKey: string;
    readonly host: string;
    readonly ssl: boolean;
    readonly forceLongPolling: boolean;
    readonly autoDetectLongPolling: boolean;
    readonly longPollingOptions: ExperimentalLongPollingOptions;
    readonly useFetchStreams: boolean;
    readonly isUsingEmulator: boolean;
    readonly apiKey: string | undefined;
    readonly _customHeaders?: Record<string, string> | undefined;
    readonly grpcFlowControlWindow?: number | undefined;
    /**
     * Constructs a DatabaseInfo using the provided host, databaseId and
     * persistenceKey.
     *
     * @param databaseId - The database to use.
     * @param appId - The Firebase App Id.
     * @param persistenceKey - A unique identifier for this Firestore's local
     * storage (used in conjunction with the databaseId).
     * @param host - The Firestore backend host to connect to.
     * @param ssl - Whether to use SSL when connecting.
     * @param forceLongPolling - Whether to use the forceLongPolling option
     * when using WebChannel as the network transport.
     * @param autoDetectLongPolling - Whether to use the detectBufferingProxy
     * option when using WebChannel as the network transport.
     * @param longPollingOptions - Options that configure long-polling.
     * @param useFetchStreams - Whether to use the Fetch API instead of
     * XMLHTTPRequest
     */
    constructor(databaseId: DatabaseId, appId: string, persistenceKey: string, host: string, ssl: boolean, forceLongPolling: boolean, autoDetectLongPolling: boolean, longPollingOptions: ExperimentalLongPollingOptions, useFetchStreams: boolean, isUsingEmulator: boolean, apiKey: string | undefined, _customHeaders?: Record<string, string> | undefined, grpcFlowControlWindow?: number | undefined);
}

/**
 * Options defining how a DatabaseStage is evaluated. See {@link @firebase/firestore/pipelines#PipelineSource.(database:1)}.
 */
export declare type DatabaseStageOptions = StageOptions & {};

/**
 * Datastore and its related methods are a wrapper around the external Google
 * Cloud Datastore grpc API, which provides an interface that is more convenient
 * for the rest of the client SDK architecture to consume.
 */
declare abstract class Datastore {
    abstract terminate(): void;
    abstract serializer: JsonProtoSerializer;
}

/**
 * @public
 * Options defining how a DefineStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(define:1)}.
 */
export declare type DefineStageOptions = StageOptions & {
    /**
     * @public
     * The variables to define.
     */
    variables: AliasedExpression[];
};

/**
 * Represents an operation scheduled to be run in the future on an AsyncQueue.
 *
 * It is created via DelayedOperation.createAndSchedule().
 *
 * Supports cancellation (via cancel()) and early execution (via skipDelay()).
 *
 * Note: We implement `PromiseLike` instead of `Promise`, as the `Promise` type
 * in newer versions of TypeScript defines `finally`, which is not available in
 * IE.
 */
declare class DelayedOperation<T extends unknown> implements PromiseLike<T> {
    private readonly asyncQueue;
    readonly timerId: TimerId;
    readonly targetTimeMs: number;
    private readonly op;
    private readonly removalCallback;
    private timerHandle;
    private readonly deferred;
    private constructor();
    get promise(): Promise<T>;
    /**
     * Creates and returns a DelayedOperation that has been scheduled to be
     * executed on the provided asyncQueue after the provided delayMs.
     *
     * @param asyncQueue - The queue to schedule the operation on.
     * @param id - A Timer ID identifying the type of operation this is.
     * @param delayMs - The delay (ms) before the operation should be scheduled.
     * @param op - The operation to run.
     * @param removalCallback - A callback to be called synchronously once the
     *   operation is executed or canceled, notifying the AsyncQueue to remove it
     *   from its delayedOperations list.
     *   PORTING NOTE: This exists to prevent making removeDelayedOperation() and
     *   the DelayedOperation class public.
     */
    static createAndSchedule<R extends unknown>(asyncQueue: AsyncQueue, timerId: TimerId, delayMs: number, op: () => Promise<R>, removalCallback: (op: DelayedOperation<R>) => void): DelayedOperation<R>;
    /**
     * Starts the timer. This is called immediately after construction by
     * createAndSchedule().
     */
    private start;
    /**
     * Queues the operation to run immediately (if it hasn't already been run or
     * canceled).
     */
    skipDelay(): void;
    /**
     * Cancels the operation if it hasn't already been executed or canceled. The
     * promise will be rejected.
     *
     * As long as the operation has not yet been run, calling cancel() provides a
     * guarantee that the operation will not be run.
     */
    cancel(reason?: string): void;
    then: <TResult1 = T, TResult2 = never>(onfulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | null | undefined, onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | null | undefined) => Promise<TResult1 | TResult2>;
    private handleDelayElapsed;
    private clearTimeout;
}

/**
 *
 * Creates an {@link @firebase/firestore/pipelines#Ordering} that sorts documents in descending order based on an expression.
 *
 * @example
 * ```typescript
 * // Sort documents by the 'name' field in lowercase in descending order
 * firestore.pipeline().collection("users")
 *   .sort(descending(field("name").toLower()));
 * ```
 *
 * @param expr - The expression to create a descending ordering for.
 * @returns A new `Ordering` for descending sorting.
 */
export declare function descending(expr: Expression): Ordering;

/**
 *
 * Creates an {@link @firebase/firestore/pipelines#Ordering} that sorts documents in descending order based on a field.
 *
 * @example
 * ```typescript
 * // Sort documents by the 'name' field in descending order
 * firestore.pipeline().collection("users")
 *   .sort(descending("name"));
 * ```
 *
 * @param fieldName - The field to create a descending ordering for.
 * @returns A new `Ordering` for descending sorting.
 */
export declare function descending(fieldName: string): Ordering;

/**
 * The direction of sorting in an order by.
 */
declare const enum Direction {
    ASCENDING = "asc",
    DESCENDING = "desc"
}

/**
 * Options defining how a DistinctStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(distinct:1)}.
 */
export declare type DistinctStageOptions = StageOptions & {
    /**
     * The {@link @firebase/firestore/pipelines#Selectable} expressions or field names to consider when determining
     * distinct value combinations (groups).
     */
    groups: Array<string | Selectable>;
};

/**
 *
 * Creates an expression that divides two expressions.
 *
 * @example
 * ```typescript
 * // Divide the 'total' field by the 'count' field
 * divide(field("total"), field("count"));
 * ```
 *
 * @param left - The expression to be divided.
 * @param right - The expression to divide by.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the division operation.
 */
export declare function divide(left: Expression, right: Expression): FunctionExpression;

/**
 *
 * Creates an expression that divides an expression by a constant value.
 *
 * @example
 * ```typescript
 * // Divide the 'value' field by 10
 * divide(field("value"), 10);
 * ```
 *
 * @param expression - The expression to be divided.
 * @param value - The constant value to divide by.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the division operation.
 */
export declare function divide(expression: Expression, value: unknown): FunctionExpression;

/**
 *
 * Creates an expression that divides a field's value by an expression.
 *
 * @example
 * ```typescript
 * // Divide the 'total' field by the 'count' field
 * divide("total", field("count"));
 * ```
 *
 * @param fieldName - The field name to be divided.
 * @param expressions - The expression to divide by.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the division operation.
 */
export declare function divide(fieldName: string, expressions: Expression): FunctionExpression;

/**
 *
 * Creates an expression that divides a field's value by a constant value.
 *
 * @example
 * ```typescript
 * // Divide the 'value' field by 10
 * divide("value", 10);
 * ```
 *
 * @param fieldName - The field name to be divided.
 * @param value - The constant value to divide by.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the division operation.
 */
export declare function divide(fieldName: string, value: unknown): FunctionExpression;

/**
 * Represents a document in Firestore with a key, version, data and whether the
 * data has local mutations applied to it.
 */
declare interface Document_2 {
    /** The key for this document */
    readonly key: DocumentKey;
    /**
     * The version of this document if it exists or a version at which this
     * document was guaranteed to not exist.
     */
    readonly version: SnapshotVersion;
    /**
     * The timestamp at which this document was read from the remote server. Uses
     * `SnapshotVersion.min()` for documents created by the user.
     */
    readonly readTime: SnapshotVersion;
    /**
     * The timestamp at which the document was created. This value increases
     * monotonically when a document is deleted then recreated. It can also be
     * compared to `createTime` of other documents and the `readTime` of a query.
     */
    readonly createTime: SnapshotVersion;
    /** The underlying data of this document or an empty value if no data exists. */
    readonly data: ObjectValue;
    /** Returns whether local mutations were applied via the mutation queue. */
    readonly hasLocalMutations: boolean;
    /** Returns whether mutations were applied based on a write acknowledgment. */
    readonly hasCommittedMutations: boolean;
    /**
     * Whether this document had a local mutation applied that has not yet been
     * acknowledged by Watch.
     */
    readonly hasPendingWrites: boolean;
    /**
     * Returns whether this document is valid (i.e. it is an entry in the
     * RemoteDocumentCache, was created by a mutation or read from the backend).
     */
    isValidDocument(): boolean;
    /**
     * Returns whether the document exists and its data is known at the current
     * version.
     */
    isFoundDocument(): boolean;
    /**
     * Returns whether the document is known to not exist at the current version.
     */
    isNoDocument(): boolean;
    /**
     * Returns whether the document exists and its data is unknown at the current
     * version.
     */
    isUnknownDocument(): boolean;
    isEqual(other: Document_2 | null | undefined): boolean;
    /** Creates a mutable copy of this document. */
    mutableCopy(): MutableDocument;
    toString(): string;
}

/**
 * The type of `DocumentChange` may be 'added', 'removed', or 'modified'.
 */
export declare type DocumentChangeType = 'added' | 'removed' | 'modified';

declare type DocumentComparator = (doc1: Document_2, doc2: Document_2) => number;

/**
 * Document data (for use with {@link @firebase/firestore/lite#(setDoc:1)}) consists of fields mapped to
 * values.
 */
export declare interface DocumentData {
    /** A mapping between a field and its value. */
    [field: string]: any;
}

/**
 *
 * Creates an expression that returns the document ID from a path.
 *
 * @example
 * ```typescript
 * // Get the document ID from a path.
 * documentId(myDocumentReference);
 * ```
 *
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the documentId operation.
 */
export declare function documentId(documentPath: string | DocumentReference): FunctionExpression;

/**
 *
 * Creates an expression that returns the document ID from a path.
 *
 * @example
 * ```typescript
 * // Get the document ID from a path.
 * documentId(field("__path__"));
 * ```
 *
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the documentId operation.
 */
export declare function documentId(documentPathExpr: Expression): FunctionExpression;

/**
 * @internal
 */
declare class DocumentKey {
    readonly path: ResourcePath;
    constructor(path: ResourcePath);
    static fromPath(path: string): DocumentKey;
    static fromName(name: string): DocumentKey;
    static empty(): DocumentKey;
    get collectionGroup(): string;
    /** Returns true if the document is in the specified collectionId. */
    hasCollectionId(collectionId: string): boolean;
    /** Returns the collection group (i.e. the name of the parent collection) for this key. */
    getCollectionGroup(): string;
    /** Returns the fully qualified path to the parent collection. */
    getCollectionPath(): ResourcePath;
    isEqual(other: DocumentKey | null): boolean;
    toString(): string;
    static comparator(k1: DocumentKey, k2: DocumentKey): number;
    static isDocumentKey(path: ResourcePath): boolean;
    /**
     * Creates and returns a new document key with the given segments.
     *
     * @param segments - The segments of the path to the document
     * @returns A new instance of DocumentKey
     */
    static fromSegments(segments: string[]): DocumentKey;
}

declare type DocumentKeyMap<T> = ObjectMap<DocumentKey, T>;

declare type DocumentKeySet = SortedSet<DocumentKey>;

declare type DocumentMap = SortedMap<DocumentKey, Document_2>;

/**
 * @beta
 * Perform a full-text search on all indexed search fields in the document.
 *
 * @remarks This Expression can only be used within a `search` stage.
 *
 * @example
 * ```typescript
 * db.pipeline().collection('restaurants').search({
 *   query: documentMatches('waffles OR pancakes')
 * })
 * ```
 *
 * @param rquery Define the search query using the search domain-specific language (DSL).
 */
export declare function documentMatches(rquery: string | Expression): BooleanExpression;

/**
 * Provides methods to read and write document overlays.
 *
 * An overlay is a saved mutation, that gives a local view of a document when
 * applied to the remote version of the document.
 *
 * Each overlay stores the largest batch ID that is included in the overlay,
 * which allows us to remove the overlay once all batches leading up to it have
 * been acknowledged.
 */
declare interface DocumentOverlayCache {
    /**
     * Gets the saved overlay mutation for the given document key.
     * Returns null if there is no overlay for that key.
     */
    getOverlay(transaction: PersistenceTransaction, key: DocumentKey): PersistencePromise<Overlay | null>;
    /**
     * Gets the saved overlay mutation for the given document keys. Skips keys for
     * which there are no overlays.
     */
    getOverlays(transaction: PersistenceTransaction, keys: DocumentKey[]): PersistencePromise<OverlayMap>;
    getAllOverlays(transaction: PersistenceTransaction, sinceBatchId: number): PersistencePromise<OverlayMap>;
    /**
     * Saves the given document mutation map to persistence as overlays.
     * All overlays will have their largest batch id set to `largestBatchId`.
     */
    saveOverlays(transaction: PersistenceTransaction, largestBatchId: number, overlays: MutationMap): PersistencePromise<void>;
    /** Removes overlays for the given document keys and batch ID. */
    removeOverlaysForBatchId(transaction: PersistenceTransaction, documentKeys: DocumentKeySet, batchId: number): PersistencePromise<void>;
    /**
     * Returns all saved overlays for the given collection.
     *
     * @param transaction - The persistence transaction to use for this operation.
     * @param collection - The collection path to get the overlays for.
     * @param sinceBatchId - The minimum batch ID to filter by (exclusive).
     * Only overlays that contain a change past `sinceBatchId` are returned.
     * @returns Mapping of each document key in the collection to its overlay.
     */
    getOverlaysForCollection(transaction: PersistenceTransaction, collection: ResourcePath, sinceBatchId: number): PersistencePromise<OverlayMap>;
    /**
     * Returns `count` overlays with a batch ID higher than `sinceBatchId` for the
     * provided collection group, processed by ascending batch ID. The method
     * always returns all overlays for a batch even if the last batch contains
     * more documents than the remaining limit.
     *
     * @param transaction - The persistence transaction used for this operation.
     * @param collectionGroup - The collection group to get the overlays for.
     * @param sinceBatchId - The minimum batch ID to filter by (exclusive).
     * Only overlays that contain a change past `sinceBatchId` are returned.
     * @param count - The number of overlays to return. Can be exceeded if the last
     * batch contains more entries.
     * @returns Mapping of each document key in the collection group to its overlay.
     */
    getOverlaysForCollectionGroup(transaction: PersistenceTransaction, collectionGroup: string, sinceBatchId: number, count: number): PersistencePromise<OverlayMap>;
}

/**
 * A `DocumentReference` refers to a document location in a Firestore database
 * and can be used to write, read, or listen to the location. The document at
 * the referenced location may or may not exist.
 */
export declare class DocumentReference<AppModelType = DocumentData, DbModelType extends DocumentData = DocumentData> {
    /**
     * If provided, the `FirestoreDataConverter` associated with this instance.
     */
    readonly converter: FirestoreDataConverter_2<AppModelType, DbModelType> | null;
    readonly _key: DocumentKey;
    /** The type of this Firestore reference. */
    readonly type = "document";
    /**
     * The {@link Firestore} instance the document is in.
     * This is useful for performing transactions, for example.
     */
    readonly firestore: Firestore_2;
    /** @hideconstructor */
    constructor(firestore: Firestore_2, 
    /**
     * If provided, the `FirestoreDataConverter` associated with this instance.
     */
    converter: FirestoreDataConverter_2<AppModelType, DbModelType> | null, _key: DocumentKey);
    get _path(): ResourcePath;
    /**
     * The document's identifier within its collection.
     */
    get id(): string;
    /**
     * A string representing the path of the referenced document (relative
     * to the root of the database).
     */
    get path(): string;
    /**
     * The collection this `DocumentReference` belongs to.
     */
    get parent(): CollectionReference<AppModelType, DbModelType>;
    /**
     * Applies a custom data converter to this `DocumentReference`, allowing you
     * to use your own custom model objects with Firestore. When you call {@link
     * @firebase/firestore/lite#(setDoc:1)}, {@link @firebase/firestore/lite#getDoc}, etc. with the returned `DocumentReference`
     * instance, the provided converter will convert between Firestore data of
     * type `NewDbModelType` and your custom type `NewAppModelType`.
     *
     * @param converter - Converts objects to and from Firestore.
     * @returns A `DocumentReference` that uses the provided converter.
     */
    withConverter<NewAppModelType, NewDbModelType extends DocumentData = DocumentData>(converter: FirestoreDataConverter_2<NewAppModelType, NewDbModelType>): DocumentReference<NewAppModelType, NewDbModelType>;
    /**
     * Removes the current converter.
     *
     * @param converter - `null` removes the current converter.
     * @returns A `DocumentReference<DocumentData, DocumentData>` that does not
     * use a converter.
     */
    withConverter(converter: null): DocumentReference<DocumentData, DocumentData>;
    static _jsonSchemaVersion: string;
    static _jsonSchema: {
        type: Property<"string">;
        referencePath: Property<"string">;
    };
    /**
     * Returns a JSON-serializable representation of this `DocumentReference` instance.
     *
     * @returns a JSON representation of this object.
     */
    toJSON(): object;
    /**
     * Builds a `DocumentReference` instance from a JSON object created by
     * {@link DocumentReference.toJSON}.
     *
     * @param firestore - The {@link Firestore} instance the snapshot should be loaded for.
     * @param json - a JSON object represention of a `DocumentReference` instance
     * @returns an instance of {@link DocumentReference} if the JSON object could be parsed. Throws a
     * {@link FirestoreError} if an error occurs.
     */
    static fromJSON(firestore: Firestore_2, json: object): DocumentReference;
    /**
     * Builds a `DocumentReference` instance from a JSON object created by
     * {@link DocumentReference.toJSON}.
     *
     * @param firestore - The {@link Firestore} instance the snapshot should be loaded for.
     * @param json - a JSON object represention of a `DocumentReference` instance
     * @param converter - Converts objects to and from Firestore.
     * @returns an instance of {@link DocumentReference} if the JSON object could be parsed. Throws a
     * {@link FirestoreError} if an error occurs.
     */
    static fromJSON<NewAppModelType = DocumentData, NewDbModelType extends DocumentData = DocumentData>(firestore: Firestore_2, json: object, converter: FirestoreDataConverter_2<NewAppModelType, NewDbModelType>): DocumentReference<NewAppModelType, NewDbModelType>;
}

/**
 * DocumentSet is an immutable (copy-on-write) collection that holds documents
 * in order specified by the provided comparator. We always add a document key
 * comparator on top of what is provided to guarantee document equality based on
 * the key.
 */
declare class DocumentSet {
    /**
     * Returns an empty copy of the existing DocumentSet, using the same
     * comparator.
     */
    static emptySet(oldSet: DocumentSet): DocumentSet;
    private comparator;
    private keyedMap;
    private sortedSet;
    /** The default ordering is by key if the comparator is omitted */
    constructor(comp?: DocumentComparator);
    has(key: DocumentKey): boolean;
    get(key: DocumentKey): Document_2 | null;
    first(): Document_2 | null;
    last(): Document_2 | null;
    isEmpty(): boolean;
    /**
     * Returns the index of the provided key in the document set, or -1 if the
     * document key is not present in the set;
     */
    indexOf(key: DocumentKey): number;
    get size(): number;
    /** Iterates documents in order defined by "comparator" */
    forEach(cb: (doc: Document_2) => void): void;
    /** Inserts or updates a document with the same key */
    add(doc: Document_2): DocumentSet;
    /** Deletes a document with a given key */
    delete(key: DocumentKey): DocumentSet;
    isEqual(other: DocumentSet | null | undefined): boolean;
    toString(): string;
    private copy;
}

/**
 * A `DocumentSnapshot` contains data read from a document in your Firestore
 * database. The data can be extracted with `.data()` or `.get(<field>)` to
 * get a specific field.
 *
 * For a `DocumentSnapshot` that points to a non-existing document, any data
 * access will return 'undefined'. You can use the `exists()` method to
 * explicitly verify a document's existence.
 */
declare class DocumentSnapshot<AppModelType = DocumentData, DbModelType extends DocumentData = DocumentData> {
    _firestore: Firestore_2;
    _userDataWriter: AbstractUserDataWriter;
    _key: DocumentKey;
    _document: Document_2 | null;
    _converter: UntypedFirestoreDataConverter<AppModelType, DbModelType> | null;
    /** @hideconstructor protected */
    constructor(_firestore: Firestore_2, _userDataWriter: AbstractUserDataWriter, _key: DocumentKey, _document: Document_2 | null, _converter: UntypedFirestoreDataConverter<AppModelType, DbModelType> | null);
    /** Property of the `DocumentSnapshot` that provides the document's ID. */
    get id(): string;
    /**
     * The `DocumentReference` for the document included in the `DocumentSnapshot`.
     */
    get ref(): DocumentReference<AppModelType, DbModelType>;
    /**
     * Signals whether or not the document at the snapshot's location exists.
     *
     * @returns true if the document exists.
     */
    exists(): this is QueryDocumentSnapshot_2<AppModelType, DbModelType>;
    /**
     * Retrieves all fields in the document as an `Object`. Returns `undefined` if
     * the document doesn't exist.
     *
     * @returns An `Object` containing all fields in the document or `undefined`
     * if the document doesn't exist.
     */
    data(): AppModelType | undefined;
    /**
     * @internal
     * @private
     *
     * Retrieves all fields in the document as a proto Value. Returns `undefined` if
     * the document doesn't exist.
     *
     * @returns An `Object` containing all fields in the document or `undefined`
     * if the document doesn't exist.
     */
    _fieldsProto(): {
        [key: string]: firestoreV1ApiClientInterfaces.Value;
    } | undefined;
    /**
     * Retrieves the field specified by `fieldPath`. Returns `undefined` if the
     * document or field doesn't exist.
     *
     * @param fieldPath - The path (for example 'foo' or 'foo.bar') to a specific
     * field.
     * @returns The data at the specified field location or undefined if no such
     * field exists in the document.
     */
    get(fieldPath: string | FieldPath): any;
}

/**
 * A `DocumentSnapshot` contains data read from a document in your Firestore
 * database. The data can be extracted with `.data()` or `.get(<field>)` to
 * get a specific field.
 *
 * For a `DocumentSnapshot` that points to a non-existing document, any data
 * access will return 'undefined'. You can use the `exists()` method to
 * explicitly verify a document's existence.
 */
declare class DocumentSnapshot_2<AppModelType = DocumentData, DbModelType extends DocumentData = DocumentData> extends DocumentSnapshot<AppModelType, DbModelType> {
    readonly _firestore: Firestore;
    private readonly _firestoreImpl;
    /**
     *  Metadata about the `DocumentSnapshot`, including information about its
     *  source and local modifications.
     */
    readonly metadata: SnapshotMetadata;
    /** @hideconstructor protected */
    constructor(_firestore: Firestore, userDataWriter: AbstractUserDataWriter, key: DocumentKey, document: Document_2 | null, metadata: SnapshotMetadata, converter: UntypedFirestoreDataConverter<AppModelType, DbModelType> | null);
    /**
     * Returns whether or not the data exists. True if the document exists.
     */
    exists(): this is QueryDocumentSnapshot<AppModelType, DbModelType>;
    /**
     * Retrieves all fields in the document as an `Object`. Returns `undefined` if
     * the document doesn't exist.
     *
     * By default, `serverTimestamp()` values that have not yet been
     * set to their final value will be returned as `null`. You can override
     * this by passing an options object.
     *
     * @param options - An options object to configure how data is retrieved from
     * the snapshot (for example the desired behavior for server timestamps that
     * have not yet been set to their final value).
     * @returns An `Object` containing all fields in the document or `undefined` if
     * the document doesn't exist.
     */
    data(options?: SnapshotOptions): AppModelType | undefined;
    /**
     * Retrieves the field specified by `fieldPath`. Returns `undefined` if the
     * document or field doesn't exist.
     *
     * By default, a `serverTimestamp()` that has not yet been set to
     * its final value will be returned as `null`. You can override this by
     * passing an options object.
     *
     * @param fieldPath - The path (for example 'foo' or 'foo.bar') to a specific
     * field.
     * @param options - An options object to configure how the field is retrieved
     * from the snapshot (for example the desired behavior for server timestamps
     * that have not yet been set to their final value).
     * @returns The data at the specified field location or undefined if no such
     * field exists in the document.
     */
    get(fieldPath: string | FieldPath, options?: SnapshotOptions): any;
    static _jsonSchemaVersion: string;
    static _jsonSchema: {
        type: Property<"string">;
        bundleSource: Property<"string">;
        bundleName: Property<"string">;
        bundle: Property<"string">;
    };
    /**
     * Returns a JSON-serializable representation of this `DocumentSnapshot` instance.
     *
     * @returns a JSON representation of this object.  Throws a {@link FirestoreError} if this
     * `DocumentSnapshot` has pending writes.
     */
    toJSON(): object;
}

/**
 * Options defining how a DocumentsStage is evaluated. See {@link @firebase/firestore/pipelines#PipelineSource.(documents:1)}.
 */
export declare type DocumentsStageOptions = StageOptions & {
    /**
     * An array of paths and DocumentReferences specifying the individual documents that will be the source of this pipeline.
     * The converters for these DocumentReferences will be ignored and not have an effect on this pipeline.
     * There must be at least one document specified in the array.
     */
    docs: Array<string | DocumentReference>;
};

declare type DocumentVersionMap = SortedMap<DocumentKey, SnapshotVersion>;

declare interface DocumentViewChange {
    type: ChangeType;
    doc: Document_2;
}

/**
 *
 * Calculates the dot product between a field's vector value and a double array.
 *
 * @example
 * ```typescript
 * // Calculate the dot product distance between a feature vector and a target vector
 * dotProduct("features", [0.5, 0.8, 0.2]);
 * ```
 *
 * @param fieldName - The name of the field containing the first vector.
 * @param vector - The other vector (as an array of doubles or VectorValue) to calculate with.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the dot product between the two vectors.
 */
export declare function dotProduct(fieldName: string, vector: number[] | VectorValue): FunctionExpression;

/**
 *
 * Calculates the dot product between a field's vector value and a vector expression.
 *
 * @example
 * ```typescript
 * // Calculate the dot product distance between two document vectors: 'docVector1' and 'docVector2'
 * dotProduct("docVector1", field("docVector2"));
 * ```
 *
 * @param fieldName - The name of the field containing the first vector.
 * @param vectorExpression - The other vector (represented as an `Expression`) to calculate with.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the dot product between the two vectors.
 */
export declare function dotProduct(fieldName: string, vectorExpression: Expression): FunctionExpression;

/**
 *
 * Calculates the dot product between a vector expression and a double array.
 *
 * @example
 * ```typescript
 * // Calculate the dot product between a feature vector and a target vector
 * dotProduct(field("features"), [0.5, 0.8, 0.2]);
 * ```
 *
 * @param vectorExpression - The first vector (represented as an `Expression`) to calculate with.
 * @param vector - The other vector (as an array of doubles or VectorValue) to calculate with.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the dot product between the two vectors.
 */
export declare function dotProduct(vectorExpression: Expression, vector: number[] | VectorValue): FunctionExpression;

/**
 *
 * Calculates the dot product between two vector expressions.
 *
 * @example
 * ```typescript
 * // Calculate the dot product between two document vectors: 'docVector1' and 'docVector2'
 * dotProduct(field("docVector1"), field("docVector2"));
 * ```
 *
 * @param vectorExpression - The first vector (represented as an `Expression`) to calculate with.
 * @param otherVectorExpression - The other vector (represented as an `Expression`) to calculate with.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the dot product between the two vectors.
 */
export declare function dotProduct(vectorExpression: Expression, otherVectorExpression: Expression): FunctionExpression;

/**
 *
 * Creates an expression that checks if a field's value ends with a given postfix.
 *
 * @example
 * ```typescript
 * // Check if the 'filename' field ends with ".txt"
 * endsWith("filename", ".txt");
 * ```
 *
 * @param fieldName - The field name to check.
 * @param suffix - The postfix to check for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ends with' comparison.
 */
export declare function endsWith(fieldName: string, suffix: string): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value ends with a given postfix.
 *
 * @example
 * ```typescript
 * // Check if the 'url' field ends with the value of the 'extension' field
 * endsWith("url", field("extension"));
 * ```
 *
 * @param fieldName - The field name to check.
 * @param suffix - The expression representing the postfix.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ends with' comparison.
 */
export declare function endsWith(fieldName: string, suffix: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string expression ends with a given postfix.
 *
 * @example
 * ```typescript
 * // Check if the result of concatenating 'firstName' and 'lastName' fields ends with "Jr."
 * endsWith(field("fullName"), "Jr.");
 * ```
 *
 * @param stringExpression - The expression to check.
 * @param suffix - The postfix to check for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ends with' comparison.
 */
export declare function endsWith(stringExpression: Expression, suffix: string): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string expression ends with a given postfix.
 *
 * @example
 * ```typescript
 * // Check if the result of concatenating 'firstName' and 'lastName' fields ends with "Jr."
 * endsWith(field("fullName"), constant("Jr."));
 * ```
 *
 * @param stringExpression - The expression to check.
 * @param suffix - The postfix to check for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ends with' comparison.
 */
export declare function endsWith(stringExpression: Expression, suffix: Expression): BooleanExpression;

declare interface Entry<K, V> {
    key: K;
    value: V;
}

/**
 *
 * Creates an expression that checks if two expressions are equal.
 *
 * @example
 * ```typescript
 * // Check if the 'age' field is equal to an expression
 * equal(field("age"), field("minAge").add(10));
 * ```
 *
 * @param left - The first expression to compare.
 * @param right - The second expression to compare.
 * @returns A new `Expression` representing the equality comparison.
 */
export declare function equal(left: Expression, right: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if an expression is equal to a constant value.
 *
 * @example
 * ```typescript
 * // Check if the 'age' field is equal to 21
 * equal(field("age"), 21);
 * ```
 *
 * @param expression - The expression to compare.
 * @param value - The constant value to compare to.
 * @returns A new `Expression` representing the equality comparison.
 */
export declare function equal(expression: Expression, value: unknown): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is equal to an expression.
 *
 * @example
 * ```typescript
 * // Check if the 'age' field is equal to the 'limit' field
 * equal("age", field("limit"));
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param expression - The expression to compare to.
 * @returns A new `Expression` representing the equality comparison.
 */
export declare function equal(fieldName: string, expression: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is equal to a constant value.
 *
 * @example
 * ```typescript
 * // Check if the 'city' field is equal to string constant "London"
 * equal("city", "London");
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param value - The constant value to compare to.
 * @returns A new `Expression` representing the equality comparison.
 */
export declare function equal(fieldName: string, value: unknown): BooleanExpression;

/**
 *
 * Creates an expression that checks if an expression, when evaluated, is equal to any of the provided values or
 * expressions.
 *
 * @example
 * ```typescript
 * // Check if the 'category' field is either "Electronics" or value of field 'primaryType'
 * equalAny(field("category"), [constant("Electronics"), field("primaryType")]);
 * ```
 *
 * @param expression - The expression whose results to compare.
 * @param values - The values to check against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'IN' comparison.
 */
export declare function equalAny(expression: Expression, values: Array<Expression | unknown>): BooleanExpression;

/**
 *
 * Creates an expression that checks if an expression is equal to any of the provided values.
 *
 * @example
 * ```typescript
 * // Check if the 'category' field is set to a value in the disabledCategories field
 * equalAny(field("category"), field('disabledCategories'));
 * ```
 *
 * @param expression - The expression whose results to compare.
 * @param arrayExpression - An expression that evaluates to an array, whose elements to check for equality to the input.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'IN' comparison.
 */
export declare function equalAny(expression: Expression, arrayExpression: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is equal to any of the provided values or
 * expressions.
 *
 * @example
 * ```typescript
 * // Check if the 'category' field is either "Electronics" or value of field 'primaryType'
 * equalAny("category", [constant("Electronics"), field("primaryType")]);
 * ```
 *
 * @param fieldName - The field to compare.
 * @param values - The values to check against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'IN' comparison.
 */
export declare function equalAny(fieldName: string, values: Array<Expression | unknown>): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is equal to any of the provided values or
 * expressions.
 *
 * @example
 * ```typescript
 * // Check if the 'category' field is either "Electronics" or value of field 'primaryType'
 * equalAny("category", ["Electronics", field("primaryType")]);
 * ```
 *
 * @param fieldName - The field to compare.
 * @param arrayExpression - An expression that evaluates to an array, whose elements to check for equality to the input field.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'IN' comparison.
 */
export declare function equalAny(fieldName: string, arrayExpression: Expression): BooleanExpression;

/**
 *
 * Calculates the Euclidean distance between a field's vector value and a double array.
 *
 * @example
 * ```typescript
 * // Calculate the Euclidean distance between the 'location' field and a target location
 * euclideanDistance("location", [37.7749, -122.4194]);
 * ```
 *
 * @param fieldName - The name of the field containing the first vector.
 * @param vector - The other vector (as an array of doubles or VectorValue) to compare against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the Euclidean distance between the two vectors.
 */
export declare function euclideanDistance(fieldName: string, vector: number[] | VectorValue): FunctionExpression;

/**
 *
 * Calculates the Euclidean distance between a field's vector value and a vector expression.
 *
 * @example
 * ```typescript
 * // Calculate the Euclidean distance between two vector fields: 'pointA' and 'pointB'
 * euclideanDistance("pointA", field("pointB"));
 * ```
 *
 * @param fieldName - The name of the field containing the first vector.
 * @param vectorExpression - The other vector (represented as an `Expression`) to compare against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the Euclidean distance between the two vectors.
 */
export declare function euclideanDistance(fieldName: string, vectorExpression: Expression): FunctionExpression;

/**
 *
 * Calculates the Euclidean distance between a vector expression and a double array.
 *
 * @example
 * ```typescript
 * // Calculate the Euclidean distance between the 'location' field and a target location
 *
 * euclideanDistance(field("location"), [37.7749, -122.4194]);
 * ```
 *
 * @param vectorExpression - The first vector (represented as an `Expression`) to compare against.
 * @param vector - The other vector (as an array of doubles or VectorValue) to compare against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the Euclidean distance between the two vectors.
 */
export declare function euclideanDistance(vectorExpression: Expression, vector: number[] | VectorValue): FunctionExpression;

/**
 *
 * Calculates the Euclidean distance between two vector expressions.
 *
 * @example
 * ```typescript
 * // Calculate the Euclidean distance between two vector fields: 'pointA' and 'pointB'
 * euclideanDistance(field("pointA"), field("pointB"));
 * ```
 *
 * @param vectorExpression - The first vector (represented as an `Expression`) to compare against.
 * @param otherVectorExpression - The other vector (represented as an `Expression`) to compare against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the Euclidean distance between the two vectors.
 */
export declare function euclideanDistance(vectorExpression: Expression, otherVectorExpression: Expression): FunctionExpression;

/**
 * EventManager is responsible for mapping queries to query event emitters.
 * It handles "fan-out". -- Identical queries will re-use the same watch on the
 * backend.
 *
 * PORTING NOTE: On Web, EventManager `onListen` and `onUnlisten` need to be
 * assigned to SyncEngine's `listen()` and `unlisten()` API before usage. This
 * allows users to tree-shake the Watch logic.
 */
declare interface EventManager {
    onListen?: (query: QueryOrPipeline, enableRemoteListen: boolean) => Promise<ViewSnapshot>;
    onUnlisten?: (query: QueryOrPipeline, disableRemoteListen: boolean) => Promise<void>;
    onFirstRemoteStoreListen?: (query: QueryOrPipeline) => Promise<void>;
    onLastRemoteStoreUnlisten?: (query: QueryOrPipeline) => Promise<void>;
    terminate(): void;
}

/**
 * Executes a pipeline and returns a Promise to represent the asynchronous operation.
 *
 * The returned Promise can be used to track the progress of the pipeline execution
 * and retrieve the results (or handle any errors) asynchronously.
 *
 * The pipeline results are returned as a {@link @firebase/firestore/pipelines#PipelineSnapshot} that contains
 * a list of {@link @firebase/firestore/pipelines#PipelineResult} objects. Each {@link @firebase/firestore/pipelines#PipelineResult} typically
 * represents a single key/value map that has passed through all the
 * stages of the pipeline, however this might differ depending on the stages involved in the
 * pipeline. For example:
 *
 * <ul>
 *   <li>If there are no stages or only transformation stages, each {@link @firebase/firestore/pipelines#PipelineResult}
 *       represents a single document.</li>
 *   <li>If there is an aggregation, only a single {@link @firebase/firestore/pipelines#PipelineResult} is returned,
 *       representing the aggregated results over the entire dataset .</li>
 *   <li>If there is an aggregation stage with grouping, each {@link @firebase/firestore/pipelines#PipelineResult} represents a
 *       distinct group and its associated aggregated values.</li>
 * </ul>
 *
 * @example
 * ```typescript
 * const snapshot: PipelineSnapshot = await execute(firestore.pipeline().collection("books")
 *     .where(greaterThan(field("rating"), 4.5))
 *     .select("title", "author", "rating"));
 *
 * const results: PipelineResult[] = snapshot.results;
 * ```
 *
 * @param pipeline - The pipeline to execute.
 * @returns A Promise representing the asynchronous pipeline execution.
 */
export declare function execute(pipeline: Pipeline_2): Promise<PipelineSnapshot>;

/**
 * Executes a pipeline and returns a Promise to represent the asynchronous operation.
 *
 * The returned Promise can be used to track the progress of the pipeline execution
 * and retrieve the results (or handle any errors) asynchronously.
 *
 * The pipeline results are returned as a {@link @firebase/firestore/pipelines#PipelineSnapshot} that contains
 * a list of {@link @firebase/firestore/pipelines#PipelineResult} objects. Each {@link @firebase/firestore/pipelines#PipelineResult} typically
 * represents a single key/value map that has passed through all the
 * stages of the pipeline, however this might differ depending on the stages involved in the
 * pipeline. For example:
 *
 * <ul>
 *   <li>If there are no stages or only transformation stages, each {@link @firebase/firestore/pipelines#PipelineResult}
 *       represents a single document.</li>
 *   <li>If there is an aggregation, only a single {@link @firebase/firestore/pipelines#PipelineResult} is returned,
 *       representing the aggregated results over the entire dataset .</li>
 *   <li>If there is an aggregation stage with grouping, each {@link @firebase/firestore/pipelines#PipelineResult} represents a
 *       distinct group and its associated aggregated values.</li>
 * </ul>
 *
 * @example
 * ```typescript
 * const snapshot: PipelineSnapshot = await execute(firestore.pipeline().collection("books")
 *     .where(greaterThan(field("rating"), 4.5))
 *     .select("title", "author", "rating"));
 *
 * const results: PipelineResult[] = snapshot.results;
 * ```
 *
 * @param options - Specifies the pipeline to execute and other options for execute.
 * @returns A Promise representing the asynchronous pipeline execution.
 */
export declare function execute(options: PipelineExecuteOptions): Promise<PipelineSnapshot>;

/**
 *
 * Creates an expression that checks if a field exists.
 *
 * @example
 * ```typescript
 * // Check if the document has a field named "phoneNumber"
 * exists(field("phoneNumber"));
 * ```
 *
 * @param value - An expression evaluates to the name of the field to check.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'exists' check.
 */
export declare function exists(value: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field exists.
 *
 * @example
 * ```typescript
 * // Check if the document has a field named "phoneNumber"
 * exists("phoneNumber");
 * ```
 *
 * @param fieldName - The field name to check.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'exists' check.
 */
export declare function exists(fieldName: string): BooleanExpression;

/**
 * Creates an expression that computes e to the power of the expression's result.
 *
 * @example
 * ```typescript
 * // Compute e to the power of 2.
 * exp(constant(2));
 * ```
 *
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the exp of the numeric value.
 */
export declare function exp(expression: Expression): FunctionExpression;

/**
 * Creates an expression that computes e to the power of the expression's result.
 *
 * @example
 * ```typescript
 * // Compute e to the power of the 'value' field.
 * exp('value');
 * ```
 *
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the exp of the numeric value.
 */
export declare function exp(fieldName: string): FunctionExpression;

/**
 * @license
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Options that configure the SDK’s underlying network transport (WebChannel)
 * when long-polling is used.
 *
 * Note: This interface is "experimental" and is subject to change.
 *
 * See `FirestoreSettings.experimentalAutoDetectLongPolling`,
 * `FirestoreSettings.experimentalForceLongPolling`, and
 * `FirestoreSettings.experimentalLongPollingOptions`.
 */
declare interface ExperimentalLongPollingOptions {
    /**
     * The desired maximum timeout interval, in seconds, to complete a
     * long-polling GET response. Valid values are between 5 and 30, inclusive.
     * Floating point values are allowed and will be rounded to the nearest
     * millisecond.
     *
     * By default, when long-polling is used the "hanging GET" request sent by
     * the client times out after 30 seconds. To request a different timeout
     * from the server, set this setting with the desired timeout.
     *
     * Changing the default timeout may be useful, for example, if the buffering
     * proxy that necessitated enabling long-polling in the first place has a
     * shorter timeout for hanging GET requests, in which case setting the
     * long-polling timeout to a shorter value, such as 25 seconds, may fix
     * prematurely-closed hanging GET requests.
     * For example, see https://github.com/firebase/firebase-js-sdk/issues/6987.
     */
    timeoutSeconds?: number;
}

/**
 *
 * Represents an expression that can be evaluated to a value within the execution of a {@link
 * @firebase/firestore/pipelines#Pipeline}.
 *
 * Expressions are the building blocks for creating complex queries and transformations in
 * Firestore pipelines. They can represent:
 *
 * - **Field references:** Access values from document fields.
 * - **Literals:** Represent constant values (strings, numbers, booleans).
 * - **Function calls:** Apply functions to one or more expressions.
 *
 * The `Expression` class provides a fluent API for building expressions. You can chain together
 * method calls to create complex expressions.
 */
export declare abstract class Expression implements ProtoValueSerializable, UserData {
    abstract readonly expressionType: ExpressionType;
    abstract readonly _methodName?: string;
    /**
     * @private
     * @internal
     */
    abstract _toProto(serializer: JsonProtoSerializer): Value;
    _protoValueType: "ProtoValue";
    /**
     * @private
     * @internal
     */
    abstract _readUserData(context: ParseContext): void;
    /**
     * Creates an expression that adds this expression to another expression.
     *
     * @example
     * ```typescript
     * // Add the value of the 'quantity' field and the 'reserve' field.
     * field("quantity").add(field("reserve"));
     * ```
     *
     * @param second - The expression or literal to add to this expression.
     * @param others - Optional additional expressions or literals to add to this expression.
     * @returns A new `Expression` representing the addition operation.
     */
    add(second: Expression | unknown): FunctionExpression;
    /**
     * Wraps the expression in a [BooleanExpression].
     *
     * @returns A [BooleanExpression] representing the same expression.
     */
    asBoolean(): BooleanExpression;
    /**
     * Creates an expression that subtracts another expression from this expression.
     *
     * @example
     * ```typescript
     * // Subtract the 'discount' field from the 'price' field
     * field("price").subtract(field("discount"));
     * ```
     *
     * @param subtrahend - The expression to subtract from this expression.
     * @returns A new `Expression` representing the subtraction operation.
     */
    subtract(subtrahend: Expression): FunctionExpression;
    /**
     * Creates an expression that subtracts a constant value from this expression.
     *
     * @example
     * ```typescript
     * // Subtract 20 from the value of the 'total' field
     * field("total").subtract(20);
     * ```
     *
     * @param subtrahend - The constant value to subtract.
     * @returns A new `Expression` representing the subtraction operation.
     */
    subtract(subtrahend: number): FunctionExpression;
    /**
     * Creates an expression that multiplies this expression by another expression.
     *
     * @example
     * ```typescript
     * // Multiply the 'quantity' field by the 'price' field
     * field("quantity").multiply(field("price"));
     * ```
     *
     * @param second - The second expression or literal to multiply by.
     * @param others - Optional additional expressions or literals to multiply by.
     * @returns A new `Expression` representing the multiplication operation.
     */
    multiply(second: Expression | number): FunctionExpression;
    /**
     * Creates an expression that divides this expression by another expression.
     *
     * @example
     * ```typescript
     * // Divide the 'total' field by the 'count' field
     * field("total").divide(field("count"));
     * ```
     *
     * @param divisor - The expression to divide by.
     * @returns A new `Expression` representing the division operation.
     */
    divide(divisor: Expression): FunctionExpression;
    /**
     * Creates an expression that divides this expression by a constant value.
     *
     * @example
     * ```typescript
     * // Divide the 'value' field by 10
     * field("value").divide(10);
     * ```
     *
     * @param divisor - The constant value to divide by.
     * @returns A new `Expression` representing the division operation.
     */
    divide(divisor: number): FunctionExpression;
    /**
     * Creates an expression that calculates the modulo (remainder) of dividing this expression by another expression.
     *
     * @example
     * ```typescript
     * // Calculate the remainder of dividing the 'value' field by the 'divisor' field
     * field("value").mod(field("divisor"));
     * ```
     *
     * @param expression - The expression to divide by.
     * @returns A new `Expression` representing the modulo operation.
     */
    mod(expression: Expression): FunctionExpression;
    /**
     * Creates an expression that calculates the modulo (remainder) of dividing this expression by a constant value.
     *
     * @example
     * ```typescript
     * // Calculate the remainder of dividing the 'value' field by 10
     * field("value").mod(10);
     * ```
     *
     * @param value - The constant value to divide by.
     * @returns A new `Expression` representing the modulo operation.
     */
    mod(value: number): FunctionExpression;
    /**
     * Creates an expression that checks if this expression is equal to another expression.
     *
     * @example
     * ```typescript
     * // Check if the 'age' field is equal to 21
     * field("age").equal(21);
     * ```
     *
     * @param expression - The expression to compare for equality.
     * @returns A new `Expression` representing the equality comparison.
     */
    equal(expression: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is equal to a constant value.
     *
     * @example
     * ```typescript
     * // Check if the 'city' field is equal to "London"
     * field("city").equal("London");
     * ```
     *
     * @param value - The constant value to compare for equality.
     * @returns A new `Expression` representing the equality comparison.
     */
    equal(value: unknown): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is not equal to another expression.
     *
     * @example
     * ```typescript
     * // Check if the 'status' field is not equal to "completed"
     * field("status").notEqual("completed");
     * ```
     *
     * @param expression - The expression to compare for inequality.
     * @returns A new `Expression` representing the inequality comparison.
     */
    notEqual(expression: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is not equal to a constant value.
     *
     * @example
     * ```typescript
     * // Check if the 'country' field is not equal to "USA"
     * field("country").notEqual("USA");
     * ```
     *
     * @param value - The constant value to compare for inequality.
     * @returns A new `Expression` representing the inequality comparison.
     */
    notEqual(value: unknown): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is less than another expression.
     *
     * @example
     * ```typescript
     * // Check if the 'age' field is less than 'limit'
     * field("age").lessThan(field('limit'));
     * ```
     *
     * @param experession - The expression to compare for less than.
     * @returns A new `Expression` representing the less than comparison.
     */
    lessThan(experession: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is less than a constant value.
     *
     * @example
     * ```typescript
     * // Check if the 'price' field is less than 50
     * field("price").lessThan(50);
     * ```
     *
     * @param value - The constant value to compare for less than.
     * @returns A new `Expression` representing the less than comparison.
     */
    lessThan(value: unknown): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is less than or equal to another
     * expression.
     *
     * @example
     * ```typescript
     * // Check if the 'quantity' field is less than or equal to 20
     * field("quantity").lessThan(constant(20));
     * ```
     *
     * @param expression - The expression to compare for less than or equal to.
     * @returns A new `Expression` representing the less than or equal to comparison.
     */
    lessThanOrEqual(expression: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is less than or equal to a constant value.
     *
     * @example
     * ```typescript
     * // Check if the 'score' field is less than or equal to 70
     * field("score").lessThan(70);
     * ```
     *
     * @param value - The constant value to compare for less than or equal to.
     * @returns A new `Expression` representing the less than or equal to comparison.
     */
    lessThanOrEqual(value: unknown): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is greater than another expression.
     *
     * @example
     * ```typescript
     * // Check if the 'age' field is greater than the 'limit' field
     * field("age").greaterThan(field("limit"));
     * ```
     *
     * @param expression - The expression to compare for greater than.
     * @returns A new `Expression` representing the greater than comparison.
     */
    greaterThan(expression: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is greater than a constant value.
     *
     * @example
     * ```typescript
     * // Check if the 'price' field is greater than 100
     * field("price").greaterThan(100);
     * ```
     *
     * @param value - The constant value to compare for greater than.
     * @returns A new `Expression` representing the greater than comparison.
     */
    greaterThan(value: unknown): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is greater than or equal to another
     * expression.
     *
     * @example
     * ```typescript
     * // Check if the 'quantity' field is greater than or equal to field 'requirement' plus 1
     * field("quantity").greaterThanOrEqual(field('requirement').add(1));
     * ```
     *
     * @param expression - The expression to compare for greater than or equal to.
     * @returns A new `Expression` representing the greater than or equal to comparison.
     */
    greaterThanOrEqual(expression: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is greater than or equal to a constant
     * value.
     *
     * @example
     * ```typescript
     * // Check if the 'score' field is greater than or equal to 80
     * field("score").greaterThanOrEqual(80);
     * ```
     *
     * @param value - The constant value to compare for greater than or equal to.
     * @returns A new `Expression` representing the greater than or equal to comparison.
     */
    greaterThanOrEqual(value: unknown): BooleanExpression;
    /**
     * Creates an expression that concatenates an array expression with one or more other arrays.
     *
     * @example
     * ```typescript
     * // Combine the 'items' array with another array field.
     * field("items").arrayConcat(field("otherItems"));
     * ```
     * @param secondArray - Second array expression or array literal to concatenate.
     * @param otherArrays - Optional additional array expressions or array literals to concatenate.
     * @returns A new `Expression` representing the concatenated array.
     */
    arrayConcat(secondArray: Expression | unknown[], ...otherArrays: Array<Expression | unknown[]>): FunctionExpression;
    /**
     * Creates an expression that checks if an array contains a specific element.
     *
     * @example
     * ```typescript
     * // Check if the 'sizes' array contains the value from the 'selectedSize' field
     * field("sizes").arrayContains(field("selectedSize"));
     * ```
     *
     * @param expression - The element to search for in the array.
     * @returns A new `Expression` representing the 'array_contains' comparison.
     */
    arrayContains(expression: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if an array contains a specific value.
     *
     * @example
     * ```typescript
     * // Check if the 'colors' array contains "red"
     * field("colors").arrayContains("red");
     * ```
     *
     * @param value - The element to search for in the array.
     * @returns A new `Expression` representing the 'array_contains' comparison.
     */
    arrayContains(value: unknown): BooleanExpression;
    /**
     * Creates an expression that checks if an array contains all the specified elements.
     *
     * @example
     * ```typescript
     * // Check if the 'tags' array contains both the value in field "tag1" and the literal value "tag2"
     * field("tags").arrayContainsAll([field("tag1"), "tag2"]);
     * ```
     *
     * @param values - The elements to check for in the array.
     * @returns A new `Expression` representing the 'array_contains_all' comparison.
     */
    arrayContainsAll(values: Array<Expression | unknown>): BooleanExpression;
    /**
     * Creates an expression that checks if an array contains all the specified elements.
     *
     * @example
     * ```typescript
     * // Check if the 'tags' array contains both of the values from field "tag1" and the literal value "tag2"
     * field("tags").arrayContainsAll(array([field("tag1"), "tag2"]));
     * ```
     *
     * @param arrayExpression - The elements to check for in the array.
     * @returns A new `Expression` representing the 'array_contains_all' comparison.
     */
    arrayContainsAll(arrayExpression: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if an array contains any of the specified elements.
     *
     * @example
     * ```typescript
     * // Check if the 'categories' array contains either values from field "cate1" or "cate2"
     * field("categories").arrayContainsAny([field("cate1"), field("cate2")]);
     * ```
     *
     * @param values - The elements to check for in the array.
     * @returns A new `Expression` representing the 'array_contains_any' comparison.
     */
    arrayContainsAny(values: Array<Expression | unknown>): BooleanExpression;
    /**
     * Creates an expression that checks if an array contains any of the specified elements.
     *
     * @example
     * ```typescript
     * // Check if the 'groups' array contains either the value from the 'userGroup' field
     * // or the value "guest"
     * field("groups").arrayContainsAny(array([field("userGroup"), "guest"]));
     * ```
     *
     * @param arrayExpression - The elements to check for in the array.
     * @returns A new `Expression` representing the 'array_contains_any' comparison.
     */
    arrayContainsAny(arrayExpression: Expression): BooleanExpression;
    /**
     * Creates an expression that reverses an array.
     *
     * @example
     * ```typescript
     * // Reverse the value of the 'myArray' field.
     * field("myArray").arrayReverse();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the reversed array.
     */
    arrayReverse(): FunctionExpression;
    /**
     * Creates an expression that calculates the length of an array.
     *
     * @example
     * ```typescript
     * // Get the number of items in the 'cart' array
     * field("cart").arrayLength();
     * ```
     *
     * @returns A new `Expression` representing the length of the array.
     */
    arrayLength(): FunctionExpression;
    /**
     * Creates an expression that checks if this expression is equal to any of the provided values or
     * expressions.
     *
     * @example
     * ```typescript
     * // Check if the 'category' field is either "Electronics" or value of field 'primaryType'
     * field("category").equalAny(["Electronics", field("primaryType")]);
     * ```
     *
     * @param values - The values or expressions to check against.
     * @returns A new `Expression` representing the 'IN' comparison.
     */
    equalAny(values: Array<Expression | unknown>): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is equal to any of the provided values or
     * expressions.
     *
     * @example
     * ```typescript
     * // Check if the 'category' field is either "Electronics" or value of field 'primaryType'
     * field("category").equalAny(array(["Electronics", field("primaryType")]));
     * ```
     *
     * @param arrayExpression - An expression that evaluates to an array of values to check against.
     * @returns A new `Expression` representing the 'IN' comparison.
     */
    equalAny(arrayExpression: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is not equal to any of the provided values or
     * expressions.
     *
     * @example
     * ```typescript
     * // Check if the 'status' field is neither "pending" nor the value of 'rejectedStatus'
     * field("status").notEqualAny(["pending", field("rejectedStatus")]);
     * ```
     *
     * @param values - The values or expressions to check against.
     * @returns A new `Expression` representing the 'notEqualAny' comparison.
     */
    notEqualAny(values: Array<Expression | unknown>): BooleanExpression;
    /**
     * Creates an expression that checks if this expression is not equal to any of the values in the evaluated expression.
     *
     * @example
     * ```typescript
     * // Check if the 'status' field is not equal to any value in the field 'rejectedStatuses'
     * field("status").notEqualAny(field('rejectedStatuses'));
     * ```
     *
     * @param arrayExpression - The values or expressions to check against.
     * @returns A new `Expression` representing the 'notEqualAny' comparison.
     */
    notEqualAny(arrayExpression: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if a field exists in the document.
     *
     * @example
     * ```typescript
     * // Check if the document has a field named "phoneNumber"
     * field("phoneNumber").exists();
     * ```
     *
     * @returns A new `Expression` representing the 'exists' check.
     */
    exists(): BooleanExpression;
    /**
     * Creates an expression that calculates the character length of a string in UTF-8.
     *
     * @example
     * ```typescript
     * // Get the character length of the 'name' field in its UTF-8 form.
     * field("name").charLength();
     * ```
     *
     * @returns A new `Expression` representing the length of the string.
     */
    charLength(): FunctionExpression;
    /**
     * Creates an expression that performs a case-sensitive string comparison.
     *
     * @example
     * ```typescript
     * // Check if the 'title' field contains the word "guide" (case-sensitive)
     * field("title").like("%guide%");
     * ```
     *
     * @param pattern - The pattern to search for. You can use "%" as a wildcard character.
     * @returns A new `Expression` representing the 'like' comparison.
     */
    like(pattern: string): BooleanExpression;
    /**
     * Creates an expression that performs a case-sensitive string comparison.
     *
     * @example
     * ```typescript
     * // Check if the 'title' field contains the word "guide" (case-sensitive)
     * field("title").like("%guide%");
     * ```
     *
     * @param pattern - The pattern to search for. You can use "%" as a wildcard character.
     * @returns A new `Expression` representing the 'like' comparison.
     */
    like(pattern: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if a string contains a specified regular expression as a
     * substring.
     *
     * @example
     * ```typescript
     * // Check if the 'description' field contains "example" (case-insensitive)
     * field("description").regexContains("(?i)example");
     * ```
     *
     * @param pattern - The regular expression to use for the search.
     * @returns A new `Expression` representing the 'contains' comparison.
     */
    regexContains(pattern: string): BooleanExpression;
    /**
     * Creates an expression that checks if a string contains a specified regular expression as a
     * substring.
     *
     * @example
     * ```typescript
     * // Check if the 'description' field contains the regular expression stored in field 'regex'
     * field("description").regexContains(field("regex"));
     * ```
     *
     * @param pattern - The regular expression to use for the search.
     * @returns A new `Expression` representing the 'contains' comparison.
     */
    regexContains(pattern: Expression): BooleanExpression;
    /**
     * Creates an expression that returns the first substring of a string expression that matches
     * a specified regular expression.
     *
     * This expression uses the {@link https://github.com/google/re2/wiki/Syntax | RE2} regular expression syntax.
     *
     * @example
     * ```typescript
     * // Extract the domain from an email address
     * field("email").regexFind("@.+")
     * ```
     *
     * @param pattern - The regular expression to search for.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the regular expression find function.
     */
    regexFind(pattern: string): FunctionExpression;
    /**
     * Creates an expression that returns the first substring of a string expression that matches
     * a specified regular expression.
     *
     * This expression uses the {@link https://github.com/google/re2/wiki/Syntax | RE2} regular expression syntax.
     *
     * @example
     * ```typescript
     * // Extract the domain from an email address
     * field("email").regexFind(field("domain"))
     * ```
     *
     * @param pattern - The regular expression to search for.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the regular expression find function.
     */
    regexFind(pattern: Expression): FunctionExpression;
    /**
     *
     * Creates an expression that evaluates to a list of all substrings in this string expression that
     * match a specified regular expression.
     *
     * This expression uses the {@link https://github.com/google/re2/wiki/Syntax | RE2} regular expression syntax.
     *
     * @example
     * ```typescript
     * // Extract all hashtags from a post content field
     * field("content").regexFindAll("#[A-Za-z0-9_]+")
     * ```
     *
     * @param pattern - The regular expression to search for.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} that evaluates to an array of matched substrings.
     */
    regexFindAll(pattern: string): FunctionExpression;
    /**
     *
     * Creates an expression that evaluates to a list of all substrings in this string expression that
     * match a specified regular expression.
     *
     * This expression uses the {@link https://github.com/google/re2/wiki/Syntax | RE2} regular expression syntax.
     *
     * @example
     * ```typescript
     * // Extract all names from a post content field
     * field("content").regexFindAll(field("names"))
     * ```
     *
     * @param pattern - The regular expression to search for.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} that evaluates to an array of matched substrings.
     */
    regexFindAll(pattern: Expression): FunctionExpression;
    /**
     * Creates an expression that checks if a string matches a specified regular expression.
     *
     * @example
     * ```typescript
     * // Check if the 'email' field matches a valid email pattern
     * field("email").regexMatch("[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}");
     * ```
     *
     * @param pattern - The regular expression to use for the match.
     * @returns A new `Expression` representing the regular expression match.
     */
    regexMatch(pattern: string): BooleanExpression;
    /**
     * Creates an expression that checks if a string matches a specified regular expression.
     *
     * @example
     * ```typescript
     * // Check if the 'email' field matches a regular expression stored in field 'regex'
     * field("email").regexMatch(field("regex"));
     * ```
     *
     * @param pattern - The regular expression to use for the match.
     * @returns A new `Expression` representing the regular expression match.
     */
    regexMatch(pattern: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if a string contains a specified substring.
     *
     * @example
     * ```typescript
     * // Check if the 'description' field contains "example".
     * field("description").stringContains("example");
     * ```
     *
     * @param substring - The substring to search for.
     * @returns A new `Expression` representing the 'contains' comparison.
     */
    stringContains(substring: string): BooleanExpression;
    /**
     * Creates an expression that checks if a string contains the string represented by another expression.
     *
     * @example
     * ```typescript
     * // Check if the 'description' field contains the value of the 'keyword' field.
     * field("description").stringContains(field("keyword"));
     * ```
     *
     * @param expr - The expression representing the substring to search for.
     * @returns A new `Expression` representing the 'contains' comparison.
     */
    stringContains(expr: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if a string starts with a given prefix.
     *
     * @example
     * ```typescript
     * // Check if the 'name' field starts with "Mr."
     * field("name").startsWith("Mr.");
     * ```
     *
     * @param prefix - The prefix to check for.
     * @returns A new `Expression` representing the 'starts with' comparison.
     */
    startsWith(prefix: string): BooleanExpression;
    /**
     * Creates an expression that checks if a string starts with a given prefix (represented as an
     * expression).
     *
     * @example
     * ```typescript
     * // Check if the 'fullName' field starts with the value of the 'firstName' field
     * field("fullName").startsWith(field("firstName"));
     * ```
     *
     * @param prefix - The prefix expression to check for.
     * @returns A new `Expression` representing the 'starts with' comparison.
     */
    startsWith(prefix: Expression): BooleanExpression;
    /**
     * Creates an expression that checks if a string ends with a given postfix.
     *
     * @example
     * ```typescript
     * // Check if the 'filename' field ends with ".txt"
     * field("filename").endsWith(".txt");
     * ```
     *
     * @param suffix - The postfix to check for.
     * @returns A new `Expression` representing the 'ends with' comparison.
     */
    endsWith(suffix: string): BooleanExpression;
    /**
     * Creates an expression that checks if a string ends with a given postfix (represented as an
     * expression).
     *
     * @example
     * ```typescript
     * // Check if the 'url' field ends with the value of the 'extension' field
     * field("url").endsWith(field("extension"));
     * ```
     *
     * @param suffix - The postfix expression to check for.
     * @returns A new `Expression` representing the 'ends with' comparison.
     */
    endsWith(suffix: Expression): BooleanExpression;
    /**
     * Creates an expression that converts a string to lowercase.
     *
     * @example
     * ```typescript
     * // Convert the 'name' field to lowercase
     * field("name").toLower();
     * ```
     *
     * @returns A new `Expression` representing the lowercase string.
     */
    toLower(): FunctionExpression;
    /**
     * Creates an expression that converts a string to uppercase.
     *
     * @example
     * ```typescript
     * // Convert the 'title' field to uppercase
     * field("title").toUpper();
     * ```
     *
     * @returns A new `Expression` representing the uppercase string.
     */
    toUpper(): FunctionExpression;
    /**
     * Creates an expression that removes leading and trailing characters from a string or byte array.
     *
     * @example
     * ```typescript
     * // Trim whitespace from the 'userInput' field
     * field("userInput").trim();
     *
     * // Trim quotes from the 'userInput' field
     * field("userInput").trim('"');
     * ```
     * @param valueToTrim - Optional This parameter is treated as a set of characters or bytes that will be
     * trimmed from the input. If not specified, then whitespace will be trimmed.
     * @returns A new `Expression` representing the trimmed string or byte array.
     */
    trim(valueToTrim?: string | Expression | Bytes): FunctionExpression;
    /**
     * Trims whitespace or a specified set of characters/bytes from the beginning of a string or byte array.
     *
     * @example
     * ```typescript
     * // Trim whitespace from the beginning of the 'userInput' field
     * field("userInput").ltrim();
     *
     * // Trim quotes from the beginning of the 'userInput' field
     * field("userInput").ltrim('"');
     * ```
     *
     * @param valueToTrim - Optional. A string or byte array containing the characters/bytes to trim.
     * If not specified, whitespace will be trimmed.
     * @returns A new `Expression` representing the trimmed string.
     */
    ltrim(valueToTrim?: string | Expression | Bytes): FunctionExpression;
    /**
     * Trims whitespace or a specified set of characters/bytes from the end of a string or byte array.
     *
     * @example
     * ```typescript
     * // Trim whitespace from the end of the 'userInput' field
     * field("userInput").rtrim();
     *
     * // Trim quotes from the end of the 'userInput' field
     * field("userInput").rtrim('"');
     * ```
     *
     * @param valueToTrim - Optional. A string or byte array containing the characters/bytes to trim.
     * If not specified, whitespace will be trimmed.
     * @returns A new `Expression` representing the trimmed string or byte array.
     */
    rtrim(valueToTrim?: string | Expression | Bytes): FunctionExpression;
    /**
     * Creates an expression that returns the data type of this expression's result, as a string.
     *
     * @remarks
     * This is evaluated on the backend. This means:
     * 1. Generic typed elements (like `array<string>`) evaluate strictly to the primitive `'array'`.
     * 2. Any custom `FirestoreDataConverter` mappings are ignored.
     * 3. For numeric values, the backend does not yield the JavaScript `"number"` type; it evaluates
     *    precisely as `"int64"` or `"float64"`.
     * 4. For date or timestamp objects, the backend evaluates to `"timestamp"`.
     *
     * @example
     * ```typescript
     * // Get the data type of the value in field 'title'
     * field('title').type()
     * ```
     *
     * @returns A new `Expression` representing the data type.
     */
    type(): FunctionExpression;
    /**
     * Creates an expression that checks if the result of this expression is of the given type.
     *
     * @remarks Null or undefined fields evaluate to skip/error. Use `ifAbsent()` / `isAbsent()` to evaluate missing data.
     * Supported values for `type` are:
     * `'null'`, `'array'`, `'boolean'`, `'bytes'`, `'timestamp'`, `'geo_point'`, `'number'`,
     * `'int32'`, `'int64'`, `'float64'`, `'decimal128'`, `'map'`, `'reference'`, `'string'`,
     * `'vector'`, `'max_key'`, `'min_key'`, `'object_id'`, `'regex'`, `'request_timestamp'`.
     *
     * @example
     * ```typescript
     * // Check if the 'price' field is specifically an integer (not just 'number')
     * field('price').isType('int64');
     * ```
     *
     * @param type - The type to check for.
     * @returns A new `BooleanExpression` that evaluates to true if the expression's result is of the given type, false otherwise.
     */
    isType(type: string): BooleanExpression;
    /**
     * Creates an expression that concatenates string expressions together.
     *
     * @example
     * ```typescript
     * // Combine the 'firstName', " ", and 'lastName' fields into a single string
     * field("firstName").stringConcat(constant(" "), field("lastName"));
     * ```
     *
     * @param secondString - The additional expression or string literal to concatenate.
     * @param otherStrings - Optional additional expressions or string literals to concatenate.
     * @returns A new `Expression` representing the concatenated string.
     */
    stringConcat(secondString: Expression | string, ...otherStrings: Array<Expression | string>): FunctionExpression;
    /**
     * Creates an expression that finds the index of the first occurrence of a substring or byte sequence.
     *
     * @example
     * ```typescript
     * // Find the index of "foo" in the 'text' field
     * field("text").stringIndexOf("foo");
     * ```
     *
     * @param search - The substring or byte sequence to search for.
     * @returns A new `Expression` representing the index of the first occurrence.
     */
    stringIndexOf(search: string | Expression | Bytes): FunctionExpression;
    /**
     * Creates an expression that repeats a string or byte array a specified number of times.
     *
     * @example
     * ```typescript
     * // Repeat the 'label' field 3 times
     * field("label").stringRepeat(3);
     * ```
     *
     * @param repetitions - The number of times to repeat the string or byte array.
     * @returns A new `Expression` representing the repeated string or byte array.
     */
    stringRepeat(repetitions: number | Expression): FunctionExpression;
    /**
     * Creates an expression that replaces all occurrences of a substring or byte sequence with a replacement.
     *
     * @example
     * ```typescript
     * // Replace all occurrences of "foo" with "bar" in the 'text' field
     * field("text").stringReplaceAll("foo", "bar");
     * ```
     *
     * @param find - The substring or byte sequence to search for.
     * @param replacement - The replacement string or byte sequence.
     * @returns A new `Expression` representing the string or byte array with replacements.
     */
    stringReplaceAll(find: string | Expression | Bytes, replacement: string | Expression | Bytes): FunctionExpression;
    /**
     * Creates an expression that replaces the first occurrence of a substring or byte sequence with a replacement.
     *
     * @example
     * ```typescript
     * // Replace the first occurrence of "foo" with "bar" in the 'text' field
     * field("text").stringReplaceOne("foo", "bar");
     * ```
     *
     * @param find - The substring or byte sequence to search for.
     * @param replacement - The replacement string or byte sequence.
     * @returns A new `Expression` representing the string or byte array with the replacement.
     */
    stringReplaceOne(find: string | Expression | Bytes, replacement: string | Expression | Bytes): FunctionExpression;
    /**
     * Creates an expression that concatenates expression results together.
     *
     * @example
     * ```typescript
     * // Combine the 'firstName', ' ', and 'lastName' fields into a single value.
     * field("firstName").concat(constant(" "), field("lastName"));
     * ```
     *
     * @param second - The additional expression or literal to concatenate.
     * @param others - Optional additional expressions or literals to concatenate.
     * @returns A new `Expression` representing the concatenated value.
     */
    concat(second: Expression | unknown, ...others: Array<Expression | unknown>): FunctionExpression;
    /**
     * Creates an expression that reverses this string expression.
     *
     * @example
     * ```typescript
     * // Reverse the value of the 'myString' field.
     * field("myString").reverse();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the reversed string.
     */
    reverse(): FunctionExpression;
    /**
     * Filters the array using a provided alias and predicate expression.
     *
     * @example
     * ```typescript
     * // Filter the 'items' array to only include those where the 'price' is greater than 10
     * field("items").arrayFilter('item', greaterThan(variable('item.price'), 10));
     * ```
     *
     * @param alias - The variable name to use for each element.
     * @param filter - The predicate boolean expression to filter by.
     * @returns A new `Expression` representing the filtered array.
     */
    arrayFilter(alias: string, filter: BooleanExpression): FunctionExpression;
    /**
     * Creates an expression that applies a provided transformation to each element in an array.
     *
     * @example
     * ```typescript
     * // Transform the 'scores' array by multiplying each score by 10
     * field("scores").arrayTransform("score", multiply(variable("score"), 10));
     * ```
     *
     * @param elementAlias - The variable name to use for each element.
     * @param transform - The lambda expression used to transform the elements.
     * @returns A new `Expression` representing the arrayTransform operation.
     */
    arrayTransform(elementAlias: string, transform: Expression): FunctionExpression;
    /**
     * Creates an expression that applies a provided transformation to each element in an array, providing the element's index to the transformation expression.
     *
     * @example
     * ```typescript
     * // Transform the 'scores' array by adding the index to each score
     * field("scores").arrayTransformWithIndex("score", "i", add(variable("score"), variable("i")));
     * ```
     *
     * @param elementAlias - The variable name to use for each element.
     * @param indexAlias - The variable name to use for the current index.
     * @param transform - The lambda expression used to transform the elements.
     * @returns A new `Expression` representing the arrayTransformWithIndex operation.
     */
    arrayTransformWithIndex(elementAlias: string, indexAlias: string, transform: Expression): FunctionExpression;
    /**
     * Returns a subset of the array.
     *
     * @example
     * ```typescript
     * // Get 5 elements from the 'items' array starting from index 2
     * field("items").arraySlice(2, 5);
     *
     * // Get n number of elements from the 'items' array starting from index 2
     * field("items").arraySlice(2, field("count"));
     * ```
     *
     * @param offset - The starting offset.
     * @param length - The optional length of the slice.
     * @returns A new `Expression` representing the sliced array.
     */
    arraySlice(offset: number | Expression, length?: number | Expression): FunctionExpression;
    /**
     * Returns the first element of the array.
     *
     * @example
     * ```typescript
     * // Get the first element of the 'myArray' field.
     * field("myArray").arrayFirst();
     * ```
     *
     * @returns A new `Expression` representing the first element.
     */
    arrayFirst(): FunctionExpression;
    /**
     * Returns the first `n` elements of the array.
     *
     * @example
     * ```typescript
     * // Get the first 3 elements of the 'myArray' field.
     * field("myArray").arrayFirstN(3);
     * ```
     *
     * @param n - The number of elements to return.
     * @returns A new `Expression` representing the first `n` elements.
     */
    arrayFirstN(n: number): FunctionExpression;
    /**
     * Returns the first `n` elements of the array.
     *
     * @example
     * ```typescript
     * // Get the first n elements of the 'myArray' field.
     * field("myArray").arrayFirstN(field("count"));
     * ```
     *
     * @param n - An expression evaluating to the number of elements to return.
     * @returns A new `Expression` representing the first `n` elements.
     */
    arrayFirstN(n: Expression): FunctionExpression;
    /**
     * Returns the last element of the array.
     *
     * @example
     * ```typescript
     * // Get the last element of the 'myArray' field.
     * field("myArray").arrayLast();
     * ```
     *
     * @returns A new `Expression` representing the last element.
     */
    arrayLast(): FunctionExpression;
    /**
     * Returns the last `n` elements of the array.
     *
     * @example
     * ```typescript
     * // Get the last 3 elements of the 'myArray' field.
     * field("myArray").arrayLastN(3);
     * ```
     *
     * @param n - The number of elements to return.
     * @returns A new `Expression` representing the last `n` elements.
     */
    arrayLastN(n: number): FunctionExpression;
    /**
     * Returns the last `n` elements of the array.
     *
     * @example
     * ```typescript
     * // Get the last n elements of the 'myArray' field.
     * field("myArray").arrayLastN(field("count"));
     * ```
     *
     * @param n - An expression evaluating to the number of elements to return.
     * @returns A new `Expression` representing the last `n` elements.
     */
    arrayLastN(n: Expression): FunctionExpression;
    /**
     * Returns the maximum value in the array.
     *
     * @example
     * ```typescript
     * // Get the maximum value of the 'myArray' field.
     * field("myArray").arrayMaximum();
     * ```
     *
     * @returns A new `Expression` representing the maximum value.
     */
    arrayMaximum(): FunctionExpression;
    /**
     * Returns the largest `n` elements of the array.
     *
     * Note: Returns the n largest non-null elements in the array, in descending
     * order. This does not use a stable sort, meaning the order of equivalent
     * elements is undefined.
     *
     * @example
     * ```typescript
     * // Get the largest 3 elements of the 'myArray' field.
     * field("myArray").arrayMaximumN(3);
     * ```
     *
     * @param n - The number of elements to return.
     * @returns A new `Expression` representing the largest `n` elements.
     */
    arrayMaximumN(n: number): FunctionExpression;
    /**
     * Returns the largest `n` elements of the array.
     *
     * Note: Returns the n largest non-null elements in the array, in descending
     * order. This does not use a stable sort, meaning the order of equivalent
     * elements is undefined.
     *
     * @example
     * ```typescript
     * // Get the largest n elements of the 'myArray' field.
     * field("myArray").arrayMaximumN(field("count"));
     * ```
     *
     * @param n - An expression evaluating to the number of elements to return.
     * @returns A new `Expression` representing the largest `n` elements.
     */
    arrayMaximumN(n: Expression): FunctionExpression;
    /**
     * Returns the minimum value in the array.
     *
     * @example
     * ```typescript
     * // Get the minimum value of the 'myArray' field.
     * field("myArray").arrayMinimum();
     * ```
     *
     * @returns A new `Expression` representing the minimum value.
     */
    arrayMinimum(): FunctionExpression;
    /**
     * Returns the smallest `n` elements of the array.
     *
     * Note: Returns the n smallest non-null elements in the array, in ascending
     * order. This does not use a stable sort, meaning the order of equivalent
     * elements is undefined.
     *
     * @example
     * ```typescript
     * // Get the smallest 3 elements of the 'myArray' field.
     * field("myArray").arrayMinimumN(3);
     * ```
     *
     * @param n - The number of elements to return.
     * @returns A new `Expression` representing the smallest `n` elements.
     */
    arrayMinimumN(n: number): FunctionExpression;
    /**
     * Returns the smallest `n` elements of the array.
     *
     * Note: Returns the n smallest non-null elements in the array, in ascending
     * order. This does not use a stable sort, meaning the order of equivalent
     * elements is undefined.
     *
     * @example
     * ```typescript
     * // Get the smallest n elements of the 'myArray' field.
     * field("myArray").arrayMinimumN(field("count"));
     * ```
     *
     * @param n - An expression evaluating to the number of elements to return.
     * @returns A new `Expression` representing the smallest `n` elements.
     */
    arrayMinimumN(n: Expression): FunctionExpression;
    /**
     * Returns the first index of the search value in the array, or -1 if not found.
     *
     * @example
     * ```typescript
     * // Get the first index of the value 3 in the 'myArray' field.
     * field("myArray").arrayIndexOf(3);
     * ```
     *
     * @param search - The value to search for.
     * @returns A new `Expression` representing the index.
     */
    arrayIndexOf(search: unknown): FunctionExpression;
    /**
     * Returns the first index of the search value in the array, or -1 if not found.
     *
     * @example
     * ```typescript
     * // Get the first index of the value in 'searchVal' field in the 'myArray' field.
     * field("myArray").arrayIndexOf(field("searchVal"));
     * ```
     *
     * @param search - An expression evaluating to the value to search for.
     * @returns A new `Expression` representing the index.
     */
    arrayIndexOf(search: Expression): FunctionExpression;
    /**
     * Returns the last index of the search value in the array, or -1 if not found.
     *
     * @example
     * ```typescript
     * // Get the last index of the value 3 in the 'myArray' field.
     * field("myArray").arrayLastIndexOf(3);
     * ```
     *
     * @param search - The value to search for.
     * @returns A new `Expression` representing the index.
     */
    arrayLastIndexOf(search: unknown): FunctionExpression;
    /**
     * Returns the last index of the search value in the array, or -1 if not found.
     *
     * @example
     * ```typescript
     * // Get the last index of the value in 'searchVal' field in the 'myArray' field.
     * field("myArray").arrayLastIndexOf(field("searchVal"));
     * ```
     *
     * @param search - An expression evaluating to the value to search for.
     * @returns A new `Expression` representing the index.
     */
    arrayLastIndexOf(search: Expression): FunctionExpression;
    /**
     * Returns all indices of the search value in the array.
     *
     * @example
     * ```typescript
     * // Get all indices of the value 3 in the 'myArray' field.
     * field("myArray").arrayIndexOfAll(3);
     * ```
     *
     * @param search - The value to search for.
     * @returns A new `Expression` representing the indices.
     */
    arrayIndexOfAll(search: unknown): FunctionExpression;
    /**
     * Returns all indices of the search value in the array.
     *
     * @example
     * ```typescript
     * // Get all indices of the value in 'searchVal' field in the 'myArray' field.
     * field("myArray").arrayIndexOfAll(field("searchVal"));
     * ```
     *
     * @param search - An expression evaluating to the value to search for.
     * @returns A new `Expression` representing the indices.
     */
    arrayIndexOfAll(search: Expression): FunctionExpression;
    /**
     * Creates an expression that calculates the length of this string expression in bytes.
     *
     * @example
     * ```typescript
     * // Calculate the length of the 'myString' field in bytes.
     * field("myString").byteLength();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the length of the string in bytes.
     */
    byteLength(): FunctionExpression;
    /**
     * Creates an expression that computes the ceiling of a numeric value.
     *
     * @example
     * ```typescript
     * // Compute the ceiling of the 'price' field.
     * field("price").ceil();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the ceiling of the numeric value.
     */
    ceil(): FunctionExpression;
    /**
     * Creates an expression that computes the floor of a numeric value.
     *
     * @example
     * ```typescript
     * // Compute the floor of the 'price' field.
     * field("price").floor();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the floor of the numeric value.
     */
    floor(): FunctionExpression;
    /**
     * Creates an expression that computes the absolute value of a numeric value.
     *
     * @example
     * ```typescript
     * // Compute the absolute value of the 'price' field.
     * field("price").abs();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the absolute value of the numeric value.
     */
    abs(): FunctionExpression;
    /**
     * Creates an expression that computes e to the power of this expression.
     *
     * @example
     * ```typescript
     * // Compute e to the power of the 'value' field.
     * field("value").exp();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the exp of the numeric value.
     */
    exp(): FunctionExpression;
    /**
     * Accesses a value from a map (object) field using the provided key.
     *
     * @example
     * ```typescript
     * // Get the 'city' value from the 'address' map field
     * field("address").mapGet("city");
     * ```
     *
     * @param subfield - The key to access in the map.
     * @returns A new `Expression` representing the value associated with the given key in the map.
     */
    mapGet(subfield: string): FunctionExpression;
    /**
     * Creates an expression that returns a new map with the specified entries added or updated.
     *
     * @remarks
     * Note that `mapSet` only performs shallow updates to the map. Setting a value to `null`
     * will retain the key with a `null` value. To remove a key entirely, use `mapRemove`.
     *
     * @example
     * ```typescript
     * // Set the 'city' to "San Francisco" in the 'address' map
     * field("address").mapSet("city", "San Francisco");
     * ```
     *
     * @param key - The key to set. Must be a string or a constant string expression.
     * @param value - The value to set.
     * @param moreKeyValues - Additional key-value pairs to set.
     * @returns A new `Expression` representing the map with the entries set.
     */
    mapSet(key: string | Expression, value: unknown, ...moreKeyValues: unknown[]): FunctionExpression;
    /**
     * Creates an expression that returns the keys of a map.
     *
     * @remarks
     * While the backend generally preserves insertion order, relying on the
     * order of the output array is not guaranteed and should be avoided.
     *
     * @example
     * ```typescript
     * // Get the keys of the 'address' map
     * field("address").mapKeys();
     * ```
     *
     * @returns A new `Expression` representing the keys of the map.
     */
    mapKeys(): FunctionExpression;
    /**
     * Creates an expression that returns the values of a map.
     *
     * @remarks
     * While the backend generally preserves insertion order, relying on the
     * order of the output array is not guaranteed and should be avoided.
     *
     * @example
     * ```typescript
     * // Get the values of the 'address' map
     * field("address").mapValues();
     * ```
     *
     * @returns A new `Expression` representing the values of the map.
     */
    mapValues(): FunctionExpression;
    /**
     * Creates an expression that returns the entries of a map as an array of maps,
     * where each map contains a `"k"` property for the key and a `"v"` property for the value.
     * For example: `[{ k: "key1", v: "value1" }, ...]`.
     *
     * @example
     * ```typescript
     * // Get the entries of the 'address' map
     * field("address").mapEntries();
     * ```
     *
     * @returns A new `Expression` representing the entries of the map.
     */
    mapEntries(): FunctionExpression;
    /**
     * @public
     * Creates an expression that returns the value of a field from the document that results from the evaluation of this expression.
     *
     * @example
     * ```typescript
     * // Get the value of the "city" field in the "address" document.
     * field("address").getField("city")
     * ```
     *
     * @param key The field to access in the document.
     * @returns A new `Expression` representing the value of the field in the document.
     */
    getField(key: string | Expression): Expression;
    /**
     * Creates an aggregation that counts the number of stage inputs with valid evaluations of the
     * expression or field.
     *
     * @example
     * ```typescript
     * // Count the total number of products
     * field("productId").count().as("totalProducts");
     * ```
     *
     * @returns A new `AggregateFunction` representing the 'count' aggregation.
     */
    count(): AggregateFunction;
    /**
     * Creates an aggregation that calculates the sum of a numeric field across multiple stage inputs.
     *
     * @example
     * ```typescript
     * // Calculate the total revenue from a set of orders
     * field("orderAmount").sum().as("totalRevenue");
     * ```
     *
     * @returns A new `AggregateFunction` representing the 'sum' aggregation.
     */
    sum(): AggregateFunction;
    /**
     * Creates an aggregation that calculates the average (mean) of a numeric field across multiple
     * stage inputs.
     *
     * @example
     * ```typescript
     * // Calculate the average age of users
     * field("age").average().as("averageAge");
     * ```
     *
     * @returns A new `AggregateFunction` representing the 'average' aggregation.
     */
    average(): AggregateFunction;
    /**
     * Creates an aggregation that finds the minimum value of a field across multiple stage inputs.
     *
     * @example
     * ```typescript
     * // Find the lowest price of all products
     * field("price").minimum().as("lowestPrice");
     * ```
     *
     * @returns A new `AggregateFunction` representing the 'minimum' aggregation.
     */
    minimum(): AggregateFunction;
    /**
     * Creates an aggregation that finds the maximum value of a field across multiple stage inputs.
     *
     * @example
     * ```typescript
     * // Find the highest score in a leaderboard
     * field("score").maximum().as("highestScore");
     * ```
     *
     * @returns A new `AggregateFunction` representing the 'maximum' aggregation.
     */
    maximum(): AggregateFunction;
    /**
     * Creates an aggregation that finds the first value of an expression across multiple stage inputs.
     *
     * @example
     * ```typescript
     * // Find the first value of the 'rating' field
     * field("rating").first().as("firstRating");
     * ```
     *
     * @returns A new `AggregateFunction` representing the 'first' aggregation.
     */
    first(): AggregateFunction;
    /**
     * Creates an aggregation that finds the last value of an expression across multiple stage inputs.
     *
     * @example
     * ```typescript
     * // Find the last value of the 'rating' field
     * field("rating").last().as("lastRating");
     * ```
     *
     * @returns A new `AggregateFunction` representing the 'last' aggregation.
     */
    last(): AggregateFunction;
    /**
     * Creates an aggregation that collects all values of an expression across multiple stage inputs
     * into an array.
     *
     * @remarks
     * If the expression resolves to an absent value, it is converted to `null`.
     * The order of elements in the output array is not stable and shouldn't be relied upon.
     *
     * @example
     * ```typescript
     * // Collect all tags from books into an array
     * field("tags").arrayAgg().as("allTags");
     * ```
     *
     * @returns A new `AggregateFunction` representing the 'array_agg' aggregation.
     */
    arrayAgg(): AggregateFunction;
    /**
     * Creates an aggregation that collects all distinct values of an expression across multiple stage
     * inputs into an array.
     *
     * @remarks
     * If the expression resolves to an absent value, it is converted to `null`.
     * The order of elements in the output array is not stable and shouldn't be relied upon.
     *
     * @example
     * ```typescript
     * // Collect all distinct tags from books into an array
     * field("tags").arrayAggDistinct().as("allDistinctTags");
     * ```
     *
     * @returns A new `AggregateFunction` representing the 'array_agg_distinct' aggregation.
     */
    arrayAggDistinct(): AggregateFunction;
    /**
     * Creates an aggregation that counts the number of distinct values of the expression or field.
     *
     * @example
     * ```typescript
     * // Count the distinct number of products
     * field("productId").countDistinct().as("distinctProducts");
     * ```
     *
     * @returns A new `AggregateFunction` representing the 'count_distinct' aggregation.
     */
    countDistinct(): AggregateFunction;
    /**
     * Creates an expression that returns the larger value between this expression and another expression, based on Firestore's value type ordering.
     *
     * @example
     * ```typescript
     * // Returns the larger value between the 'timestamp' field and the current timestamp.
     * field("timestamp").logicalMaximum(currentTimestamp());
     * ```
     *
     * @param second - The second expression or literal to compare with.
     * @param others - Optional additional expressions or literals to compare with.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logical maximum operation.
     */
    logicalMaximum(second: Expression | unknown, ...others: Array<Expression | unknown>): FunctionExpression;
    /**
     * Creates an expression that returns the smaller value between this expression and another expression, based on Firestore's value type ordering.
     *
     * @example
     * ```typescript
     * // Returns the smaller value between the 'timestamp' field and the current timestamp.
     * field("timestamp").logicalMinimum(currentTimestamp());
     * ```
     *
     * @param second - The second expression or literal to compare with.
     * @param others - Optional additional expressions or literals to compare with.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logical minimum operation.
     */
    logicalMinimum(second: Expression | unknown, ...others: Array<Expression | unknown>): FunctionExpression;
    /**
     * Creates an expression that calculates the length (number of dimensions) of this Firestore Vector expression.
     *
     * @example
     * ```typescript
     * // Get the vector length (dimension) of the field 'embedding'.
     * field("embedding").vectorLength();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the length of the vector.
     */
    vectorLength(): FunctionExpression;
    /**
     * Calculates the cosine distance between two vectors.
     *
     * @example
     * ```typescript
     * // Calculate the cosine distance between the 'userVector' field and the 'itemVector' field
     * field("userVector").cosineDistance(field("itemVector"));
     * ```
     *
     * @param vectorExpression - The other vector (represented as an Expression) to compare against.
     * @returns A new `Expression` representing the cosine distance between the two vectors.
     */
    cosineDistance(vectorExpression: Expression): FunctionExpression;
    /**
     * Calculates the Cosine distance between two vectors.
     *
     * @example
     * ```typescript
     * // Calculate the Cosine distance between the 'location' field and a target location
     * field("location").cosineDistance(new VectorValue([37.7749, -122.4194]));
     * ```
     *
     * @param vector - The other vector (as a VectorValue) to compare against.
     * @returns A new `Expression` representing the Cosine* distance between the two vectors.
     */
    cosineDistance(vector: VectorValue | number[]): FunctionExpression;
    /**
     * Calculates the dot product between two vectors.
     *
     * @example
     * ```typescript
     * // Calculate the dot product between a feature vector and a target vector
     * field("features").dotProduct([0.5, 0.8, 0.2]);
     * ```
     *
     * @param vectorExpression - The other vector (as an array of numbers) to calculate with.
     * @returns A new `Expression` representing the dot product between the two vectors.
     */
    dotProduct(vectorExpression: Expression): FunctionExpression;
    /**
     * Calculates the dot product between two vectors.
     *
     * @example
     * ```typescript
     * // Calculate the dot product between a feature vector and a target vector
     * field("features").dotProduct(new VectorValue([0.5, 0.8, 0.2]));
     * ```
     *
     * @param vector - The other vector (as an array of numbers) to calculate with.
     * @returns A new `Expression` representing the dot product between the two vectors.
     */
    dotProduct(vector: VectorValue | number[]): FunctionExpression;
    /**
     * Calculates the Euclidean distance between two vectors.
     *
     * @example
     * ```typescript
     * // Calculate the Euclidean distance between the 'location' field and a target location
     * field("location").euclideanDistance([37.7749, -122.4194]);
     * ```
     *
     * @param vectorExpression - The other vector (as an array of numbers) to calculate with.
     * @returns A new `Expression` representing the Euclidean distance between the two vectors.
     */
    euclideanDistance(vectorExpression: Expression): FunctionExpression;
    /**
     * Calculates the Euclidean distance between two vectors.
     *
     * @example
     * ```typescript
     * // Calculate the Euclidean distance between the 'location' field and a target location
     * field("location").euclideanDistance(new VectorValue([37.7749, -122.4194]));
     * ```
     *
     * @param vector - The other vector (as a VectorValue) to compare against.
     * @returns A new `Expression` representing the Euclidean distance between the two vectors.
     */
    euclideanDistance(vector: VectorValue | number[]): FunctionExpression;
    /**
     * Creates an expression that interprets this expression as the number of microseconds since the Unix epoch (1970-01-01 00:00:00 UTC)
     * and returns a timestamp.
     *
     * @example
     * ```typescript
     * // Interpret the 'microseconds' field as microseconds since epoch.
     * field("microseconds").unixMicrosToTimestamp();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the timestamp.
     */
    unixMicrosToTimestamp(): FunctionExpression;
    /**
     * Creates an expression that converts this timestamp expression to the number of microseconds since the Unix epoch (1970-01-01 00:00:00 UTC).
     *
     * @example
     * ```typescript
     * // Convert the 'timestamp' field to microseconds since epoch.
     * field("timestamp").timestampToUnixMicros();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the number of microseconds since epoch.
     */
    timestampToUnixMicros(): FunctionExpression;
    /**
     * Creates an expression that interprets this expression as the number of milliseconds since the Unix epoch (1970-01-01 00:00:00 UTC)
     * and returns a timestamp.
     *
     * @example
     * ```typescript
     * // Interpret the 'milliseconds' field as milliseconds since epoch.
     * field("milliseconds").unixMillisToTimestamp();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the timestamp.
     */
    unixMillisToTimestamp(): FunctionExpression;
    /**
     * Creates an expression that converts this timestamp expression to the number of milliseconds since the Unix epoch (1970-01-01 00:00:00 UTC).
     *
     * @example
     * ```typescript
     * // Convert the 'timestamp' field to milliseconds since epoch.
     * field("timestamp").timestampToUnixMillis();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the number of milliseconds since epoch.
     */
    timestampToUnixMillis(): FunctionExpression;
    /**
     * Creates an expression that interprets this expression as the number of seconds since the Unix epoch (1970-01-01 00:00:00 UTC)
     * and returns a timestamp.
     *
     * @example
     * ```typescript
     * // Interpret the 'seconds' field as seconds since epoch.
     * field("seconds").unixSecondsToTimestamp();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the timestamp.
     */
    unixSecondsToTimestamp(): FunctionExpression;
    /**
     * Creates an expression that converts this timestamp expression to the number of seconds since the Unix epoch (1970-01-01 00:00:00 UTC).
     *
     * @example
     * ```typescript
     * // Convert the 'timestamp' field to seconds since epoch.
     * field("timestamp").timestampToUnixSeconds();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the number of seconds since epoch.
     */
    timestampToUnixSeconds(): FunctionExpression;
    /**
     * Creates an expression that adds a specified amount of time to this timestamp expression.
     *
     * @example
     * ```typescript
     * // Add some duration determined by field 'unit' and 'amount' to the 'timestamp' field.
     * field("timestamp").timestampAdd(field("unit"), field("amount"));
     * ```
     *
     * @param unit - The expression evaluates to unit of time, must be one of 'microsecond', 'millisecond', 'second', 'minute', 'hour', 'day'.
     * @param amount - The expression evaluates to amount of the unit.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the resulting timestamp.
     */
    timestampAdd(unit: Expression, amount: Expression): FunctionExpression;
    /**
     * Creates an expression that adds a specified amount of time to this timestamp expression.
     *
     * @example
     * ```typescript
     * // Add 1 day to the 'timestamp' field.
     * field("timestamp").timestampAdd("day", 1);
     * ```
     *
     * @param unit - The unit of time to add (e.g., "day", "hour").
     * @param amount - The amount of time to add.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the resulting timestamp.
     */
    timestampAdd(unit: TimeUnit, amount: number): FunctionExpression;
    /**
     * Creates an expression that subtracts a specified amount of time from this timestamp expression.
     *
     * @example
     * ```typescript
     * // Subtract some duration determined by field 'unit' and 'amount' from the 'timestamp' field.
     * field("timestamp").timestampSubtract(field("unit"), field("amount"));
     * ```
     *
     * @param unit - The expression evaluates to unit of time, must be one of 'microsecond', 'millisecond', 'second', 'minute', 'hour', 'day'.
     * @param amount - The expression evaluates to amount of the unit.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the resulting timestamp.
     */
    timestampSubtract(unit: Expression, amount: Expression): FunctionExpression;
    /**
     * Creates an expression that subtracts a specified amount of time from this timestamp expression.
     *
     * @example
     * ```typescript
     * // Subtract 1 day from the 'timestamp' field.
     * field("timestamp").timestampSubtract("day", 1);
     * ```
     *
     * @param unit - The unit of time to subtract (e.g., "day", "hour").
     * @param amount - The amount of time to subtract.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the resulting timestamp.
     */
    timestampSubtract(unit: TimeUnit, amount: number): FunctionExpression;
    /**
     * Creates an expression that calculates the difference between this timestamp and another timestamp.
     *
     * @example
     * ```typescript
     * // Calculate the difference determined by fields 'startTime' and 'unit'.
     * field("endTime").timestampDiff(field("startTime"), field("unit"));
     * ```
     *
     * @param start - The expression evaluating to the starting timestamp.
     * @param unit - The expression evaluates to a unit of time, must be one of 'microsecond', 'millisecond', 'second', 'minute', 'hour', 'day'.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the difference as an integer.
     */
    timestampDiff(start: Expression, unit: Expression): FunctionExpression;
    /**
     * Creates an expression that calculates the difference between this timestamp and another timestamp.
     *
     * @example
     * ```typescript
     * // Calculate the difference in days between 'endTime' and 'startTime' fields.
     * field("endTime").timestampDiff("startTime", "day");
     * ```
     *
     * @param start - The field name of the starting timestamp.
     * @param unit - The unit of time for the difference (e.g., "day", "hour").
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the difference as an integer.
     */
    timestampDiff(start: string | Expression, unit: TimeUnit): FunctionExpression;
    /**
     * Creates an expression that extracts a specified part from this timestamp expression.
     *
     * @example
     * ```typescript
     * // Extract the year from the 'createdAt' field.
     * field('createdAt').timestampExtract('year')
     * ```
     *
     * @param part - The part to extract from the timestamp (e.g., "year", "month", "day").
     * @param timezone - The timezone to use for extraction. Valid values are from
     * the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1."
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the extracted part as an integer.
     */
    timestampExtract(part: TimePart, timezone?: string | Expression): FunctionExpression;
    /**
     * Creates an expression that extracts a specified part from this timestamp expression.
     *
     * @example
     * ```typescript
     * // Extract the part specified by the field 'extractionPart' from 'createdAt'.
     * field('createdAt').timestampExtract(field('extractionPart'))
     * ```
     *
     * @param part - The expression evaluating to the part to extract.
     * @param timezone - The timezone to use for extraction. Valid values are from
     * the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1."
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the extracted part as an integer.
     */
    timestampExtract(part: Expression, timezone?: string | Expression): FunctionExpression;
    /**
     *
     * Creates an expression that returns the document ID from a path.
     *
     * @example
     * ```typescript
     * // Get the document ID from a path.
     * field("__path__").documentId();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the documentId operation.
     */
    documentId(): FunctionExpression;
    /**
     *
     * Creates an expression that returns the parent document reference of a document reference.
     *
     * @example
     * ```typescript
     * // Get the parent document reference of a document reference.
     * field("__path__").parent();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the parent operation.
     */
    parent(): FunctionExpression;
    /**
     *
     * Creates an expression that returns a substring of the results of this expression.
     *
     * @param position - Index of the first character of the substring.
     * @param length - Length of the substring. If not provided, the substring will
     * end at the end of the input.
     */
    substring(position: number, length?: number): FunctionExpression;
    /**
     *
     * Creates an expression that returns a substring of the results of this expression.
     *
     * @param position - An expression returning the index of the first character of the substring.
     * @param length - An expression returning the length of the substring. If not provided the
     * substring will end at the end of the input.
     */
    substring(position: Expression, length?: Expression): FunctionExpression;
    /**
     * Creates an expression that indexes into an array from the beginning or end
     * and returns the element. If the offset exceeds the array length, an error is
     * returned. A negative offset, starts from the end.
     *
     * @example
     * ```typescript
     * // Return the value in the 'tags' field array at index `1`.
     * field('tags').arrayGet(1);
     * ```
     *
     * @param offset - The index of the element to return.
     * @returns A new `Expression` representing the 'arrayGet' operation.
     */
    arrayGet(offset: number): FunctionExpression;
    /**
     * Creates an expression that indexes into an array from the beginning or end
     * and returns the element. If the offset exceeds the array length, an error is
     * returned. A negative offset, starts from the end.
     *
     * @example
     * ```typescript
     * // Return the value in the tags field array at index specified by field
     * // 'favoriteTag'.
     * field('tags').arrayGet(field('favoriteTag'));
     * ```
     *
     * @param offsetExpr - An `Expression` evaluating to the index of the element to return.
     * @returns A new `Expression` representing the 'arrayGet' operation.
     */
    arrayGet(offsetExpr: Expression): FunctionExpression;
    /**
     *
     * Creates an expression that checks if a given expression produces an error.
     *
     * @example
     * ```typescript
     * // Check if the result of a calculation is an error
     * field("title").arrayContains(1).isError();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#BooleanExpression} representing the 'isError' check.
     */
    isError(): BooleanExpression;
    /**
     *
     * Creates an expression that returns the result of the `catchExpr` argument
     * if there is an error, else return the result of this expression.
     *
     * @example
     * ```typescript
     * // Returns the first item in the title field arrays, or returns
     * // the entire title field if the array is empty or the field is another type.
     * field("title").arrayGet(0).ifError(field("title"));
     * ```
     *
     * @param catchExpr - The catch expression that will be evaluated and
     * returned if this expression produces an error.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ifError' operation.
     */
    ifError(catchExpr: Expression): FunctionExpression;
    /**
     *
     * Creates an expression that returns the `catch` argument if there is an
     * error, else return the result of this expression.
     *
     * @example
     * ```typescript
     * // Returns the first item in the title field arrays, or returns
     * // "Default Title"
     * field("title").arrayGet(0).ifError("Default Title");
     * ```
     *
     * @param catchValue - The value that will be returned if this expression
     * produces an error.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ifError' operation.
     */
    ifError(catchValue: unknown): FunctionExpression;
    /**
     *
     * Creates an expression that returns `true` if the result of this expression
     * is absent. Otherwise, returns `false` even if the value is `null`.
     *
     * @example
     * ```typescript
     * // Check if the field `value` is absent.
     * field("value").isAbsent();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#BooleanExpression} representing the 'isAbsent' check.
     */
    isAbsent(): BooleanExpression;
    /**
     *
     * Creates an expression that removes a key from the map produced by evaluating this expression.
     *
     * @example
     * ```
     * // Removes the key 'baz' from the input map.
     * map({foo: 'bar', baz: true}).mapRemove('baz');
     * ```
     *
     * @param key - The name of the key to remove from the input map.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'mapRemove' operation.
     */
    mapRemove(key: string): FunctionExpression;
    /**
     *
     * Creates an expression that removes a key from the map produced by evaluating this expression.
     *
     * @example
     * ```
     * // Removes the key 'baz' from the input map.
     * map({foo: 'bar', baz: true}).mapRemove(constant('baz'));
     * @example
     * ```
     *
     * @param keyExpr - An expression that produces the name of the key to remove from the input map.
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'mapRemove' operation.
     */
    mapRemove(keyExpr: Expression): FunctionExpression;
    /**
     *
     * Creates an expression that merges multiple map values.
     *
     * @example
     * ```
     * // Merges the map in the settings field with, a map literal, and a map in
     * // that is conditionally returned by another expression
     * field('settings').mapMerge({ enabled: true }, conditional(field('isAdmin'), { admin: true}, {})
     * ```
     *
     * @param secondMap - A required second map to merge. Represented as a literal or
     * an expression that returns a map.
     * @param otherMaps - Optional additional maps to merge. Each map is represented
     * as a literal or an expression that returns a map.
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'mapMerge' operation.
     */
    mapMerge(secondMap: Record<string, unknown> | Expression, ...otherMaps: Array<Record<string, unknown> | Expression>): FunctionExpression;
    /**
     * Creates an expression that returns the value of this expression raised to the power of another expression.
     *
     * @example
     * ```typescript
     * // Raise the value of the 'base' field to the power of the 'exponent' field.
     * field("base").pow(field("exponent"));
     * ```
     *
     * @param exponent - The expression to raise this expression to the power of.
     * @returns A new `Expression` representing the power operation.
     */
    pow(exponent: Expression): FunctionExpression;
    /**
     * Creates an expression that returns the value of this expression raised to the power of a constant value.
     *
     * @example
     * ```typescript
     * // Raise the value of the 'base' field to the power of 2.
     * field("base").pow(2);
     * ```
     *
     * @param exponent - The constant value to raise this expression to the power of.
     * @returns A new `Expression` representing the power operation.
     */
    pow(exponent: number): FunctionExpression;
    /**
     * Creates an expression that truncates the numeric value to an integer.
     *
     * @example
     * ```typescript
     * // Truncate the 'rating' field
     * field("rating").trunc();
     * ```
     *
     * @returns A new `Expression` representing the truncated value.
     */
    trunc(): FunctionExpression;
    /**
     * Creates an expression that truncates a numeric value to the specified number of decimal places.
     *
     * @example
     * ```typescript
     * // Truncate the value of the 'rating' field to two decimal places.
     * field("rating").trunc(2);
     * ```
     *
     * @param decimalPlaces - A constant specifying the truncation precision in decimal places.
     * @returns A new `Expression` representing the truncated value.
     */
    trunc(decimalPlaces: number): FunctionExpression;
    /**
     * Creates an expression that truncates a numeric value to the specified number of decimal places.
     *
     * @example
     * ```typescript
     * // Truncate the value of the 'rating' field to two decimal places.
     * field("rating").trunc(constant(2));
     * ```
     *
     * @param decimalPlaces - An expression specifying the truncation precision in decimal places.
     * @returns A new `Expression` representing the truncated value.
     */
    trunc(decimalPlaces: Expression): FunctionExpression;
    /**
     * Creates an expression that rounds a numeric value to the nearest whole number.
     *
     * @example
     * ```typescript
     * // Round the value of the 'price' field.
     * field("price").round();
     * ```
     *
     * @returns A new `Expression` representing the rounded value.
     */
    round(): FunctionExpression;
    /**
     * Creates an expression that rounds a numeric value to the specified number of decimal places.
     *
     * @example
     * ```typescript
     * // Round the value of the 'price' field to two decimal places.
     * field("price").round(2);
     * ```
     *
     * @param decimalPlaces - A constant specifying the rounding precision in decimal places.
     *
     * @returns A new `Expression` representing the rounded value.
     */
    round(decimalPlaces: number): FunctionExpression;
    /**
     * Creates an expression that rounds a numeric value to the specified number of decimal places.
     *
     * @example
     * ```typescript
     * // Round the value of the 'price' field to two decimal places.
     * field("price").round(constant(2));
     * ```
     *
     * @param decimalPlaces - An expression specifying the rounding precision in decimal places.
     *
     * @returns A new `Expression` representing the rounded value.
     */
    round(decimalPlaces: Expression): FunctionExpression;
    /**
     * Creates an expression that returns the collection ID from a path.
     *
     * @example
     * ```typescript
     * // Get the collection ID from a path.
     * field("__path__").collectionId();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the collectionId operation.
     */
    collectionId(): FunctionExpression;
    /**
     * Creates an expression that calculates the length of a string, array, map, vector, or bytes.
     *
     * @example
     * ```typescript
     * // Get the length of the 'name' field.
     * field("name").length();
     *
     * // Get the number of items in the 'cart' array.
     * field("cart").length();
     * ```
     *
     * @returns A new `Expression` representing the length of the string, array, map, vector, or bytes.
     */
    length(): FunctionExpression;
    /**
     * Creates an expression that computes the natural logarithm of a numeric value.
     *
     * @example
     * ```typescript
     * // Compute the natural logarithm of the 'value' field.
     * field("value").ln();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the natural logarithm of the numeric value.
     */
    ln(): FunctionExpression;
    /**
     * Creates an expression that computes the square root of a numeric value.
     *
     * @example
     * ```typescript
     * // Compute the square root of the 'value' field.
     * field("value").sqrt();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the square root of the numeric value.
     */
    sqrt(): FunctionExpression;
    /**
     * Creates an expression that reverses a string.
     *
     * @example
     * ```typescript
     * // Reverse the value of the 'myString' field.
     * field("myString").stringReverse();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the reversed string.
     */
    stringReverse(): FunctionExpression;
    /**
     * Creates an expression that returns the `elseValue` argument if this expression results in an absent value, else
     * return the result of this expression evaluation.
     *
     * @example
     * ```typescript
     * // Returns the value of the optional field 'optional_field', or returns 'default_value'
     * // if the field is absent.
     * field("optional_field").ifAbsent("default_value")
     * ```
     *
     * @param elseValue - The value that will be returned if this Expression evaluates to an absent value.
     * @returns A new [Expression] representing the ifAbsent operation.
     */
    ifAbsent(elseValue: unknown): Expression;
    /**
     * Creates an expression that returns the `elseValue` argument if this expression results in an absent value, else
     * return the result of this expression evaluation.
     *
     * @example
     * ```typescript
     * // Returns the value of the optional field 'optional_field', or if that is
     * // absent, then returns the value of the field `default_field`.
     * field("optional_field").ifAbsent(field('default_field'))
     * ```
     *
     * @param elseExpression - The Expression that will be evaluated if this Expression evaluates to an absent value.
     * @returns A new [Expression] representing the ifAbsent operation.
     */
    ifAbsent(elseExpression: unknown): Expression;
    /**
     * Creates an expression that returns the `elseValue` argument if this expression evaluates to null, else
     * return the result of this expression evaluation.
     *
     * @remarks
     * This function provides a fallback for both absent and explicit null values. In contrast,
     * `ifAbsent()` only triggers for missing fields.
     *
     * @example
     * ```typescript
     * // Returns the user's preferred name, or if that is null, returns their full name.
     * field("preferredName").ifNull(field("fullName"))
     * ```
     *
     * @param elseExpression - The Expression that will be evaluated if this Expression evaluates to null.
     * @returns A new `Expression` representing the ifNull operation.
     */
    ifNull(elseExpression: Expression): FunctionExpression;
    /**
     * Creates an expression that returns the `elseValue` argument if this expression evaluates to null, else
     * return the result of this expression evaluation.
     *
     * @remarks
     * This function provides a fallback for both absent and explicit null values. In contrast,
     * `ifAbsent()` only triggers for missing fields.
     *
     * @example
     * ```typescript
     * // Returns the user's display name, or returns "Anonymous" if the field is null.
     * field("displayName").ifNull("Anonymous")
     * ```
     *
     * @param elseValue - The value that will be returned if this Expression evaluates to null.
     * @returns A new `Expression` representing the ifNull operation.
     */
    ifNull(elseValue: unknown): FunctionExpression;
    /**
     * Creates an expression that returns the first non-null, non-absent argument, without evaluating
     * the rest of the arguments. When all arguments are null or absent, returns the last argument.
     *
     * @example
     * ```typescript
     * // Returns the value of the first non-null, non-absent field among 'preferredName', 'fullName',
     * // or the last argument if all previous fields are null.
     * field("preferredName").coalesce(field("fullName"), "Anonymous");
     * ```
     *
     * @param replacement - The value to use if this expression evaluates to null.
     * @param others - Optional additional values to check if previous values are null.
     * @returns A new `Expression` representing the coalesce operation.
     */
    coalesce(replacement: Expression | unknown, ...others: Array<Expression | unknown>): FunctionExpression;
    /**
     * Creates an expression that joins the elements of an array into a string.
     *
     * @example
     * ```typescript
     * // Join the elements of the 'tags' field with the delimiter from the 'separator' field.
     * field("tags").join(field("separator"))
     * ```
     *
     * @param delimiterExpression - The expression that evaluates to the delimiter string.
     * @returns A new Expression representing the join operation.
     */
    join(delimiterExpression: Expression): Expression;
    /**
     * Creates an expression that joins the elements of an array field into a string.
     *
     * @example
     * ```typescript
     * // Join the elements of the 'tags' field with a comma and space.
     * field("tags").join(", ")
     * ```
     *
     * @param delimiter - The string to use as a delimiter.
     * @returns A new Expression representing the join operation.
     */
    join(delimiter: string): Expression;
    /**
     * Creates an expression that computes the base-10 logarithm of a numeric value.
     *
     * @example
     * ```typescript
     * // Compute the base-10 logarithm of the 'value' field.
     * field("value").log10();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the base-10 logarithm of the numeric value.
     */
    log10(): FunctionExpression;
    /**
     * Creates an expression that computes the sum of the elements in an array.
     *
     * @example
     * ```typescript
     * // Compute the sum of the elements in the 'scores' field.
     * field("scores").arraySum();
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the sum of the elements in the array.
     */
    arraySum(): FunctionExpression;
    /**
     * Creates an expression that splits the result of this expression into an
     * array of substrings based on the provided delimiter.
     *
     * @example
     * ```typescript
     * // Split the 'scoresCsv' field on delimiter ','
     * field('scoresCsv').split(',')
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the split function.
     */
    split(delimiter: string): FunctionExpression;
    /**
     * Creates an expression that splits the result of this expression into an
     * array of substrings based on the provided delimiter.
     *
     * @example
     * ```typescript
     * // Split the 'scores' field on delimiter ',' or ':' depending on the stored format
     * field('scores').split(conditional(field('format').equal('csv'), constant(','), constant(':')))
     * ```
     *
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the split function.
     */
    split(delimiter: Expression): FunctionExpression;
    /**
     * Creates an expression that truncates a timestamp to a specified granularity.
     *
     * @example
     * ```typescript
     * // Truncate the 'createdAt' timestamp to the beginning of the day.
     * field('createdAt').timestampTruncate('day')
     * ```
     *
     * @param granularity - The granularity to truncate to.
     * @param timezone - The timezone to use for truncation. Valid values are from
     * the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1".
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the truncated timestamp.
     */
    timestampTruncate(granularity: TimeGranularity, timezone?: string | Expression): FunctionExpression;
    /**
     * Creates an expression that truncates a timestamp to a specified granularity.
     *
     * @example
     * ```typescript
     * // Truncate the 'createdAt' timestamp to the granularity specified in the field 'granularity'.
     * field('createdAt').timestampTruncate(field('granularity'))
     * ```
     *
     * @param granularity - The granularity to truncate to.
     * @param timezone - The timezone to use for truncation. Valid values are from
     * the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1".
     * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the truncated timestamp.
     */
    timestampTruncate(granularity: Expression, timezone?: string | Expression): FunctionExpression;
    /**
     * Creates an {@link @firebase/firestore/pipelines#Ordering} that sorts documents in ascending order based on this expression.
     *
     * @example
     * ```typescript
     * // Sort documents by the 'name' field in ascending order
     * firestore.pipeline().collection("users")
     *   .sort(field("name").ascending());
     * ```
     *
     * @returns A new `Ordering` for ascending sorting.
     */
    ascending(): Ordering;
    /**
     * Creates an {@link @firebase/firestore/pipelines#Ordering} that sorts documents in descending order based on this expression.
     *
     * @example
     * ```typescript
     * // Sort documents by the 'createdAt' field in descending order
     * firestore.pipeline().collection("users")
     *   .sort(field("createdAt").descending());
     * ```
     *
     * @returns A new `Ordering` for descending sorting.
     */
    descending(): Ordering;
    /**
     * Assigns an alias to this expression.
     *
     * Aliases are useful for renaming fields in the output of a stage or for giving meaningful
     * names to calculated values.
     *
     * @example
     * ```typescript
     * // Calculate the total price and assign it the alias "totalPrice" and add it to the output.
     * firestore.pipeline().collection("items")
     *   .addFields(field("price").multiply(field("quantity")).as("totalPrice"));
     * ```
     *
     * @param name - The alias to assign to this expression.
     * @returns A new {@link @firebase/firestore/pipelines#AliasedExpression} that wraps this
     *     expression and associates it with the provided alias.
     */
    as(name: string): AliasedExpression;
}

/**
 *
 * An enumeration of the different types of expressions.
 */
export declare type ExpressionType = 'Field' | 'Constant' | 'Function' | 'AggregateFunction' | 'ListOfExpressions' | 'AliasedExpression' | 'Variable' | 'PipelineValue';

/**
 *
 * Represents a reference to a field in a Firestore document, or outputs of a {@link @firebase/firestore/pipelines#Pipeline} stage.
 *
 * <p>Field references are used to access document field values in expressions and to specify fields
 * for sorting, filtering, and projecting data in Firestore pipelines.
 *
 * <p>You can create a `Field` instance using the static {@link @firebase/firestore/pipelines#field} method:
 *
 * @example
 * ```typescript
 * // Create a Field instance for the 'name' field
 * const nameField = field("name");
 *
 * // Create a Field instance for a nested field 'address.city'
 * const cityField = field("address.city");
 * ```
 */
export declare class Field extends Expression implements Selectable {
    private fieldPath;
    readonly _methodName: string | undefined;
    readonly expressionType: ExpressionType;
    selectable: true;
    /**
     * @internal
     * @private
     * @hideconstructor
     * @param fieldPath
     */
    constructor(fieldPath: FieldPath_2, _methodName: string | undefined);
    get _fieldPath(): FieldPath_2;
    get fieldName(): string;
    get alias(): string;
    get expr(): Expression;
    /**
     * @beta
     * Evaluates to the distance in meters between the location specified
     * by this field and the query location.
     *
     * @remarks This Expression can only be used within a `search` stage.
     *
     * @param location - Compute distance to this GeoPoint.
     */
    geoDistance(location: GeoPoint | Expression): Expression;
    /**
     * @private
     * @internal
     */
    _toProto(serializer: JsonProtoSerializer): Value;
    /**
     * @private
     * @internal
     */
    _readUserData(context: ParseContext): void;
}

/**
 * Creates a {@link @firebase/firestore/pipelines#Field} instance representing the field at the given path.
 *
 * The path can be a simple field name (e.g., "name") or a dot-separated path to a nested field
 * (e.g., "address.city").
 *
 * @example
 * ```typescript
 * // Create a Field instance for the 'title' field
 * const titleField = field("title");
 *
 * // Create a Field instance for a nested field 'author.firstName'
 * const authorFirstNameField = field("author.firstName");
 * ```
 *
 * @param name - The path to the field.
 * @returns A new {@link @firebase/firestore/pipelines#Field} instance representing the specified field.
 */
export declare function field(name: string): Field;

/**
 * Creates a {@link @firebase/firestore/pipelines#Field} instance representing the field at the given path.
 *
 * @param path - A FieldPath specifying the field.
 * @returns A new {@link @firebase/firestore/pipelines#Field} instance representing the specified field.
 */
export declare function field(path: FieldPath): Field;

declare class FieldFilter extends Filter {
    readonly field: FieldPath_2;
    readonly op: Operator;
    readonly value: Value;
    protected constructor(field: FieldPath_2, op: Operator, value: Value);
    /**
     * Creates a filter based on the provided arguments.
     */
    static create(field: FieldPath_2, op: Operator, value: Value): FieldFilter;
    private static createKeyFieldInFilter;
    matches(doc: Document_2): boolean;
    protected matchesComparison(comparison: number): boolean;
    isInequality(): boolean;
    getFlattenedFilters(): readonly FieldFilter[];
    getFilters(): Filter[];
}

declare type FieldFilterOp = 'OPERATOR_UNSPECIFIED' | 'LESS_THAN' | 'LESS_THAN_OR_EQUAL' | 'GREATER_THAN' | 'GREATER_THAN_OR_EQUAL' | 'EQUAL' | 'NOT_EQUAL' | 'ARRAY_CONTAINS' | 'IN' | 'ARRAY_CONTAINS_ANY' | 'NOT_IN';

/**
 * An index definition for field indexes in Firestore.
 *
 * Every index is associated with a collection. The definition contains a list
 * of fields and their index kind (which can be `ASCENDING`, `DESCENDING` or
 * `CONTAINS` for ArrayContains/ArrayContainsAny queries).
 *
 * Unlike the backend, the SDK does not differentiate between collection or
 * collection group-scoped indices. Every index can be used for both single
 * collection and collection group queries.
 */
declare class FieldIndex {
    /**
     * The index ID. Returns -1 if the index ID is not available (e.g. the index
     * has not yet been persisted).
     */
    readonly indexId: number;
    /** The collection ID this index applies to. */
    readonly collectionGroup: string;
    /** The field segments for this index. */
    readonly fields: IndexSegment[];
    /** Shows how up-to-date the index is for the current user. */
    readonly indexState: IndexState;
    /** An ID for an index that has not yet been added to persistence.  */
    static UNKNOWN_ID: number;
    constructor(
    /**
     * The index ID. Returns -1 if the index ID is not available (e.g. the index
     * has not yet been persisted).
     */
    indexId: number, 
    /** The collection ID this index applies to. */
    collectionGroup: string, 
    /** The field segments for this index. */
    fields: IndexSegment[], 
    /** Shows how up-to-date the index is for the current user. */
    indexState: IndexState);
}

/**
 * Provides a set of fields that can be used to partially patch a document.
 * FieldMask is used in conjunction with ObjectValue.
 * Examples:
 *   foo - Overwrites foo entirely with the provided value. If foo is not
 *         present in the companion ObjectValue, the field is deleted.
 *   foo.bar - Overwrites only the field bar of the object foo.
 *             If foo is not an object, foo is replaced with an object
 *             containing foo
 */
declare class FieldMask {
    readonly fields: FieldPath_2[];
    constructor(fields: FieldPath_2[]);
    static empty(): FieldMask;
    /**
     * Returns a new FieldMask object that is the result of adding all the given
     * fields paths to this field mask.
     */
    unionWith(extraFields: FieldPath_2[]): FieldMask;
    /**
     * Verifies that `fieldPath` is included by at least one field in this field
     * mask.
     *
     * This is an O(n) operation, where `n` is the size of the field mask.
     */
    covers(fieldPath: FieldPath_2): boolean;
    isEqual(other: FieldMask): boolean;
}

/**
 * A `FieldPath` refers to a field in a document. The path may consist of a
 * single field name (referring to a top-level field in the document), or a
 * list of field names (referring to a nested field in the document).
 *
 * Create a `FieldPath` by providing field names. If more than one field
 * name is provided, the path will point to a nested field in a document.
 */
export declare class FieldPath {
    /** Internal representation of a Firestore field path. */
    readonly _internalPath: FieldPath_2;
    /**
     * Creates a `FieldPath` from the provided field names. If more than one field
     * name is provided, the path will point to a nested field in a document.
     *
     * @param fieldNames - A list of field names.
     */
    constructor(...fieldNames: string[]);
    /**
     * Returns true if this `FieldPath` is equal to the provided one.
     *
     * @param other - The `FieldPath` to compare against.
     * @returns true if this `FieldPath` is equal to the provided one.
     */
    isEqual(other: FieldPath): boolean;
}

/**
 * A dot-separated path for navigating sub-objects within a document.
 * @internal
 */
declare class FieldPath_2 extends BasePath<FieldPath_2> {
    protected construct(segments: string[], offset?: number, length?: number): FieldPath_2;
    /**
     * Returns true if the string could be used as a segment in a field path
     * without escaping.
     */
    private static isValidIdentifier;
    canonicalString(): string;
    toString(): string;
    /**
     * Returns true if this field references the key of a document.
     */
    isKeyField(): boolean;
    /**
     * The field designating the key of a document.
     */
    static keyField(): FieldPath_2;
    /**
     * Parses a field string from the given server-formatted string.
     *
     * - Splitting the empty string is not allowed (for now at least).
     * - Empty segments within the string (e.g. if there are two consecutive
     *   separators) are not allowed.
     *
     * TODO(b/37244157): we should make this more strict. Right now, it allows
     * non-identifier path components, even if they aren't escaped.
     */
    static fromServerFormat(path: string): FieldPath_2;
    static emptyPath(): FieldPath_2;
}

/** A field path and the TransformOperation to perform upon it. */
declare class FieldTransform {
    readonly field: FieldPath_2;
    readonly transform: TransformOperation;
    constructor(field: FieldPath_2, transform: TransformOperation);
}

declare type FieldTransformSetToServerValue = 'SERVER_VALUE_UNSPECIFIED' | 'REQUEST_TIME';

/**
 * Sentinel values that can be used when writing document fields with `set()`
 * or `update()`.
 */
export declare abstract class FieldValue {
    _methodName: string;
    /**
     * @param _methodName - The public API endpoint that returns this class.
     * @hideconstructor
     */
    constructor(_methodName: string);
    /** Compares `FieldValue`s for equality. */
    abstract isEqual(other: FieldValue): boolean;
    abstract _toFieldTransform(context: ParseContext): FieldTransform | null;
}

declare abstract class Filter {
    abstract matches(doc: Document_2): boolean;
    abstract getFlattenedFilters(): readonly FieldFilter[];
    abstract getFilters(): Filter[];
}

/**
 * Options defining how a FindNearestStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(findNearest:1)}.
 */
export declare type FindNearestStageOptions = StageOptions & {
    /**
     * Specifies the field to be used. This can be a string representing the field path
     * (e.g., 'fieldName', 'nested.fieldName') or an object of type {@link @firebase/firestore/pipelines#Field}
     * representing a more complex field expression.
     */
    field: Field | string;
    /**
     * Specifies the query vector value, to which the vector distance will be computed.
     */
    vectorValue: VectorValue | number[];
    /**
     * Specifies the method used to compute the distance between vectors.
     *
     * Possible values are:
     * - `'euclidean'`: Euclidean distance.
     * - `'cosine'`: Cosine similarity.
     * - `'dot_product'`: Dot product.
     */
    distanceMeasure: 'euclidean' | 'cosine' | 'dot_product';
    /**
     * The maximum number of documents to return from the FindNearest stage.
     */
    limit?: number;
    /**
     * If set, specifies the field on the output documents that will contain
     * the computed vector distance for the document. If not set, the computed
     * vector distance will not be returned.
     */
    distanceField?: string;
};

/**
 * The Cloud Firestore service interface.
 *
 * Do not call this constructor directly. Instead, use {@link (getFirestore:1)}.
 */
export declare class Firestore extends Firestore_2 {
    /**
     * Whether it's a {@link Firestore} or Firestore Lite instance.
     */
    type: 'firestore-lite' | 'firestore';
    _queue: AsyncQueue;
    readonly _persistenceKey: string;
    _firestoreClient: FirestoreClient | undefined;
    _componentsProvider?: {
        _offline: OfflineComponentProviderFactory;
        _online: OnlineComponentProviderFactory;
    };
    /** @hideconstructor */
    constructor(authCredentialsProvider: CredentialsProvider<User>, appCheckCredentialsProvider: CredentialsProvider<string>, databaseId: DatabaseId, app?: FirebaseApp);
    protected _terminate(): Promise<void>;
}

/**
 * The Cloud Firestore service interface.
 *
 * Do not call this constructor directly. Instead, use {@link (getFirestore:1)}.
 */
declare class Firestore_2 implements FirestoreService {
    _authCredentials: CredentialsProvider<User>;
    _appCheckCredentials: CredentialsProvider<string>;
    readonly _databaseId: DatabaseId;
    readonly _app?: FirebaseApp | undefined;
    /**
     * Whether it's a Firestore or Firestore Lite instance.
     */
    type: 'firestore-lite' | 'firestore';
    readonly _persistenceKey: string;
    private _settings;
    private _settingsFrozen;
    private _emulatorOptions;
    private _terminateTask;
    /** @hideconstructor */
    constructor(_authCredentials: CredentialsProvider<User>, _appCheckCredentials: CredentialsProvider<string>, _databaseId: DatabaseId, _app?: FirebaseApp | undefined);
    /**
     * The {@link @firebase/app#FirebaseApp} associated with this `Firestore` service
     * instance.
     */
    get app(): FirebaseApp;
    get _initialized(): boolean;
    get _terminated(): boolean;
    _setSettings(settings: PrivateSettings): void;
    _getSettings(): FirestoreSettingsImpl;
    _getEmulatorOptions(): {
        mockUserToken?: EmulatorMockTokenOptions | string;
    };
    _freezeSettings(): FirestoreSettingsImpl;
    _delete(): Promise<void>;
    _restart(): Promise<void>;
    /** Returns a JSON-serializable representation of this `Firestore` instance. */
    toJSON(): object;
    /**
     * Terminates all components used by this client. Subclasses can override
     * this method to clean up their own dependencies, but must also call this
     * method.
     *
     * Only ever called once.
     */
    protected _terminate(): Promise<void>;
}

/**
 * FirestoreClient is a top-level class that constructs and owns all of the //
 * pieces of the client SDK architecture. It is responsible for creating the //
 * async queue that is shared by all of the other components in the system. //
 */
declare class FirestoreClient {
    private authCredentials;
    private appCheckCredentials;
    /**
     * Asynchronous queue responsible for all of our internal processing. When
     * we get incoming work from the user (via public API) or the network
     * (incoming GRPC messages), we should always schedule onto this queue.
     * This ensures all of our work is properly serialized (e.g. we don't
     * start processing a new operation while the previous one is waiting for
     * an async I/O to complete).
     */
    asyncQueue: AsyncQueue;
    /**
     * Exposed for testing
     */
    _databaseInfo: DatabaseInfo;
    private user;
    private readonly clientId;
    private authCredentialListener;
    private appCheckCredentialListener;
    _uninitializedComponentsProvider?: {
        _offline: OfflineComponentProvider;
        _online: OnlineComponentProvider;
    };
    _offlineComponents?: OfflineComponentProvider;
    _onlineComponents?: OnlineComponentProvider;
    constructor(authCredentials: CredentialsProvider<User>, appCheckCredentials: CredentialsProvider<string>, 
    /**
     * Asynchronous queue responsible for all of our internal processing. When
     * we get incoming work from the user (via public API) or the network
     * (incoming GRPC messages), we should always schedule onto this queue.
     * This ensures all of our work is properly serialized (e.g. we don't
     * start processing a new operation while the previous one is waiting for
     * an async I/O to complete).
     */
    asyncQueue: AsyncQueue, 
    /**
     * Exposed for testing
     */
    _databaseInfo: DatabaseInfo, componentProvider?: {
        _offline: OfflineComponentProvider;
        _online: OnlineComponentProvider;
    });
    get configuration(): ComponentConfiguration;
    setCredentialChangeListener(listener: (user: User) => Promise<void>): void;
    setAppCheckTokenChangeListener(listener: (appCheckToken: string, user: User) => Promise<void>): void;
    terminate(): Promise<void>;
}

/**
 * Converter used by `withConverter()` to transform user objects of type
 * `AppModelType` into Firestore data of type `DbModelType`.
 *
 * Using the converter allows you to specify generic type arguments when
 * storing and retrieving objects from Firestore.
 *
 * In this context, an "AppModel" is a class that is used in an application to
 * package together related information and functionality. Such a class could,
 * for example, have properties with complex, nested data types, properties used
 * for memoization, properties of types not supported by Firestore (such as
 * `symbol` and `bigint`), and helper functions that perform compound
 * operations. Such classes are not suitable and/or possible to store into a
 * Firestore database. Instead, instances of such classes need to be converted
 * to "plain old JavaScript objects" (POJOs) with exclusively primitive
 * properties, potentially nested inside other POJOs or arrays of POJOs. In this
 * context, this type is referred to as the "DbModel" and would be an object
 * suitable for persisting into Firestore. For convenience, applications can
 * implement `FirestoreDataConverter` and register the converter with Firestore
 * objects, such as `DocumentReference` or `Query`, to automatically convert
 * `AppModel` to `DbModel` when storing into Firestore, and convert `DbModel`
 * to `AppModel` when retrieving from Firestore.
 *
 * @example
 *
 * Simple Example
 *
 * ```typescript
 * const numberConverter = {
 *     toFirestore(value: WithFieldValue<number>) {
 *         return { value };
 *     },
 *     fromFirestore(snapshot: QueryDocumentSnapshot, options: SnapshotOptions) {
 *         return snapshot.data(options).value as number;
 *     }
 * };
 *
 * async function simpleDemo(db: Firestore): Promise<void> {
 *     const documentRef = doc(db, 'values/value123').withConverter(numberConverter);
 *
 *     // converters are used with `setDoc`, `addDoc`, and `getDoc`
 *     await setDoc(documentRef, 42);
 *     const snapshot1 = await getDoc(documentRef);
 *     assertEqual(snapshot1.data(), 42);
 *
 *     // converters are not used when writing data with `updateDoc`
 *     await updateDoc(documentRef, { value: 999 });
 *     const snapshot2 = await getDoc(documentRef);
 *     assertEqual(snapshot2.data(), 999);
 * }
 * ```
 *
 * Advanced Example
 *
 * ```typescript
 * // The Post class is a model that is used by our application.
 * // This class may have properties and methods that are specific
 * // to our application execution, which do not need to be persisted
 * // to Firestore.
 * class Post {
 *     constructor(
 *         readonly title: string,
 *         readonly author: string,
 *         readonly lastUpdatedMillis: number
 *     ) {}
 *     toString(): string {
 *         return `${this.title} by ${this.author}`;
 *     }
 * }
 *
 * // The PostDbModel represents how we want our posts to be stored
 * // in Firestore. This DbModel has different properties (`ttl`,
 * // `aut`, and `lut`) from the Post class we use in our application.
 * interface PostDbModel {
 *     ttl: string;
 *     aut: { firstName: string; lastName: string };
 *     lut: Timestamp;
 * }
 *
 * // The `PostConverter` implements `FirestoreDataConverter` and specifies
 * // how the Firestore SDK can convert `Post` objects to `PostDbModel`
 * // objects and vice versa.
 * class PostConverter implements FirestoreDataConverter<Post, PostDbModel> {
 *     toFirestore(post: WithFieldValue<Post>): WithFieldValue<PostDbModel> {
 *         return {
 *             ttl: post.title,
 *             aut: this._autFromAuthor(post.author),
 *             lut: this._lutFromLastUpdatedMillis(post.lastUpdatedMillis)
 *         };
 *     }
 *
 *     fromFirestore(snapshot: QueryDocumentSnapshot, options: SnapshotOptions): Post {
 *         const data = snapshot.data(options) as PostDbModel;
 *         const author = `${data.aut.firstName} ${data.aut.lastName}`;
 *         return new Post(data.ttl, author, data.lut.toMillis());
 *     }
 *
 *     _autFromAuthor(
 *         author: string | FieldValue
 *     ): { firstName: string; lastName: string } | FieldValue {
 *         if (typeof author !== 'string') {
 *             // `author` is a FieldValue, so just return it.
 *             return author;
 *         }
 *         const [firstName, lastName] = author.split(' ');
 *         return {firstName, lastName};
 *     }
 *
 *     _lutFromLastUpdatedMillis(
 *         lastUpdatedMillis: number | FieldValue
 *     ): Timestamp | FieldValue {
 *         if (typeof lastUpdatedMillis !== 'number') {
 *             // `lastUpdatedMillis` must be a FieldValue, so just return it.
 *             return lastUpdatedMillis;
 *         }
 *         return Timestamp.fromMillis(lastUpdatedMillis);
 *     }
 * }
 *
 * async function advancedDemo(db: Firestore): Promise<void> {
 *     // Create a `DocumentReference` with a `FirestoreDataConverter`.
 *     const documentRef = doc(db, 'posts/post123').withConverter(new PostConverter());
 *
 *     // The `data` argument specified to `setDoc()` is type checked by the
 *     // TypeScript compiler to be compatible with `Post`. Since the `data`
 *     // argument is typed as `WithFieldValue<Post>` rather than just `Post`,
 *     // this allows properties of the `data` argument to also be special
 *     // Firestore values that perform server-side mutations, such as
 *     // `arrayRemove()`, `deleteField()`, and `serverTimestamp()`.
 *     await setDoc(documentRef, {
 *         title: 'My Life',
 *         author: 'Foo Bar',
 *         lastUpdatedMillis: serverTimestamp()
 *     });
 *
 *     // The TypeScript compiler will fail to compile if the `data` argument to
 *     // `setDoc()` is _not_ compatible with `WithFieldValue<Post>`. This
 *     // type checking prevents the caller from specifying objects with incorrect
 *     // properties or property values.
 *     // @ts-expect-error "Argument of type { ttl: string; } is not assignable
 *     // to parameter of type WithFieldValue<Post>"
 *     await setDoc(documentRef, { ttl: 'The Title' });
 *
 *     // When retrieving a document with `getDoc()` the `DocumentSnapshot`
 *     // object's `data()` method returns a `Post`, rather than a generic object,
 *     // which would have been returned if the `DocumentReference` did _not_ have a
 *     // `FirestoreDataConverter` attached to it.
 *     const snapshot1: DocumentSnapshot<Post> = await getDoc(documentRef);
 *     const post1: Post = snapshot1.data()!;
 *     if (post1) {
 *         assertEqual(post1.title, 'My Life');
 *         assertEqual(post1.author, 'Foo Bar');
 *     }
 *
 *     // The `data` argument specified to `updateDoc()` is type checked by the
 *     // TypeScript compiler to be compatible with `PostDbModel`. Note that
 *     // unlike `setDoc()`, whose `data` argument must be compatible with `Post`,
 *     // the `data` argument to `updateDoc()` must be compatible with
 *     // `PostDbModel`. Similar to `setDoc()`, since the `data` argument is typed
 *     // as `WithFieldValue<PostDbModel>` rather than just `PostDbModel`, this
 *     // allows properties of the `data` argument to also be those special
 *     // Firestore values, like `arrayRemove()`, `deleteField()`, and
 *     // `serverTimestamp()`.
 *     await updateDoc(documentRef, {
 *         'aut.firstName': 'NewFirstName',
 *         lut: serverTimestamp()
 *     });
 *
 *     // The TypeScript compiler will fail to compile if the `data` argument to
 *     // `updateDoc()` is _not_ compatible with `WithFieldValue<PostDbModel>`.
 *     // This type checking prevents the caller from specifying objects with
 *     // incorrect properties or property values.
 *     // @ts-expect-error "Argument of type { title: string; } is not assignable
 *     // to parameter of type WithFieldValue<PostDbModel>"
 *     await updateDoc(documentRef, { title: 'New Title' });
 *     const snapshot2: DocumentSnapshot<Post> = await getDoc(documentRef);
 *     const post2: Post = snapshot2.data()!;
 *     if (post2) {
 *         assertEqual(post2.title, 'My Life');
 *         assertEqual(post2.author, 'NewFirstName Bar');
 *     }
 * }
 * ```
 */
export declare interface FirestoreDataConverter<AppModelType, DbModelType extends DocumentData = DocumentData> extends FirestoreDataConverter_2<AppModelType, DbModelType> {
    /**
     * Called by the Firestore SDK to convert a custom model object of type
     * `AppModelType` into a plain JavaScript object (suitable for writing
     * directly to the Firestore database) of type `DbModelType`. To use `set()`
     * with `merge` and `mergeFields`, `toFirestore()` must be defined with
     * `PartialWithFieldValue<AppModelType>`.
     *
     * The `WithFieldValue<T>` type extends `T` to also allow FieldValues such as
     * {@link (deleteField:1)} to be used as property values.
     */
    toFirestore(modelObject: WithFieldValue<AppModelType>): WithFieldValue<DbModelType>;
    /**
     * Called by the Firestore SDK to convert a custom model object of type
     * `AppModelType` into a plain JavaScript object (suitable for writing
     * directly to the Firestore database) of type `DbModelType`. Used with
     * {@link (setDoc:1)}, {@link (WriteBatch.set:1)} and
     * {@link (Transaction.set:1)} with `merge:true` or `mergeFields`.
     *
     * The `PartialWithFieldValue<T>` type extends `Partial<T>` to allow
     * FieldValues such as {@link (arrayUnion:1)} to be used as property values.
     * It also supports nested `Partial` by allowing nested fields to be
     * omitted.
     */
    toFirestore(modelObject: PartialWithFieldValue<AppModelType>, options: SetOptions): PartialWithFieldValue<DbModelType>;
    /**
     * Called by the Firestore SDK to convert Firestore data into an object of
     * type `AppModelType`. You can access your data by calling:
     * `snapshot.data(options)`.
     *
     * Generally, the data returned from `snapshot.data()` can be cast to
     * `DbModelType`; however, this is not guaranteed because Firestore does not
     * enforce a schema on the database. For example, writes from a previous
     * version of the application or writes from another client that did not use a
     * type converter could have written data with different properties and/or
     * property types. The implementation will need to choose whether to
     * gracefully recover from non-conforming data or throw an error.
     *
     * To override this method, see {@link (FirestoreDataConverter.fromFirestore:1)}.
     *
     * @param snapshot - A `QueryDocumentSnapshot` containing your data and metadata.
     * @param options - The `SnapshotOptions` from the initial call to `data()`.
     */
    fromFirestore(snapshot: QueryDocumentSnapshot<DocumentData, DocumentData>, options?: SnapshotOptions): AppModelType;
}

/**
 * Converter used by `withConverter()` to transform user objects of type
 * `AppModelType` into Firestore data of type `DbModelType`.
 *
 * Using the converter allows you to specify generic type arguments when
 * storing and retrieving objects from Firestore.
 *
 * In this context, an "AppModel" is a class that is used in an application to
 * package together related information and functionality. Such a class could,
 * for example, have properties with complex, nested data types, properties used
 * for memoization, properties of types not supported by Firestore (such as
 * `symbol` and `bigint`), and helper functions that perform compound
 * operations. Such classes are not suitable and/or possible to store into a
 * Firestore database. Instead, instances of such classes need to be converted
 * to "plain old JavaScript objects" (POJOs) with exclusively primitive
 * properties, potentially nested inside other POJOs or arrays of POJOs. In this
 * context, this type is referred to as the "DbModel" and would be an object
 * suitable for persisting into Firestore. For convenience, applications can
 * implement `FirestoreDataConverter` and register the converter with Firestore
 * objects, such as `DocumentReference` or `Query`, to automatically convert
 * `AppModel` to `DbModel` when storing into Firestore, and convert `DbModel`
 * to `AppModel` when retrieving from Firestore.
 *
 * @example
 *
 * Simple Example
 *
 * ```typescript
 * const numberConverter = {
 *     toFirestore(value: WithFieldValue<number>) {
 *         return { value };
 *     },
 *     fromFirestore(snapshot: QueryDocumentSnapshot, options: SnapshotOptions) {
 *         return snapshot.data(options).value as number;
 *     }
 * };
 *
 * async function simpleDemo(db: Firestore): Promise<void> {
 *     const documentRef = doc(db, 'values/value123').withConverter(numberConverter);
 *
 *     // converters are used with `setDoc`, `addDoc`, and `getDoc`
 *     await setDoc(documentRef, 42);
 *     const snapshot1 = await getDoc(documentRef);
 *     assertEqual(snapshot1.data(), 42);
 *
 *     // converters are not used when writing data with `updateDoc`
 *     await updateDoc(documentRef, { value: 999 });
 *     const snapshot2 = await getDoc(documentRef);
 *     assertEqual(snapshot2.data(), 999);
 * }
 * ```
 *
 * Advanced Example
 *
 * ```typescript
 * // The Post class is a model that is used by our application.
 * // This class may have properties and methods that are specific
 * // to our application execution, which do not need to be persisted
 * // to Firestore.
 * class Post {
 *     constructor(
 *         readonly title: string,
 *         readonly author: string,
 *         readonly lastUpdatedMillis: number
 *     ) {}
 *     toString(): string {
 *         return `${this.title} by ${this.author}`;
 *     }
 * }
 *
 * // The PostDbModel represents how we want our posts to be stored
 * // in Firestore. This DbModel has different properties (`ttl`,
 * // `aut`, and `lut`) from the Post class we use in our application.
 * interface PostDbModel {
 *     ttl: string;
 *     aut: { firstName: string; lastName: string };
 *     lut: Timestamp;
 * }
 *
 * // The `PostConverter` implements `FirestoreDataConverter` and specifies
 * // how the Firestore SDK can convert `Post` objects to `PostDbModel`
 * // objects and vice versa.
 * class PostConverter implements FirestoreDataConverter<Post, PostDbModel> {
 *     toFirestore(post: WithFieldValue<Post>): WithFieldValue<PostDbModel> {
 *         return {
 *             ttl: post.title,
 *             aut: this._autFromAuthor(post.author),
 *             lut: this._lutFromLastUpdatedMillis(post.lastUpdatedMillis)
 *         };
 *     }
 *
 *     fromFirestore(snapshot: QueryDocumentSnapshot, options: SnapshotOptions): Post {
 *         const data = snapshot.data(options) as PostDbModel;
 *         const author = `${data.aut.firstName} ${data.aut.lastName}`;
 *         return new Post(data.ttl, author, data.lut.toMillis());
 *     }
 *
 *     _autFromAuthor(
 *         author: string | FieldValue
 *     ): { firstName: string; lastName: string } | FieldValue {
 *         if (typeof author !== 'string') {
 *             // `author` is a FieldValue, so just return it.
 *             return author;
 *         }
 *         const [firstName, lastName] = author.split(' ');
 *         return {firstName, lastName};
 *     }
 *
 *     _lutFromLastUpdatedMillis(
 *         lastUpdatedMillis: number | FieldValue
 *     ): Timestamp | FieldValue {
 *         if (typeof lastUpdatedMillis !== 'number') {
 *             // `lastUpdatedMillis` must be a FieldValue, so just return it.
 *             return lastUpdatedMillis;
 *         }
 *         return Timestamp.fromMillis(lastUpdatedMillis);
 *     }
 * }
 *
 * async function advancedDemo(db: Firestore): Promise<void> {
 *     // Create a `DocumentReference` with a `FirestoreDataConverter`.
 *     const documentRef = doc(db, 'posts/post123').withConverter(new PostConverter());
 *
 *     // The `data` argument specified to `setDoc()` is type checked by the
 *     // TypeScript compiler to be compatible with `Post`. Since the `data`
 *     // argument is typed as `WithFieldValue<Post>` rather than just `Post`,
 *     // this allows properties of the `data` argument to also be special
 *     // Firestore values that perform server-side mutations, such as
 *     // `arrayRemove()`, `deleteField()`, and `serverTimestamp()`.
 *     await setDoc(documentRef, {
 *         title: 'My Life',
 *         author: 'Foo Bar',
 *         lastUpdatedMillis: serverTimestamp()
 *     });
 *
 *     // The TypeScript compiler will fail to compile if the `data` argument to
 *     // `setDoc()` is _not_ compatible with `WithFieldValue<Post>`. This
 *     // type checking prevents the caller from specifying objects with incorrect
 *     // properties or property values.
 *     // @ts-expect-error "Argument of type { ttl: string; } is not assignable
 *     // to parameter of type WithFieldValue<Post>"
 *     await setDoc(documentRef, { ttl: 'The Title' });
 *
 *     // When retrieving a document with `getDoc()` the `DocumentSnapshot`
 *     // object's `data()` method returns a `Post`, rather than a generic object,
 *     // which would have been returned if the `DocumentReference` did _not_ have a
 *     // `FirestoreDataConverter` attached to it.
 *     const snapshot1: DocumentSnapshot<Post> = await getDoc(documentRef);
 *     const post1: Post = snapshot1.data()!;
 *     if (post1) {
 *         assertEqual(post1.title, 'My Life');
 *         assertEqual(post1.author, 'Foo Bar');
 *     }
 *
 *     // The `data` argument specified to `updateDoc()` is type checked by the
 *     // TypeScript compiler to be compatible with `PostDbModel`. Note that
 *     // unlike `setDoc()`, whose `data` argument must be compatible with `Post`,
 *     // the `data` argument to `updateDoc()` must be compatible with
 *     // `PostDbModel`. Similar to `setDoc()`, since the `data` argument is typed
 *     // as `WithFieldValue<PostDbModel>` rather than just `PostDbModel`, this
 *     // allows properties of the `data` argument to also be those special
 *     // Firestore values, like `arrayRemove()`, `deleteField()`, and
 *     // `serverTimestamp()`.
 *     await updateDoc(documentRef, {
 *         'aut.firstName': 'NewFirstName',
 *         lut: serverTimestamp()
 *     });
 *
 *     // The TypeScript compiler will fail to compile if the `data` argument to
 *     // `updateDoc()` is _not_ compatible with `WithFieldValue<PostDbModel>`.
 *     // This type checking prevents the caller from specifying objects with
 *     // incorrect properties or property values.
 *     // @ts-expect-error "Argument of type { title: string; } is not assignable
 *     // to parameter of type WithFieldValue<PostDbModel>"
 *     await updateDoc(documentRef, { title: 'New Title' });
 *     const snapshot2: DocumentSnapshot<Post> = await getDoc(documentRef);
 *     const post2: Post = snapshot2.data()!;
 *     if (post2) {
 *         assertEqual(post2.title, 'My Life');
 *         assertEqual(post2.author, 'NewFirstName Bar');
 *     }
 * }
 * ```
 */
declare interface FirestoreDataConverter_2<AppModelType, DbModelType extends DocumentData = DocumentData> {
    /**
     * Called by the Firestore SDK to convert a custom model object of type
     * `AppModelType` into a plain JavaScript object (suitable for writing
     * directly to the Firestore database) of type `DbModelType`. Used with
     * {@link @firebase/firestore/lite#(setDoc:1)},
     * {@link @firebase/firestore/lite#(WriteBatch.set:1)} and
     * {@link @firebase/firestore/lite#(Transaction.set:1)}.
     *
     * The `WithFieldValue<T>` type extends `T` to also allow FieldValues such as
     * {@link (deleteField:1)} to be used as property values.
     */
    toFirestore(modelObject: WithFieldValue<AppModelType>): WithFieldValue<DbModelType>;
    /**
     * Called by the Firestore SDK to convert a custom model object of type
     * `AppModelType` into a plain JavaScript object (suitable for writing
     * directly to the Firestore database) of type `DbModelType`. Used with
     * {@link @firebase/firestore/lite#(setDoc:1)},
     * {@link @firebase/firestore/lite#(WriteBatch.set:1)} and
     * {@link @firebase/firestore/lite#(Transaction.set:1)} with `merge:true`
     * or `mergeFields`.
     *
     * The `PartialWithFieldValue<T>` type extends `Partial<T>` to allow
     * FieldValues such as {@link (arrayUnion:1)} to be used as property values.
     * It also supports nested `Partial` by allowing nested fields to be
     * omitted.
     */
    toFirestore(modelObject: PartialWithFieldValue<AppModelType>, options: SetOptions): PartialWithFieldValue<DbModelType>;
    /**
     * Called by the Firestore SDK to convert Firestore data into an object of
     * type `AppModelType`. You can access your data by calling:
     * `snapshot.data()`.
     *
     *
     * Generally, the data returned from `snapshot.data()` can be cast to
     * `DbModelType`; however, this is not guaranteed because Firestore does not
     * enforce a schema on the database. For example, writes from a previous
     * version of the application or writes from another client that did not use a
     * type converter could have written data with different properties and/or
     * property types. The implementation will need to choose whether to
     * gracefully recover from non-conforming data or throw an error.
     *
     * @param snapshot - A `QueryDocumentSnapshot` containing your data and
     * metadata.
     */
    fromFirestore(snapshot: QueryDocumentSnapshot_2<DocumentData, DocumentData>): AppModelType;
}

/** An error returned by a Firestore operation. */
declare class FirestoreError extends FirebaseError {
    /**
     * The backend error code associated with this error.
     */
    readonly code: FirestoreErrorCode;
    /**
     * A custom error description.
     */
    readonly message: string;
    /** The stack of the error. */
    readonly stack?: string;
    /** @hideconstructor */
    constructor(
    /**
     * The backend error code associated with this error.
     */
    code: FirestoreErrorCode, 
    /**
     * A custom error description.
     */
    message: string);
}

/**
 * The set of Firestore status codes. The codes are the same at the ones
 * exposed by gRPC here:
 * https://github.com/grpc/grpc/blob/master/doc/statuscodes.md
 *
 * Possible values:
 * - 'cancelled': The operation was cancelled (typically by the caller).
 * - 'unknown': Unknown error or an error from a different error domain.
 * - 'invalid-argument': Client specified an invalid argument. Note that this
 *   differs from 'failed-precondition'. 'invalid-argument' indicates
 *   arguments that are problematic regardless of the state of the system
 *   (e.g. an invalid field name).
 * - 'deadline-exceeded': Deadline expired before operation could complete.
 *   For operations that change the state of the system, this error may be
 *   returned even if the operation has completed successfully. For example,
 *   a successful response from a server could have been delayed long enough
 *   for the deadline to expire.
 * - 'not-found': Some requested document was not found.
 * - 'already-exists': Some document that we attempted to create already
 *   exists.
 * - 'permission-denied': The caller does not have permission to execute the
 *   specified operation.
 * - 'resource-exhausted': Some resource has been exhausted, perhaps a
 *   per-user quota, or perhaps the entire file system is out of space.
 * - 'failed-precondition': Operation was rejected because the system is not
 *   in a state required for the operation's execution.
 * - 'aborted': The operation was aborted, typically due to a concurrency
 *   issue like transaction aborts, etc.
 * - 'out-of-range': Operation was attempted past the valid range.
 * - 'unimplemented': Operation is not implemented or not supported/enabled.
 * - 'internal': Internal errors. Means some invariants expected by
 *   underlying system has been broken. If you see one of these errors,
 *   something is very broken.
 * - 'unavailable': The service is currently unavailable. This is most likely
 *   a transient condition and may be corrected by retrying with a backoff.
 * - 'data-loss': Unrecoverable data loss or corruption.
 * - 'unauthenticated': The request does not have valid authentication
 *   credentials for the operation.
 */
declare type FirestoreErrorCode = 'cancelled' | 'unknown' | 'invalid-argument' | 'deadline-exceeded' | 'not-found' | 'already-exists' | 'permission-denied' | 'resource-exhausted' | 'failed-precondition' | 'aborted' | 'out-of-range' | 'unimplemented' | 'internal' | 'unavailable' | 'data-loss' | 'unauthenticated';

/**
 * Union type from all supported SDK cache layer.
 */
declare type FirestoreLocalCache = MemoryLocalCache | PersistentLocalCache;

/**
 * An interface implemented by FirebaseFirestore that provides compatibility
 * with the usage in this file.
 *
 * This interface mainly exists to remove a cyclic dependency.
 */
declare interface FirestoreService extends _FirebaseService {
    _authCredentials: CredentialsProvider<User>;
    _appCheckCredentials: CredentialsProvider<string>;
    _persistenceKey: string;
    _databaseId: DatabaseId;
    _terminated: boolean;
    _freezeSettings(): FirestoreSettingsImpl;
}

/**
 * Specifies custom configurations for your Cloud Firestore instance.
 * You must set these before invoking any other methods.
 */
declare interface FirestoreSettings {
    /** The hostname to connect to. */
    host?: string;
    /** Whether to use SSL when connecting. */
    ssl?: boolean;
    /**
     * Whether to skip nested properties that are set to `undefined` during
     * object serialization. If set to `true`, these properties are skipped
     * and not written to Firestore. If set to `false` or omitted, the SDK
     * throws an exception when it encounters properties of type `undefined`.
     */
    ignoreUndefinedProperties?: boolean;
    /**
     * Only applicable in Node environments.
     *
     * The gRPC flow control window size in bytes. Defaults to 256 KB.
     * This maps directly to grpc-node's {@link https://github.com/grpc/grpc-node/blob/651cbeec6b4d6d11cbee91c042946d2fe5968ef6/packages/grpc-js/README.md#supported-channel-options | grpc-node.flow_control_window } setting.
     *
     * **WARNING:** This is an advanced setting. The default of 256 KB is optimized
     * for most Node workloads. Only modify this if you are actively tuning gRPC
     * network behavior and understand the implications of HTTP/2 flow control.
     */
    grpcFlowControlWindow?: number;
    /**
     * @internal
     * Undocumented setting for internal Google consumers.
     * External callers needing this feature, please let us
     * know by opening a feature request in the repository.
     */
    _customHeaders?: Record<string, string>;
}

/**
 * A concrete type describing all the values that can be applied via a
 * user-supplied `FirestoreSettings` object. This is a separate type so that
 * defaults can be supplied and the value can be checked for equality.
 */
declare class FirestoreSettingsImpl {
    /** The hostname to connect to. */
    readonly host: string;
    /** Whether to use SSL when connecting. */
    readonly ssl: boolean;
    readonly cacheSizeBytes: number;
    readonly experimentalForceLongPolling: boolean;
    readonly experimentalAutoDetectLongPolling: boolean;
    readonly experimentalLongPollingOptions: ExperimentalLongPollingOptions;
    readonly ignoreUndefinedProperties: boolean;
    readonly useFetchStreams: boolean;
    readonly localCache?: FirestoreLocalCache;
    readonly _customHeaders?: Record<string, string>;
    readonly isUsingEmulator: boolean;
    readonly grpcFlowControlWindow?: number;
    credentials?: any;
    constructor(settings: PrivateSettings);
    isEqual(other: FirestoreSettingsImpl): boolean;
}

declare namespace firestoreV1ApiClientInterfaces {
    interface Aggregation {
        count?: Count;
        sum?: Sum;
        avg?: Avg;
        alias?: string;
    }
    interface AggregationResult {
        aggregateFields?: ApiClientObjectMap<Value>;
    }
    interface ArrayValue {
        values?: Value[];
    }
    interface Avg {
        field?: FieldReference;
    }
    interface BatchGetDocumentsRequest {
        database?: string;
        documents?: string[];
        mask?: DocumentMask;
        transaction?: string;
        newTransaction?: TransactionOptions;
        readTime?: string;
    }
    interface BatchGetDocumentsResponse {
        found?: Document;
        missing?: string;
        transaction?: string;
        readTime?: string;
    }
    interface BeginTransactionRequest {
        options?: TransactionOptions;
    }
    interface BeginTransactionResponse {
        transaction?: string;
    }
    interface BitSequence {
        bitmap?: string | Uint8Array;
        padding?: number;
    }
    interface BloomFilter {
        bits?: BitSequence;
        hashCount?: number;
    }
    interface CollectionSelector {
        collectionId?: string;
        allDescendants?: boolean;
    }
    interface CommitRequest {
        database?: string;
        writes?: Write[];
        transaction?: string;
    }
    interface CommitResponse {
        writeResults?: WriteResult[];
        commitTime?: string;
    }
    interface CompositeFilter {
        op?: CompositeFilterOp;
        filters?: Filter[];
    }
    interface Count {
        upTo?: number;
    }
    interface Cursor {
        values?: Value[];
        before?: boolean;
    }
    interface Document {
        name?: string;
        fields?: ApiClientObjectMap<Value>;
        createTime?: Timestamp_2;
        updateTime?: Timestamp_2;
    }
    interface DocumentChange {
        document?: Document;
        targetIds?: number[];
        removedTargetIds?: number[];
    }
    interface DocumentDelete {
        document?: string;
        removedTargetIds?: number[];
        readTime?: Timestamp_2;
    }
    interface DocumentMask {
        fieldPaths?: string[];
    }
    interface DocumentRemove {
        document?: string;
        removedTargetIds?: number[];
        readTime?: string;
    }
    interface DocumentTransform {
        document?: string;
        fieldTransforms?: FieldTransform[];
    }
    interface DocumentsTarget {
        documents?: string[];
    }
    interface Empty {
    }
    interface ExecutePipelineRequest {
        database?: string;
        structuredPipeline?: StructuredPipeline;
        transaction?: string;
        newTransaction?: TransactionOptions;
        readTime?: string;
    }
    interface ExecutePipelineResponse {
        transaction?: string;
        results?: Document[];
        executionTime?: string;
    }
    interface ExistenceFilter {
        targetId?: number;
        count?: number;
        unchangedNames?: BloomFilter;
    }
    interface FieldFilter {
        field?: FieldReference;
        op?: FieldFilterOp;
        value?: Value;
    }
    interface FieldReference {
        fieldPath?: string;
    }
    interface FieldTransform {
        fieldPath?: string;
        setToServerValue?: FieldTransformSetToServerValue;
        appendMissingElements?: ArrayValue;
        removeAllFromArray?: ArrayValue;
        increment?: Value;
        minimum?: Value;
        maximum?: Value;
    }
    interface Filter {
        compositeFilter?: CompositeFilter;
        fieldFilter?: FieldFilter;
        unaryFilter?: UnaryFilter;
    }
    interface Function {
        name?: string;
        args?: Value[];
        options?: ApiClientObjectMap<Value>;
    }
    interface Index {
        name?: string;
        collectionId?: string;
        fields?: IndexField[];
        state?: IndexState_2;
    }
    interface IndexField {
        fieldPath?: string;
        mode?: IndexFieldMode;
    }
    interface LatLng {
        latitude?: number;
        longitude?: number;
    }
    interface ListCollectionIdsRequest {
        pageSize?: number;
        pageToken?: string;
    }
    interface ListCollectionIdsResponse {
        collectionIds?: string[];
        nextPageToken?: string;
    }
    interface ListDocumentsResponse {
        documents?: Document[];
        nextPageToken?: string;
    }
    interface ListIndexesResponse {
        indexes?: Index[];
        nextPageToken?: string;
    }
    interface ListenRequest {
        addTarget?: Target;
        removeTarget?: number;
        labels?: ApiClientObjectMap<string>;
    }
    interface ListenResponse {
        targetChange?: TargetChange;
        documentChange?: DocumentChange;
        documentDelete?: DocumentDelete;
        documentRemove?: DocumentRemove;
        filter?: ExistenceFilter;
    }
    interface MapValue {
        fields?: ApiClientObjectMap<Value>;
    }
    interface Operation {
        name?: string;
        metadata?: ApiClientObjectMap<any>;
        done?: boolean;
        error?: Status;
        response?: ApiClientObjectMap<any>;
    }
    interface Order {
        field?: FieldReference;
        direction?: OrderDirection;
    }
    interface Pipeline {
        stages?: Stage[];
    }
    interface Precondition {
        exists?: boolean;
        updateTime?: Timestamp_2;
    }
    interface Projection {
        fields?: FieldReference[];
    }
    interface QueryTarget {
        parent?: string;
        structuredQuery?: StructuredQuery;
    }
    interface PipelineQueryTarget {
        structuredPipeline?: StructuredPipeline;
    }
    interface ReadOnly {
        readTime?: string;
    }
    interface ReadWrite {
        retryTransaction?: string;
    }
    interface RollbackRequest {
        transaction?: string;
    }
    interface RunQueryRequest {
        parent?: string;
        structuredQuery?: StructuredQuery;
        transaction?: string;
        newTransaction?: TransactionOptions;
        readTime?: string;
    }
    interface RunQueryResponse {
        transaction?: string;
        document?: Document;
        readTime?: string;
        skippedResults?: number;
    }
    interface RunAggregationQueryRequest {
        parent?: string;
        structuredAggregationQuery?: StructuredAggregationQuery;
        transaction?: string;
        newTransaction?: TransactionOptions;
        readTime?: string;
    }
    interface RunAggregationQueryResponse {
        result?: AggregationResult;
        transaction?: string;
        readTime?: string;
    }
    interface StructuredAggregationQuery {
        structuredQuery?: StructuredQuery;
        aggregations?: Aggregation[];
    }
    interface Stage {
        name?: string;
        args?: Value[];
        options?: ApiClientObjectMap<Value>;
    }
    interface Status {
        code?: number;
        message?: string;
        details?: Array<ApiClientObjectMap<any>>;
    }
    interface StructuredPipeline {
        pipeline?: Pipeline;
        options?: ApiClientObjectMap<Value>;
    }
    interface StructuredQuery {
        select?: Projection;
        from?: CollectionSelector[];
        where?: Filter;
        orderBy?: Order[];
        startAt?: Cursor;
        endAt?: Cursor;
        offset?: number;
        limit?: number | {
            value: number;
        };
    }
    interface Sum {
        field?: FieldReference;
    }
    interface Target {
        query?: QueryTarget;
        documents?: DocumentsTarget;
        pipelineQuery?: PipelineQueryTarget;
        resumeToken?: string | Uint8Array;
        readTime?: Timestamp_2;
        targetId?: number;
        once?: boolean;
        expectedCount?: number | {
            value: number;
        };
    }
    interface TargetChange {
        targetChangeType?: TargetChangeTargetChangeType;
        targetIds?: number[];
        cause?: Status;
        resumeToken?: string | Uint8Array;
        readTime?: Timestamp_2;
    }
    interface TransactionOptions {
        readOnly?: ReadOnly;
        readWrite?: ReadWrite;
    }
    interface UnaryFilter {
        op?: UnaryFilterOp;
        field?: FieldReference;
    }
    interface Value {
        nullValue?: ValueNullValue;
        booleanValue?: boolean;
        integerValue?: string | number;
        doubleValue?: string | number;
        timestampValue?: Timestamp_2;
        stringValue?: string;
        bytesValue?: string | Uint8Array;
        referenceValue?: string;
        geoPointValue?: LatLng;
        arrayValue?: ArrayValue;
        mapValue?: MapValue;
        fieldReferenceValue?: string;
        variableReferenceValue?: string;
        functionValue?: Function;
        pipelineValue?: Pipeline;
    }
    interface Write {
        update?: Document;
        delete?: string;
        verify?: string;
        transform?: DocumentTransform;
        updateMask?: DocumentMask;
        updateTransforms?: FieldTransform[];
        currentDocument?: Precondition;
    }
    interface WriteRequest {
        streamId?: string;
        writes?: Write[];
        streamToken?: string | Uint8Array;
        labels?: ApiClientObjectMap<string>;
    }
    interface WriteResponse {
        streamId?: string;
        streamToken?: string | Uint8Array;
        writeResults?: WriteResult[];
        commitTime?: Timestamp_2;
    }
    interface WriteResult {
        updateTime?: Timestamp_2;
        transformResults?: Value[];
    }
}

/**
 * Creates an aggregation that finds the first value of an expression across multiple stage
 * inputs.
 *
 * @example
 * ```typescript
 * // Find the first value of the 'rating' field
 * first(field("rating")).as("firstRating");
 * ```
 *
 * @param expression - The expression to find the first value of.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'first' aggregation.
 */
export declare function first(expression: Expression): AggregateFunction;

/**
 * Creates an aggregation that finds the first value of a field across multiple stage inputs.
 *
 * @example
 * ```typescript
 * // Find the first value of the 'rating' field
 * first("rating").as("firstRating");
 * ```
 *
 * @param fieldName - The name of the field to find the first value of.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'first' aggregation.
 */
export declare function first(fieldName: string): AggregateFunction;

/**
 * @internal
 */
declare interface FirstPartyCredentialsSettings {
    ['type']: 'firstParty';
    ['sessionIndex']: string;
    ['iamToken']: string | null;
    ['authTokenFactory']: AuthTokenFactory | null;
}

/**
 * Creates an expression that computes the floor of a numeric value.
 *
 * @param expr - The expression to compute the floor of.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the floor of the numeric value.
 */
export declare function floor(expr: Expression): FunctionExpression;

/**
 * Creates an expression that computes the floor of a numeric value.
 *
 * @param fieldName - The name of the field to compute the floor of.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the floor of the numeric value.
 */
export declare function floor(fieldName: string): FunctionExpression;

/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
declare type FulfilledHandler<T, R> = ((result: T) => R | PersistencePromise<R>) | null;

/**
 *
 * This class defines the base class for Firestore {@link @firebase/firestore/pipelines#Pipeline} functions, which can be evaluated within pipeline
 * execution.
 *
 * Typically, you would not use this class or its children directly. Use either the functions like {@link @firebase/firestore/pipelines#and}, {@link @firebase/firestore/pipelines#(equal:1)},
 * or the methods on {@link @firebase/firestore/pipelines#Expression} ({@link @firebase/firestore/pipelines#Expression.(equal:1)}, {@link @firebase/firestore/pipelines#Expression.(lessThan:1)}, etc.) to construct new Function instances.
 */
export declare class FunctionExpression extends Expression {
    readonly name: string;
    readonly params: Expression[];
    readonly expressionType: ExpressionType;
    constructor(name: string, params: Expression[]);
    /**
     * @hideconstructor
     */
    constructor(name: string, params: Expression[], _methodName?: string, options?: {});
    /**
     * @private
     * @internal
     */
    _methodName: string | undefined;
    /**
     * @private
     * @internal
     */
    private _options;
    /**
     * @private
     * @internal
     */
    get _optionsUtil(): OptionsUtil;
    /**
     * @private
     * @internal
     */
    _optionsProto: ApiClientObjectMap<firestoreV1ApiClientInterfaces.Value> | undefined;
    /**
     * @private
     * @internal
     */
    _toProto(serializer: JsonProtoSerializer): Value;
    /**
     * @private
     * @internal
     */
    _readUserData(context: ParseContext): void;
}

/**
 * @beta
 * Evaluates to the distance in meters between the location in the specified
 * field and the query location.
 *
 * @remarks This Expression can only be used within a `search` stage.
 *
 * @example
 * ```typescript
 * db.pipeline().collection('restaurants').search({
 *   query: 'waffles',
 *   sort: geoDistance('location', new GeoPoint(37.0, -122.0)).ascending()
 * })
 * ```
 *
 * @param fieldName - Specifies the field in the document which contains
 * the first GeoPoint for distance computation.
 * @param location - Compute distance to this GeoPoint.
 */
export declare function geoDistance(fieldName: string | Field, location: GeoPoint | Expression): Expression;

/**
 * An immutable object representing a geographic location in Firestore. The
 * location is represented as latitude/longitude pair.
 *
 * Latitude values are in the range of [-90, 90].
 * Longitude values are in the range of [-180, 180].
 */
export declare class GeoPoint {
    private _lat;
    private _long;
    /**
     * Creates a new immutable `GeoPoint` object with the provided latitude and
     * longitude values.
     * @param latitude - The latitude as number between -90 and 90.
     * @param longitude - The longitude as number between -180 and 180.
     */
    constructor(latitude: number, longitude: number);
    /**
     * The latitude of this `GeoPoint` instance.
     */
    get latitude(): number;
    /**
     * The longitude of this `GeoPoint` instance.
     */
    get longitude(): number;
    /**
     * Returns true if this `GeoPoint` is equal to the provided one.
     *
     * @param other - The `GeoPoint` to compare against.
     * @returns true if this `GeoPoint` is equal to the provided one.
     */
    isEqual(other: GeoPoint): boolean;
    /**
     * Actually private to JS consumers of our API, so this function is prefixed
     * with an underscore.
     */
    _compareTo(other: GeoPoint): number;
    static _jsonSchemaVersion: string;
    static _jsonSchema: {
        type: Property<"string">;
        latitude: Property<"number">;
        longitude: Property<"number">;
    };
    /**
     * Returns a JSON-serializable representation of this `GeoPoint` instance.
     *
     * @returns a JSON representation of this object.
     */
    toJSON(): {
        latitude: number;
        longitude: number;
        type: string;
    };
    /**
     * Builds a `GeoPoint` instance from a JSON object created by {@link GeoPoint.toJSON}.
     *
     * @param json - a JSON object represention of a `GeoPoint` instance
     * @returns an instance of {@link GeoPoint} if the JSON object could be parsed. Throws a
     * {@link FirestoreError} if an error occurs.
     */
    static fromJSON(json: object): GeoPoint;
}

/**
 * General purpose cache for global values.
 *
 * Global state that cuts across components should be saved here. Following are contained herein:
 *
 * `sessionToken` tracks server interaction across Listen and Write streams. This facilitates cache
 * synchronization and invalidation.
 */
declare interface GlobalsCache {
    /**
     * Gets session token.
     */
    getSessionToken(transaction: PersistenceTransaction): PersistencePromise<ByteString>;
    /**
     * Sets session token.
     *
     * @param sessionToken - The new session token.
     */
    setSessionToken(transaction: PersistenceTransaction, sessionToken: ByteString): PersistencePromise<void>;
}

/**
 *
 * Creates an expression that checks if the first expression is greater than the second
 * expression.
 *
 * @example
 * ```typescript
 * // Check if the 'age' field is greater than 18
 * greaterThan(field("age"), constant(9).add(9));
 * ```
 *
 * @param left - The first expression to compare.
 * @param right - The second expression to compare.
 * @returns A new `Expression` representing the greater than comparison.
 */
export declare function greaterThan(left: Expression, right: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if an expression is greater than a constant value.
 *
 * @example
 * ```typescript
 * // Check if the 'age' field is greater than 18
 * greaterThan(field("age"), 18);
 * ```
 *
 * @param expression - The expression to compare.
 * @param value - The constant value to compare to.
 * @returns A new `Expression` representing the greater than comparison.
 */
export declare function greaterThan(expression: Expression, value: unknown): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is greater than an expression.
 *
 * @example
 * ```typescript
 * // Check if the value of field 'age' is greater than the value of field 'limit'
 * greaterThan("age", field("limit"));
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param expression - The expression to compare to.
 * @returns A new `Expression` representing the greater than comparison.
 */
export declare function greaterThan(fieldName: string, expression: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is greater than a constant value.
 *
 * @example
 * ```typescript
 * // Check if the 'price' field is greater than 100
 * greaterThan("price", 100);
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param value - The constant value to compare to.
 * @returns A new `Expression` representing the greater than comparison.
 */
export declare function greaterThan(fieldName: string, value: unknown): BooleanExpression;

/**
 *
 * Creates an expression that checks if the first expression is greater than or equal to the
 * second expression.
 *
 * @example
 * ```typescript
 * // Check if the 'quantity' field is greater than or equal to the field "threshold"
 * greaterThanOrEqual(field("quantity"), field("threshold"));
 * ```
 *
 * @param left - The first expression to compare.
 * @param right - The second expression to compare.
 * @returns A new `Expression` representing the greater than or equal to comparison.
 */
export declare function greaterThanOrEqual(left: Expression, right: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if an expression is greater than or equal to a constant
 * value.
 *
 * @example
 * ```typescript
 * // Check if the 'quantity' field is greater than or equal to 10
 * greaterThanOrEqual(field("quantity"), 10);
 * ```
 *
 * @param expression - The expression to compare.
 * @param value - The constant value to compare to.
 * @returns A new `Expression` representing the greater than or equal to comparison.
 */
export declare function greaterThanOrEqual(expression: Expression, value: unknown): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is greater than or equal to an expression.
 *
 * @example
 * ```typescript
 * // Check if the value of field 'age' is greater than or equal to the value of field 'limit'
 * greaterThanOrEqual("age", field("limit"));
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param value - The expression to compare to.
 * @returns A new `Expression` representing the greater than or equal to comparison.
 */
export declare function greaterThanOrEqual(fieldName: string, value: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is greater than or equal to a constant
 * value.
 *
 * @example
 * ```typescript
 * // Check if the 'score' field is greater than or equal to 80
 * greaterThanOrEqual("score", 80);
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param value - The constant value to compare to.
 * @returns A new `Expression` representing the greater than or equal to comparison.
 */
export declare function greaterThanOrEqual(fieldName: string, value: unknown): BooleanExpression;

/**
 * Creates an expression that returns the `elseExpr` argument if `ifExpr` is absent, else return
 * the result of the `ifExpr` argument evaluation.
 *
 * @example
 * ```typescript
 * // Returns the value of the optional field 'optional_field', or returns 'default_value'
 * // if the field is absent.
 * ifAbsent(field("optional_field"), constant("default_value"))
 * ```
 *
 * @param ifExpr - The expression to check for absence.
 * @param elseExpr - The expression that will be evaluated and returned if [ifExpr] is absent.
 * @returns A new Expression representing the ifAbsent operation.
 */
export declare function ifAbsent(ifExpr: Expression, elseExpr: Expression): Expression;

/**
 * Creates an expression that returns the `elseValue` argument if `ifExpr` is absent, else
 * return the result of the `ifExpr` argument evaluation.
 *
 * @example
 * ```typescript
 * // Returns the value of the optional field 'optional_field', or returns 'default_value'
 * // if the field is absent.
 * ifAbsent(field("optional_field"), "default_value")
 * ```
 *
 * @param ifExpr - The expression to check for absence.
 * @param elseValue - The value that will be returned if `ifExpr` evaluates to an absent value.
 * @returns A new [Expression] representing the ifAbsent operation.
 */
export declare function ifAbsent(ifExpr: Expression, elseValue: unknown): Expression;

/**
 * Creates an expression that returns the `elseExpr` argument if `ifFieldName` is absent, else
 * return the value of the field.
 *
 * @example
 * ```typescript
 * // Returns the value of the optional field 'optional_field', or returns the value of
 * // 'default_field' if 'optional_field' is absent.
 * ifAbsent("optional_field", field("default_field"))
 * ```
 *
 * @param ifFieldName - The field to check for absence.
 * @param elseExpr - The expression that will be evaluated and returned if `ifFieldName` is
 * absent.
 * @returns A new Expression representing the ifAbsent operation.
 */
export declare function ifAbsent(ifFieldName: string, elseExpr: Expression): Expression;

/**
 * Creates an expression that returns the `elseValue` argument if `ifFieldName` is absent, else
 * return the value of the field.
 *
 * @example
 * ```typescript
 * // Returns the value of the optional field 'optional_field', or returns 'default_value'
 * // if the field is absent.
 * ifAbsent("optional_field", "default_value")
 * ```
 *
 * @param ifFieldName - The field to check for absence.
 * @param elseValue - The value that will be returned if [ifFieldName] is absent.
 * @returns A new Expression representing the ifAbsent operation.
 */
export declare function ifAbsent(ifFieldName: string | Expression, elseValue: Expression | unknown): Expression;

/**
 *
 * Creates an expression that returns the `catch` argument if there is an
 * error, else return the result of the `try` argument evaluation.
 *
 * This overload is useful when a BooleanExpression is required.
 *
 * @example
 * ```typescript
 * // Create an expression that protects against a divide by zero error
 * // but always returns a boolean expression.
 * ifError(constant(50).divide(field('length')).greaterThan(1), constant(false));
 * ```
 *
 * @param tryExpr - The try expression.
 * @param catchExpr - The catch expression that will be evaluated and
 * returned if the tryExpr produces an error.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ifError' operation.
 */
export declare function ifError(tryExpr: BooleanExpression, catchExpr: BooleanExpression): BooleanExpression;

/**
 *
 * Creates an expression that returns the `catch` argument if there is an
 * error, else return the result of the `try` argument evaluation.
 *
 * @example
 * ```typescript
 * // Returns the first item in the title field arrays, or returns
 * // the entire title field if the array is empty or the field is another type.
 * ifError(field("title").arrayGet(0), field("title"));
 * ```
 *
 * @param tryExpr - The try expression.
 * @param catchExpr - The catch expression that will be evaluated and
 * returned if the tryExpr produces an error.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ifError' operation.
 */
export declare function ifError(tryExpr: Expression, catchExpr: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the `catch` argument if there is an
 * error, else return the result of the `try` argument evaluation.
 *
 * @example
 * ```typescript
 * // Returns the first item in the title field arrays, or returns
 * // "Default Title"
 * ifError(field("title").arrayGet(0), "Default Title");
 * ```
 *
 * @param tryExpr - The try expression.
 * @param catchValue - The value that will be returned if the tryExpr produces an
 * error.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'ifError' operation.
 */
export declare function ifError(tryExpr: Expression, catchValue: unknown): FunctionExpression;

/**
 * Creates an expression that returns the `elseExpr` argument if `ifExpr` is null, else
 * return the result of the `ifExpr` argument evaluation.
 *
 * @remarks
 * This function provides a fallback for both absent and explicit null values. In contrast,
 * `ifAbsent()` only triggers for missing fields.
 *
 * @example
 * ```typescript
 * // Returns the user's preferred name, or if that is null, returns their full name.
 * ifNull(field("preferredName"), field("fullName"))
 * ```
 *
 * @param ifExpr - The expression to check for null.
 * @param elseExpr - The expression that will be evaluated and returned if `ifExpr` is null.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the ifNull operation.
 */
export declare function ifNull(ifExpr: Expression, elseExpr: Expression): FunctionExpression;

/**
 * Creates an expression that returns the `elseValue` argument if `ifExpr` is null, else
 * return the result of the `ifExpr` argument evaluation.
 *
 * @remarks
 * This function provides a fallback for both absent and explicit null values. In contrast,
 * `ifAbsent()` only triggers for missing fields.
 *
 * @example
 * ```typescript
 * // Returns the user's display name, or returns "Anonymous" if the field is null.
 * ifNull(field("displayName"), "Anonymous")
 * ```
 *
 * @param ifExpr - The expression to check for null.
 * @param elseValue - The value that will be returned if `ifExpr` evaluates to null.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the ifNull operation.
 */
export declare function ifNull(ifExpr: Expression, elseValue: unknown): FunctionExpression;

/**
 * Creates an expression that returns the `elseExpr` argument if `ifFieldName` field is null, else
 * return the value of the field.
 *
 * @remarks
 * This function provides a fallback for both absent and explicit null values. In contrast,
 * `ifAbsent()` only triggers for missing fields.
 *
 * @example
 * ```typescript
 * // Returns the user's preferred name, or if that is null, returns their full name.
 * ifNull("preferredName", field("fullName"))
 * ```
 *
 * @param ifFieldName - The field to check for null.
 * @param elseExpr - The expression that will be evaluated and returned if `ifFieldName` is null.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the ifNull operation.
 */
export declare function ifNull(ifFieldName: string, elseExpr: Expression): FunctionExpression;

/**
 * Creates an expression that returns the `elseValue` argument if `ifFieldName` field is null, else
 * return the value of the field.
 *
 * @remarks
 * This function provides a fallback for both absent and explicit null values. In contrast,
 * `ifAbsent()` only triggers for missing fields.
 *
 * @example
 * ```typescript
 * // Returns the user's display name, or returns "Anonymous" if the field is null.
 * ifNull("displayName", "Anonymous")
 * ```
 *
 * @param ifFieldName - The field to check for null.
 * @param elseValue - The value that will be returned if `ifFieldName` is null.
 * @returns A new {@link @firebase/firestore/pipelines#Expression}  representing the ifNull operation.
 */
export declare function ifNull(ifFieldName: string, elseValue: unknown): FunctionExpression;

declare type IndexFieldMode = 'MODE_UNSPECIFIED' | 'ASCENDING' | 'DESCENDING';

/** The type of the index, e.g. for which type of query it can be used. */
declare const enum IndexKind {
    /**
     * Ordered index. Can be used for <, <=, ==, >=, >, !=, IN and NOT IN queries.
     */
    ASCENDING = 0,
    /**
     * Ordered index. Can be used for <, <=, ==, >=, >, !=, IN and NOT IN queries.
     */
    DESCENDING = 1,
    /** Contains index. Can be used for ArrayContains and ArrayContainsAny. */
    CONTAINS = 2
}

/**
 * Represents a set of indexes that are used to execute queries efficiently.
 *
 * Currently the only index is a [collection id] =&gt; [parent path] index, used
 * to execute Collection Group queries.
 */
declare interface IndexManager {
    /**
     * Creates an index entry mapping the collectionId (last segment of the path)
     * to the parent path (either the containing document location or the empty
     * path for root-level collections). Index entries can be retrieved via
     * getCollectionParents().
     *
     * NOTE: Currently we don't remove index entries. If this ends up being an
     * issue we can devise some sort of GC strategy.
     */
    addToCollectionParentIndex(transaction: PersistenceTransaction, collectionPath: ResourcePath): PersistencePromise<void>;
    /**
     * Retrieves all parent locations containing the given collectionId, as a
     * list of paths (each path being either a document location or the empty
     * path for a root-level collection).
     */
    getCollectionParents(transaction: PersistenceTransaction, collectionId: string): PersistencePromise<ResourcePath[]>;
    /**
     * Adds a field path index.
     *
     * Values for this index are persisted via the index backfill, which runs
     * asynchronously in the background. Once the first values are written,
     * an index can be used to serve partial results for any matching queries.
     * Any unindexed portion of the database will continue to be served via
     * collection scons.
     */
    addFieldIndex(transaction: PersistenceTransaction, index: FieldIndex): PersistencePromise<void>;
    /** Removes the given field index and deletes all index values. */
    deleteFieldIndex(transaction: PersistenceTransaction, index: FieldIndex): PersistencePromise<void>;
    /** Removes all field indexes and deletes all index values. */
    deleteAllFieldIndexes(transaction: PersistenceTransaction): PersistencePromise<void>;
    /** Creates a full matched field index which serves the given target. */
    createTargetIndexes(transaction: PersistenceTransaction, target: Target): PersistencePromise<void>;
    /**
     * Returns a list of field indexes that correspond to the specified collection
     * group.
     *
     * @param collectionGroup - The collection group to get matching field indexes
     * for.
     * @returns A collection of field indexes for the specified collection group.
     */
    getFieldIndexes(transaction: PersistenceTransaction, collectionGroup: string): PersistencePromise<FieldIndex[]>;
    /** Returns all configured field indexes. */
    getFieldIndexes(transaction: PersistenceTransaction): PersistencePromise<FieldIndex[]>;
    /**
     * Returns the type of index (if any) that can be used to serve the given
     * target.
     */
    getIndexType(transaction: PersistenceTransaction, target: Target): PersistencePromise<IndexType>;
    /**
     * Returns the documents that match the given target based on the provided
     * index or `null` if the target does not have a matching index.
     */
    getDocumentsMatchingTarget(transaction: PersistenceTransaction, target: Target): PersistencePromise<DocumentKey[] | null>;
    /**
     * Returns the next collection group to update. Returns `null` if no group
     * exists.
     */
    getNextCollectionGroupToUpdate(transaction: PersistenceTransaction): PersistencePromise<string | null>;
    /**
     * Sets the collection group's latest read time.
     *
     * This method updates the index offset for all field indices for the
     * collection group and increments their sequence number. Subsequent calls to
     * `getNextCollectionGroupToUpdate()` will return a different collection group
     * (unless only one collection group is configured).
     */
    updateCollectionGroup(transaction: PersistenceTransaction, collectionGroup: string, offset: IndexOffset): PersistencePromise<void>;
    /** Updates the index entries for the provided documents. */
    updateIndexEntries(transaction: PersistenceTransaction, documents: DocumentMap): PersistencePromise<void>;
    /**
     * Iterates over all field indexes that are used to serve the given target,
     * and returns the minimum offset of them all.
     */
    getMinOffset(transaction: PersistenceTransaction, target: Target): PersistencePromise<IndexOffset>;
    /** Returns the minimum offset for the given collection group. */
    getMinOffsetFromCollectionGroup(transaction: PersistenceTransaction, collectionGroup: string): PersistencePromise<IndexOffset>;
}

/**
 * Stores the latest read time, document and batch ID that were processed for an
 * index.
 */
declare class IndexOffset {
    /**
     * The latest read time version that has been indexed by Firestore for this
     * field index.
     */
    readonly readTime: SnapshotVersion;
    /**
     * The key of the last document that was indexed for this query. Use
     * `DocumentKey.empty()` if no document has been indexed.
     */
    readonly documentKey: DocumentKey;
    readonly largestBatchId: number;
    constructor(
    /**
     * The latest read time version that has been indexed by Firestore for this
     * field index.
     */
    readTime: SnapshotVersion, 
    /**
     * The key of the last document that was indexed for this query. Use
     * `DocumentKey.empty()` if no document has been indexed.
     */
    documentKey: DocumentKey, largestBatchId: number);
    /** Returns an offset that sorts before all regular offsets. */
    static min(): IndexOffset;
    /** Returns an offset that sorts after all regular offsets. */
    static max(): IndexOffset;
}

/** An index component consisting of field path and index type.  */
declare class IndexSegment {
    /** The field path of the component. */
    readonly fieldPath: FieldPath_2;
    /** The fields sorting order. */
    readonly kind: IndexKind;
    constructor(
    /** The field path of the component. */
    fieldPath: FieldPath_2, 
    /** The fields sorting order. */
    kind: IndexKind);
}

/**
 * Stores the "high water mark" that indicates how updated the Index is for the
 * current user.
 */
declare class IndexState {
    /**
     * Indicates when the index was last updated (relative to other indexes).
     */
    readonly sequenceNumber: number;
    /** The the latest indexed read time, document and batch id. */
    readonly offset: IndexOffset;
    constructor(
    /**
     * Indicates when the index was last updated (relative to other indexes).
     */
    sequenceNumber: number, 
    /** The the latest indexed read time, document and batch id. */
    offset: IndexOffset);
    /** The state of an index that has not yet been backfilled. */
    static empty(): IndexState;
}

declare type IndexState_2 = 'STATE_UNSPECIFIED' | 'CREATING' | 'READY' | 'ERROR';

/** Represents the index state as it relates to a particular target. */
declare const enum IndexType {
    /** Indicates that no index could be found for serving the target. */
    NONE = 0,
    /**
     * Indicates that only a "partial index" could be found for serving the
     * target. A partial index is one which does not have a segment for every
     * filter/orderBy in the target.
     */
    PARTIAL = 1,
    /**
     * Indicates that a "full index" could be found for serving the target. A full
     * index is one which has a segment for every filter/orderBy in the target.
     */
    FULL = 2
}

/**
 * @internal
 * @private
 *
 * This function is for internal use only.
 *
 * Returns the `ExecutePipelineRequest` representation of the given query.
 * Returns `null` if the Firestore client associated with the given query has
 * not been initialized or has been terminated.
 *
 * @param pipeline - The Pipeline to convert to proto representation.
 */
export declare function _internalPipelineToExecutePipelineRequestProto(pipeline: Pipeline_2): any;

/**
 *
 * Creates an expression that returns `true` if a value is absent. Otherwise,
 * returns `false` even if the value is `null`.
 *
 * @example
 * ```typescript
 * // Check if the field `value` is absent.
 * isAbsent(field("value"));
 * ```
 *
 * @param value - The expression to check.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'isAbsent' check.
 */
export declare function isAbsent(value: Expression): BooleanExpression;

/**
 *
 * Creates an expression that returns `true` if a field is absent. Otherwise,
 * returns `false` even if the field value is `null`.
 *
 * @example
 * ```typescript
 * // Check if the field `value` is absent.
 * isAbsent("value");
 * ```
 *
 * @param field - The field to check.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'isAbsent' check.
 */
export declare function isAbsent(field: string): BooleanExpression;

/**
 *
 * Creates an expression that checks if a given expression produces an error.
 *
 * @example
 * ```typescript
 * // Check if the result of a calculation is an error
 * isError(field("title").arrayContains(1));
 * ```
 *
 * @param value - The expression to check.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'isError' check.
 */
export declare function isError(value: Expression): BooleanExpression;

/**
 * Creates an expression that checks if the value in the specified field is of the given type.
 *
 * @remarks Null or undefined fields evaluate to skip/error. Use `ifAbsent()` / `isAbsent()` to evaluate missing data.
 * Supported values for `type` are:
 * `'null'`, `'array'`, `'boolean'`, `'bytes'`, `'timestamp'`, `'geo_point'`, `'number'`,
 * `'int32'`, `'int64'`, `'float64'`, `'decimal128'`, `'map'`, `'reference'`, `'string'`,
 * `'vector'`, `'max_key'`, `'min_key'`, `'object_id'`, `'regex'`, `'request_timestamp'`.
 *
 * @example
 * ```typescript
 * // Check if the 'price' field is a floating point number (evaluating to true inside pipeline conditionals)
 * isType('price', 'float64');
 * ```
 *
 * @param fieldName - The name of the field to check.
 * @param type - The type to check for.
 * @returns A new `BooleanExpression` that evaluates to true if the field's value is of the given type, false otherwise.
 */
export declare function isType(fieldName: string, type: string): BooleanExpression;

/**
 * Creates an expression that checks if the result of an expression is of the given type.
 *
 * @remarks Null or undefined fields evaluate to skip/error. Use `ifAbsent()` / `isAbsent()` to evaluate missing data.
 * Supported values for `type` are:
 * `'null'`, `'array'`, `'boolean'`, `'bytes'`, `'timestamp'`, `'geo_point'`, `'number'`,
 * `'int32'`, `'int64'`, `'float64'`, `'decimal128'`, `'map'`, `'reference'`, `'string'`,
 * `'vector'`, `'max_key'`, `'min_key'`, `'object_id'`, `'regex'`, `'request_timestamp'`.
 *
 * @example
 * ```typescript
 * // Check if the result of a calculation is a number
 * isType(add('count', 1), 'number')
 * ```
 *
 * @param expression - The expression to check.
 * @param type - The type to check for.
 * @returns A new `BooleanExpression` that evaluates to true if the expression's result is of the given type, false otherwise.
 */
export declare function isType(expression: Expression, type: string): BooleanExpression;

/**
 * Creates an expression that joins the elements of an array into a string.
 *
 * @example
 * ```typescript
 * // Join the elements of the 'tags' field with a comma and space.
 * join("tags", ", ")
 * ```
 *
 * @param arrayFieldName - The name of the field containing the array.
 * @param delimiter - The string to use as a delimiter.
 * @returns A new Expression representing the join operation.
 */
export declare function join(arrayFieldName: string, delimiter: string): Expression;

/**
 * Creates an expression that joins the elements of an array into a string.
 *
 * @example
 * ```typescript
 * // Join an array of string using the delimiter from the 'separator' field.
 * join(array(['foo', 'bar']), field("separator"))
 * ```
 *
 * @param arrayExpression - An expression that evaluates to an array.
 * @param delimiterExpression - The expression that evaluates to the delimiter string.
 * @returns A new Expression representing the join operation.
 */
export declare function join(arrayExpression: Expression, delimiterExpression: Expression): Expression;

/**
 * Creates an expression that joins the elements of an array into a string.
 *
 * @example
 * ```typescript
 * // Join the elements of the 'tags' field with a comma and space.
 * join(field("tags"), ", ")
 * ```
 *
 * @param arrayExpression - An expression that evaluates to an array.
 * @param delimiter - The string to use as a delimiter.
 * @returns A new Expression representing the join operation.
 */
export declare function join(arrayExpression: Expression, delimiter: string): Expression;

/**
 * Creates an expression that joins the elements of an array into a string.
 *
 * @example
 * ```typescript
 * // Join the elements of the 'tags' field with the delimiter from the 'separator' field.
 * join('tags', field("separator"))
 * ```
 *
 * @param arrayFieldName - The name of the field containing the array.
 * @param delimiterExpression - The expression that evaluates to the delimiter string.
 * @returns A new Expression representing the join operation.
 */
export declare function join(arrayFieldName: string, delimiterExpression: Expression): Expression;

/**
 * This class generates JsonObject values for the Datastore API suitable for
 * sending to either GRPC stub methods or via the JSON/HTTP REST API.
 *
 * The serializer supports both Protobuf.js and Proto3 JSON formats. By
 * setting `useProto3Json` to true, the serializer will use the Proto3 JSON
 * format.
 *
 * For a description of the Proto3 JSON format check
 * https://developers.google.com/protocol-buffers/docs/proto3#json
 *
 * TODO(klimt): We can remove the databaseId argument if we keep the full
 * resource name in documents.
 */
declare class JsonProtoSerializer implements Serializer {
    readonly databaseId: DatabaseId;
    readonly useProto3Json: boolean;
    constructor(databaseId: DatabaseId, useProto3Json: boolean);
}

/**
 * @license
 * Copyright 2025 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * A list of data types Firestore objects may serialize in their toJSON implemenetations.
 * @private
 * @internal
 */
declare type JsonTypeDesc = 'object' | 'string' | 'number' | 'boolean' | 'null' | 'undefined';

declare type Kind = 'memory' | 'persistent';

/**
 * Creates an aggregation that finds the last value of an expression across multiple stage
 * inputs.
 *
 * @example
 * ```typescript
 * // Find the last value of the 'rating' field
 * last(field("rating")).as("lastRating");
 * ```
 *
 * @param expression - The expression to find the last value of.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'last' aggregation.
 */
export declare function last(expression: Expression): AggregateFunction;

/**
 * Creates an aggregation that finds the last value of a field across multiple stage inputs.
 *
 * @example
 * ```typescript
 * // Find the last value of the 'rating' field
 * last("rating").as("lastRating");
 * ```
 *
 * @param fieldName - The name of the field to find the last value of.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'last' aggregation.
 */
export declare function last(fieldName: string): AggregateFunction;

/**
 * Creates an expression that calculates the length of a string, array, map, vector, or bytes.
 *
 * @example
 * ```typescript
 * // Get the length of the 'name' field.
 * length("name");
 *
 * // Get the number of items in the 'cart' array.
 * length("cart");
 * ```
 *
 * @param fieldName - The name of the field to calculate the length of.
 * @returns A new `Expression` representing the length of the string, array, map, vector, or bytes.
 */
declare function length_2(fieldName: string): FunctionExpression;

/**
 * Creates an expression that calculates the length of a string, array, map, vector, or bytes.
 *
 * @example
 * ```typescript
 * // Get the length of the 'name' field.
 * length(field("name"));
 *
 * // Get the number of items in the 'cart' array.
 * length(field("cart"));
 * ```
 *
 * @param expression - An expression evaluating to a string, array, map, vector, or bytes, which the length will be calculated for.
 * @returns A new `Expression` representing the length of the string, array, map, vector, or bytes.
 */
declare function length_2(expression: Expression): FunctionExpression;
export { length_2 as length }

/**
 *
 * Creates an expression that checks if the first expression is less than the second expression.
 *
 * @example
 * ```typescript
 * // Check if the 'age' field is less than 30
 * lessThan(field("age"), field("limit"));
 * ```
 *
 * @param left - The first expression to compare.
 * @param right - The second expression to compare.
 * @returns A new `Expression` representing the less than comparison.
 */
export declare function lessThan(left: Expression, right: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if an expression is less than a constant value.
 *
 * @example
 * ```typescript
 * // Check if the 'age' field is less than 30
 * lessThan(field("age"), 30);
 * ```
 *
 * @param expression - The expression to compare.
 * @param value - The constant value to compare to.
 * @returns A new `Expression` representing the less than comparison.
 */
export declare function lessThan(expression: Expression, value: unknown): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is less than an expression.
 *
 * @example
 * ```typescript
 * // Check if the 'age' field is less than the 'limit' field
 * lessThan("age", field("limit"));
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param expression - The expression to compare to.
 * @returns A new `Expression` representing the less than comparison.
 */
export declare function lessThan(fieldName: string, expression: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is less than a constant value.
 *
 * @example
 * ```typescript
 * // Check if the 'price' field is less than 50
 * lessThan("price", 50);
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param value - The constant value to compare to.
 * @returns A new `Expression` representing the less than comparison.
 */
export declare function lessThan(fieldName: string, value: unknown): BooleanExpression;

/**
 *
 * Creates an expression that checks if the first expression is less than or equal to the second
 * expression.
 *
 * @example
 * ```typescript
 * // Check if the 'quantity' field is less than or equal to 20
 * lessThan(field("quantity"), field("limit"));
 * ```
 *
 * @param left - The first expression to compare.
 * @param right - The second expression to compare.
 * @returns A new `Expression` representing the less than or equal to comparison.
 */
export declare function lessThanOrEqual(left: Expression, right: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if an expression is less than or equal to a constant value.
 *
 * @example
 * ```typescript
 * // Check if the 'quantity' field is less than or equal to 20
 * lessThan(field("quantity"), 20);
 * ```
 *
 * @param expression - The expression to compare.
 * @param value - The constant value to compare to.
 * @returns A new `Expression` representing the less than or equal to comparison.
 */
export declare function lessThanOrEqual(expression: Expression, value: unknown): BooleanExpression;

/**
 * Creates an expression that checks if a field's value is less than or equal to an expression.
 *
 * @example
 * ```typescript
 * // Check if the 'quantity' field is less than or equal to the 'limit' field
 * lessThan("quantity", field("limit"));
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param expression - The expression to compare to.
 * @returns A new `Expression` representing the less than or equal to comparison.
 */
export declare function lessThanOrEqual(fieldName: string, expression: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is less than or equal to a constant value.
 *
 * @example
 * ```typescript
 * // Check if the 'score' field is less than or equal to 70
 * lessThan("score", 70);
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param value - The constant value to compare to.
 * @returns A new `Expression` representing the less than or equal to comparison.
 */
export declare function lessThanOrEqual(fieldName: string, value: unknown): BooleanExpression;

/**
 *
 * Creates an expression that performs a case-sensitive wildcard string comparison against a
 * field.
 *
 * @example
 * ```typescript
 * // Check if the 'title' field contains the string "guide"
 * like("title", "%guide%");
 * ```
 *
 * @param fieldName - The name of the field containing the string.
 * @param pattern - The pattern to search for. You can use "%" as a wildcard character.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'like' comparison.
 */
export declare function like(fieldName: string, pattern: string): BooleanExpression;

/**
 *
 * Creates an expression that performs a case-sensitive wildcard string comparison against a
 * field.
 *
 * @example
 * ```typescript
 * // Check if the 'title' field contains the string "guide"
 * like("title", field("pattern"));
 * ```
 *
 * @param fieldName - The name of the field containing the string.
 * @param pattern - The pattern to search for. You can use "%" as a wildcard character.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'like' comparison.
 */
export declare function like(fieldName: string, pattern: Expression): BooleanExpression;

/**
 *
 * Creates an expression that performs a case-sensitive wildcard string comparison.
 *
 * @example
 * ```typescript
 * // Check if the 'title' field contains the string "guide"
 * like(field("title"), "%guide%");
 * ```
 *
 * @param stringExpression - The expression representing the string to perform the comparison on.
 * @param pattern - The pattern to search for. You can use "%" as a wildcard character.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'like' comparison.
 */
export declare function like(stringExpression: Expression, pattern: string): BooleanExpression;

/**
 *
 * Creates an expression that performs a case-sensitive wildcard string comparison.
 *
 * @example
 * ```typescript
 * // Check if the 'title' field contains the string "guide"
 * like(field("title"), field("pattern"));
 * ```
 *
 * @param stringExpression - The expression representing the string to perform the comparison on.
 * @param pattern - The pattern to search for. You can use "%" as a wildcard character.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'like' comparison.
 */
export declare function like(stringExpression: Expression, pattern: Expression): BooleanExpression;

/**
 * Options defining how a LimitStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(limit:1)}.
 */
export declare type LimitStageOptions = StageOptions & {
    /**
     * The maximum number of documents to return.
     */
    limit: number;
};

declare const enum LimitType {
    First = "F",
    Last = "L"
}

/** LimitType enum. */
declare type LimitType_2 = 'FIRST' | 'LAST';

declare enum ListenerDataSource {
    /** Listen to both cache and server changes */
    Default = "default",
    /** Listen to changes in cache only */
    Cache = "cache"
}

declare interface ListenOptions {
    /** Raise events even when only the metadata changes */
    readonly includeMetadataChanges?: boolean;
    /**
     * Wait for a sync with the server when online, but still raise events while
     * offline.
     */
    readonly waitForSyncWhenOnline?: boolean;
    /** Set the source events raised from. */
    readonly source?: ListenerDataSource;
    /** Realtime Pipeline Only: Set server timestamp behavior. */
    readonly serverTimestampBehavior?: 'estimate' | 'previous' | 'none';
}

declare type ListenSequenceNumber = number;

/**
 * Describe the source a query listens to.
 *
 * Set to `default` to listen to both cache and server changes. Set to `cache`
 * to listen to changes in cache only.
 */
export declare type ListenSource = 'default' | 'cache';

declare class LLRBEmptyNode<K, V> {
    get key(): never;
    get value(): never;
    get color(): never;
    get left(): never;
    get right(): never;
    size: number;
    copy(key: K | null, value: V | null, color: boolean | null, left: LLRBNode<K, V> | LLRBEmptyNode<K, V> | null, right: LLRBNode<K, V> | LLRBEmptyNode<K, V> | null): LLRBEmptyNode<K, V>;
    insert(key: K, value: V, comparator: Comparator<K>): LLRBNode<K, V>;
    remove(key: K, comparator: Comparator<K>): LLRBEmptyNode<K, V>;
    isEmpty(): boolean;
    inorderTraversal(action: (k: K, v: V) => boolean): boolean;
    reverseTraversal(action: (k: K, v: V) => boolean): boolean;
    minKey(): K | null;
    maxKey(): K | null;
    isRed(): boolean;
    checkMaxDepth(): boolean;
    protected check(): 0;
}

declare class LLRBNode<K, V> {
    key: K;
    value: V;
    readonly color: boolean;
    readonly left: LLRBNode<K, V> | LLRBEmptyNode<K, V>;
    readonly right: LLRBNode<K, V> | LLRBEmptyNode<K, V>;
    readonly size: number;
    static EMPTY: LLRBEmptyNode<any, any>;
    static RED: boolean;
    static BLACK: boolean;
    constructor(key: K, value: V, color?: boolean, left?: LLRBNode<K, V> | LLRBEmptyNode<K, V>, right?: LLRBNode<K, V> | LLRBEmptyNode<K, V>);
    copy(key: K | null, value: V | null, color: boolean | null, left: LLRBNode<K, V> | LLRBEmptyNode<K, V> | null, right: LLRBNode<K, V> | LLRBEmptyNode<K, V> | null): LLRBNode<K, V>;
    isEmpty(): boolean;
    inorderTraversal<T>(action: (k: K, v: V) => T): T;
    reverseTraversal<T>(action: (k: K, v: V) => T): T;
    private min;
    minKey(): K | null;
    maxKey(): K | null;
    insert(key: K, value: V, comparator: Comparator<K>): LLRBNode<K, V>;
    private removeMin;
    remove(key: K, comparator: Comparator<K>): LLRBNode<K, V> | LLRBEmptyNode<K, V>;
    isRed(): boolean;
    private fixUp;
    private moveRedLeft;
    private moveRedRight;
    private rotateLeft;
    private rotateRight;
    private colorFlip;
    checkMaxDepth(): boolean;
    protected check(): number;
}

/**
 * Creates an expression that computes the natural logarithm of a numeric value.
 *
 * @example
 * ```typescript
 * // Compute the natural logarithm of the 'value' field.
 * ln("value");
 * ```
 *
 * @param fieldName - The name of the field to compute the natural logarithm of.
 * @returns A new `Expression` representing the natural logarithm of the numeric value.
 */
export declare function ln(fieldName: string): FunctionExpression;

/**
 * Creates an expression that computes the natural logarithm of a numeric value.
 *
 * @example
 * ```typescript
 * // Compute the natural logarithm of the 'value' field.
 * ln(field("value"));
 * ```
 *
 * @param expression - An expression evaluating to a numeric value, which the natural logarithm will be computed for.
 * @returns A new `Expression` representing the natural logarithm of the numeric value.
 */
export declare function ln(expression: Expression): FunctionExpression;

/**
 * A readonly view of the local state of all documents we're tracking (i.e. we
 * have a cached version in remoteDocumentCache or local mutations for the
 * document). The view is computed by applying the mutations in the
 * MutationQueue to the RemoteDocumentCache.
 */
declare class LocalDocumentsView {
    readonly remoteDocumentCache: RemoteDocumentCache;
    readonly mutationQueue: MutationQueue;
    readonly documentOverlayCache: DocumentOverlayCache;
    readonly indexManager: IndexManager;
    constructor(remoteDocumentCache: RemoteDocumentCache, mutationQueue: MutationQueue, documentOverlayCache: DocumentOverlayCache, indexManager: IndexManager);
    /**
     * Get the local view of the document identified by `key`.
     *
     * @returns Local view of the document or null if we don't have any cached
     * state for it.
     */
    getDocument(transaction: PersistenceTransaction, key: DocumentKey): PersistencePromise<Document_2>;
    /**
     * Gets the local view of the documents identified by `keys`.
     *
     * If we don't have cached state for a document in `keys`, a NoDocument will
     * be stored for that key in the resulting set.
     */
    getDocuments(transaction: PersistenceTransaction, keys: DocumentKeySet): PersistencePromise<DocumentMap>;
    /**
     * Similar to `getDocuments`, but creates the local view from the given
     * `baseDocs` without retrieving documents from the local store.
     *
     * @param transaction - The transaction this operation is scoped to.
     * @param docs - The documents to apply local mutations to get the local views.
     * @param existenceStateChanged - The set of document keys whose existence state
     *   is changed. This is useful to determine if some documents overlay needs
     *   to be recalculated.
     */
    getLocalViewOfDocuments(transaction: PersistenceTransaction, docs: MutableDocumentMap, existenceStateChanged?: DocumentKeySet): PersistencePromise<DocumentMap>;
    /**
     * Gets the overlayed documents for the given document map, which will include
     * the local view of those documents and a `FieldMask` indicating which fields
     * are mutated locally, `null` if overlay is a Set or Delete mutation.
     */
    getOverlayedDocuments(transaction: PersistenceTransaction, docs: MutableDocumentMap): PersistencePromise<OverlayedDocumentMap>;
    /**
     * Fetches the overlays for {@code docs} and adds them to provided overlay map
     * if the map does not already contain an entry for the given document key.
     */
    private populateOverlays;
    /**
     * Computes the local view for the given documents.
     *
     * @param docs - The documents to compute views for. It also has the base
     *   version of the documents.
     * @param overlays - The overlays that need to be applied to the given base
     *   version of the documents.
     * @param existenceStateChanged - A set of documents whose existence states
     *   might have changed. This is used to determine if we need to re-calculate
     *   overlays from mutation queues.
     * @returns A map represents the local documents view.
     */
    computeViews(transaction: PersistenceTransaction, docs: MutableDocumentMap, overlays: OverlayMap, existenceStateChanged: DocumentKeySet): PersistencePromise<OverlayedDocumentMap>;
    private recalculateAndSaveOverlays;
    /**
     * Recalculates overlays by reading the documents from remote document cache
     * first, and saves them after they are calculated.
     */
    recalculateAndSaveOverlaysForDocumentKeys(transaction: PersistenceTransaction, documentKeys: DocumentKeySet): PersistencePromise<DocumentKeyMap<FieldMask | null>>;
    /**
     * Performs a query against the local view of all documents.
     *
     * @param transaction - The persistence transaction.
     * @param query - The query to match documents against.
     * @param offset - Read time and key to start scanning by (exclusive).
     * @param context - A optional tracker to keep a record of important details
     *   during database local query execution.
     */
    getDocumentsMatchingQuery(transaction: PersistenceTransaction, query: QueryOrPipeline, offset: IndexOffset, context?: QueryContext): PersistencePromise<DocumentMap>;
    /**
     * Given a collection group, returns the next documents that follow the provided offset, along
     * with an updated batch ID.
     *
     * <p>The documents returned by this method are ordered by remote version from the provided
     * offset. If there are no more remote documents after the provided offset, documents with
     * mutations in order of batch id from the offset are returned. Since all documents in a batch are
     * returned together, the total number of documents returned can exceed {@code count}.
     *
     * @param transaction
     * @param collectionGroup - The collection group for the documents.
     * @param offset - The offset to index into.
     * @param count - The number of documents to return
     * @returns A LocalWriteResult with the documents that follow the provided offset and the last processed batch id.
     */
    getNextDocuments(transaction: PersistenceTransaction, collectionGroup: string, offset: IndexOffset, count: number): PersistencePromise<LocalWriteResult>;
    private getDocumentsMatchingDocumentQuery;
    private getDocumentsMatchingCollectionGroupQuery;
    private getDocumentsMatchingCollectionQuery;
    private getDocumentsMatchingPipeline;
    private retrieveMatchingLocalDocuments;
    private getOverlaysForPipeline;
}

declare interface LocalStore {
    collectGarbage(garbageCollector: LruGarbageCollector): Promise<LruResults>;
    /** Manages the list of active field and collection indices. */
    indexManager: IndexManager;
    /**
     * The "local" view of all documents (layering mutationQueue on top of
     * remoteDocumentCache).
     */
    localDocuments: LocalDocumentsView;
}

/** The result of a write to the local store. */
declare interface LocalWriteResult {
    batchId: BatchId;
    changes: DocumentMap;
}

/**
 * Creates an expression that computes the logarithm of an expression to a given base.
 *
 * @example
 * ```typescript
 * // Compute the logarithm of the 'value' field with base 10.
 * log(field("value"), 10);
 * ```
 *
 * @param expression - An expression evaluating to a numeric value, which the logarithm will be computed for.
 * @param base - The base of the logarithm.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logarithm of the numeric value.
 */
export declare function log(expression: Expression, base: number): FunctionExpression;

/**
 * Creates an expression that computes the logarithm of an expression to a given base.
 *
 * @example
 * ```typescript
 * // Compute the logarithm of the 'value' field with the base in the 'base' field.
 * log(field("value"), field("base"));
 * ```
 *
 * @param expression - An expression evaluating to a numeric value, which the logarithm will be computed for.
 * @param base - The base of the logarithm.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logarithm of the numeric value.
 */
export declare function log(expression: Expression, base: Expression): FunctionExpression;

/**
 * Creates an expression that computes the logarithm of a field to a given base.
 *
 * @example
 * ```typescript
 * // Compute the logarithm of the 'value' field with base 10.
 * log("value", 10);
 * ```
 *
 * @param fieldName - The name of the field to compute the logarithm of.
 * @param base - The base of the logarithm.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logarithm of the numeric value.
 */
export declare function log(fieldName: string, base: number): FunctionExpression;

/**
 * Creates an expression that computes the logarithm of a field to a given base.
 *
 * @example
 * ```typescript
 * // Compute the logarithm of the 'value' field with the base in the 'base' field.
 * log("value", field("base"));
 * ```
 *
 * @param fieldName - The name of the field to compute the logarithm of.
 * @param base - The base of the logarithm.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logarithm of the numeric value.
 */
export declare function log(fieldName: string, base: Expression): FunctionExpression;

/**
 * Creates an expression that computes the base-10 logarithm of a numeric value.
 *
 * @example
 * ```typescript
 * // Compute the base-10 logarithm of the 'value' field.
 * log10("value");
 * ```
 *
 * @param fieldName - The name of the field to compute the base-10 logarithm of.
 * @returns A new `Expression` representing the base-10 logarithm of the numeric value.
 */
export declare function log10(fieldName: string): FunctionExpression;

/**
 * Creates an expression that computes the base-10 logarithm of a numeric value.
 *
 * @example
 * ```typescript
 * // Compute the base-10 logarithm of the 'value' field.
 * log10(field("value"));
 * ```
 *
 * @param expression - An expression evaluating to a numeric value, which the base-10 logarithm will be computed for.
 * @returns A new `Expression` representing the base-10 logarithm of the numeric value.
 */
export declare function log10(expression: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the largest value between multiple input
 * expressions or literal values. Based on Firestore's value type ordering.
 *
 * @example
 * ```typescript
 * // Returns the largest value between the 'field1' field, the 'field2' field,
 * // and 1000
 * logicalMaximum(field("field1"), field("field2"), 1000);
 * ```
 *
 * @param first - The first operand expression.
 * @param second - The second expression or literal.
 * @param others - Optional additional expressions or literals.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logical maximum operation.
 */
export declare function logicalMaximum(first: Expression, second: Expression | unknown, ...others: Array<Expression | unknown>): FunctionExpression;

/**
 *
 * Creates an expression that returns the largest value between multiple input
 * expressions or literal values. Based on Firestore's value type ordering.
 *
 * @example
 * ```typescript
 * // Returns the largest value between the 'field1' field, the 'field2' field,
 * // and 1000.
 * logicalMaximum("field1", field("field2"), 1000);
 * ```
 *
 * @param fieldName - The first operand field name.
 * @param second - The second expression or literal.
 * @param others - Optional additional expressions or literals.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logical maximum operation.
 */
export declare function logicalMaximum(fieldName: string, second: Expression | unknown, ...others: Array<Expression | unknown>): FunctionExpression;

/**
 *
 * Creates an expression that returns the smallest value between multiple input
 * expressions and literal values. Based on Firestore's value type ordering.
 *
 * @example
 * ```typescript
 * // Returns the smallest value between the 'field1' field, the 'field2' field,
 * // and 1000.
 * logicalMinimum(field("field1"), field("field2"), 1000);
 * ```
 *
 * @param first - The first operand expression.
 * @param second - The second expression or literal.
 * @param others - Optional additional expressions or literals.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logical minimum operation.
 */
export declare function logicalMinimum(first: Expression, second: Expression | unknown, ...others: Array<Expression | unknown>): FunctionExpression;

/**
 *
 * Creates an expression that returns the smallest value between a field's value
 * and other input expressions or literal values.
 * Based on Firestore's value type ordering.
 *
 * @example
 * ```typescript
 * // Returns the smallest value between the 'field1' field, the 'field2' field,
 * // and 1000.
 * logicalMinimum("field1", field("field2"), 1000);
 * ```
 *
 * @param fieldName - The first operand field name.
 * @param second - The second expression or literal.
 * @param others - Optional additional expressions or literals.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logical minimum operation.
 */
export declare function logicalMinimum(fieldName: string, second: Expression | unknown, ...others: Array<Expression | unknown>): FunctionExpression;

declare interface LruGarbageCollector {
    readonly params: LruParams;
    collect(txn: PersistenceTransaction, activeTargetIds: ActiveTargets): PersistencePromise<LruResults>;
    /** Given a percentile of target to collect, returns the number of targets to collect. */
    calculateTargetCount(txn: PersistenceTransaction, percentile: number): PersistencePromise<number>;
    /** Returns the nth sequence number, counting in order from the smallest. */
    nthSequenceNumber(txn: PersistenceTransaction, n: number): PersistencePromise<number>;
    /**
     * Removes documents that have a sequence number equal to or less than the
     * upper bound and are not otherwise pinned.
     */
    removeOrphanedDocuments(txn: PersistenceTransaction, upperBound: ListenSequenceNumber): PersistencePromise<number>;
    getCacheSize(txn: PersistenceTransaction): PersistencePromise<number>;
    /**
     * Removes targets with a sequence number equal to or less than the given
     * upper bound, and removes document associations with those targets.
     */
    removeTargets(txn: PersistenceTransaction, upperBound: ListenSequenceNumber, activeTargetIds: ActiveTargets): PersistencePromise<number>;
}

declare class LruParams {
    readonly cacheSizeCollectionThreshold: number;
    readonly percentileToCollect: number;
    readonly maximumSequenceNumbersToCollect: number;
    private static readonly DEFAULT_COLLECTION_PERCENTILE;
    private static readonly DEFAULT_MAX_SEQUENCE_NUMBERS_TO_COLLECT;
    static withCacheSize(cacheSize: number): LruParams;
    static readonly DEFAULT: LruParams;
    static readonly DISABLED: LruParams;
    constructor(cacheSizeCollectionThreshold: number, percentileToCollect: number, maximumSequenceNumbersToCollect: number);
}

/**
 * Describes the results of a garbage collection run. `didRun` will be set to
 * `false` if collection was skipped (either it is disabled or the cache size
 * has not hit the threshold). If collection ran, the other fields will be
 * filled in with the details of the results.
 */
declare interface LruResults {
    readonly didRun: boolean;
    readonly sequenceNumbersCollected: number;
    readonly targetsRemoved: number;
    readonly documentsRemoved: number;
}

/**
 * Trims whitespace or a specified set of characters/bytes from the beginning of a string or byte array.
 *
 * @example
 * ```typescript
 * // Trim whitespace from the beginning of the 'userInput' field
 * ltrim(field("userInput"));
 *
 * // Trim quotes from the beginning of the 'userInput' field
 * ltrim(field("userInput"), '"');
 * ```
 *
 * @param fieldName - The name of the field containing the string or byte array.
 * @param valueToTrim - Optional. A string or byte array containing the characters/bytes to trim.
 * If not specified, whitespace will be trimmed.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the trimmed string or byte array.
 */
export declare function ltrim(fieldName: string, valueToTrim?: string | Expression | Bytes): FunctionExpression;

/**
 * Trims whitespace or a specified set of characters/bytes from the beginning of a string or byte array.
 *
 * @example
 * ```typescript
 * // Trim whitespace from the beginning of the 'userInput' field
 * ltrim(field("userInput"));
 *
 * // Trim quotes from the beginning of the 'userInput' field
 * ltrim(field("userInput"), '"');
 * ```
 *
 * @param expression - The expression representing the string or byte array.
 * @param valueToTrim - Optional. A string or byte array containing the characters/bytes to trim.
 * If not specified, whitespace will be trimmed.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the trimmed string or byte array.
 */
export declare function ltrim(expression: Expression, valueToTrim?: string | Expression | Bytes): FunctionExpression;

/**
 *
 * Creates an expression that creates a Firestore map value from an input object.
 *
 * @example
 * ```typescript
 * // Create a map from the input object and reference the 'baz' field value from the input document.
 * map({foo: 'bar', baz: field('baz')}).as('data');
 * ```
 *
 * @param elements - The input map to evaluate in the expression.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the map function.
 */
export declare function map(elements: Record<string, unknown>): FunctionExpression;

/**
 * Creates an expression that returns the entries of a map as an array of maps,
 * where each map contains a `"k"` property for the key and a `"v"` property for the value.
 * For example: `[{ k: "key1", v: "value1" }, ...]`.
 *
 * @remarks
 * While the backend generally preserves insertion order, relying on the
 * order of the output array is not guaranteed and should be avoided.
 *
 * @example
 * ```typescript
 * // Get the entries of the 'address' map field
 * mapEntries("address");
 * ```
 *
 * @param mapField - The map field to get the entries of.
 * @returns A new `Expression` representing the entries of the map.
 */
export declare function mapEntries(mapField: string): FunctionExpression;

/**
 * Creates an expression that returns the entries of a map as an array of maps,
 * where each map contains a `"k"` property for the key and a `"v"` property for the value.
 * For example: `[{ k: "key1", v: "value1" }, ...]`.
 *
 * @remarks
 * While the backend generally preserves insertion order, relying on the
 * order of the output array is not guaranteed and should be avoided.
 *
 * @example
 * ```typescript
 * // Get the entries of the map expression
 * mapEntries(map({"city": "San Francisco"}));
 * ```
 *
 * @param mapExpression - The expression representing the map to get the entries of.
 * @returns A new `Expression` representing the entries of the map.
 */
export declare function mapEntries(mapExpression: Expression): FunctionExpression;

/**
 *
 * Accesses a value from a map (object) field using the provided key.
 *
 * @example
 * ```typescript
 * // Get the 'city' value from the 'address' map field
 * mapGet("address", "city");
 * ```
 *
 * @param fieldName - The field name of the map field.
 * @param subField - The key to access in the map.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the value associated with the given key in the map.
 */
export declare function mapGet(fieldName: string, subField: string): FunctionExpression;

/**
 *
 * Accesses a value from a map (object) expression using the provided key.
 *
 * @example
 * ```typescript
 * // Get the 'city' value from the 'address' map field
 * mapGet(field("address"), "city");
 * ```
 *
 * @param mapExpression - The expression representing the map.
 * @param subField - The key to access in the map.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the value associated with the given key in the map.
 */
export declare function mapGet(mapExpression: Expression, subField: string): FunctionExpression;

/**
 * Creates an expression that returns the keys of a map.
 *
 * @remarks
 * While the backend generally preserves insertion order, relying on the
 * order of the output array is not guaranteed and should be avoided.
 *
 * @example
 * ```typescript
 * // Get the keys of the 'address' map field
 * mapKeys("address");
 * ```
 *
 * @param mapField - The map field to get the keys of.
 * @returns A new `Expression` representing the keys of the map.
 */
export declare function mapKeys(mapField: string): FunctionExpression;

/**
 * Creates an expression that returns the keys of a map.
 *
 * @remarks
 * While the backend generally preserves insertion order, relying on the
 * order of the output array is not guaranteed and should be avoided.
 *
 * @example
 * ```typescript
 * // Get the keys of the map expression
 * mapKeys(map({"city": "San Francisco"}));
 * ```
 *
 * @param mapExpression - The expression representing the map to get the keys of.
 * @returns A new `Expression` representing the keys of the map.
 */
export declare function mapKeys(mapExpression: Expression): FunctionExpression;

/**
 *
 * Creates an expression that merges multiple map values.
 *
 * @example
 * ```typescript
 * // Merges the map in the settings field with, a map literal, and a map in
 * // that is conditionally returned by another expression
 * mapMerge('settings', { enabled: true }, conditional(field('isAdmin'), { admin: true}, {})
 * ```
 *
 * @param mapField - Name of a field containing a map value that will be merged.
 * @param secondMap - A required second map to merge. Represented as a literal or
 * an expression that returns a map.
 * @param otherMaps - Optional additional maps to merge. Each map is represented
 * as a literal or an expression that returns a map.
 */
export declare function mapMerge(mapField: string, secondMap: Record<string, unknown> | Expression, ...otherMaps: Array<Record<string, unknown> | Expression>): FunctionExpression;

/**
 *
 * Creates an expression that merges multiple map values.
 *
 * @example
 * ```typescript
 * // Merges the map in the settings field with, a map literal, and a map in
 * // that is conditionally returned by another expression
 * mapMerge(field('settings'), { enabled: true }, conditional(field('isAdmin'), { admin: true}, {})
 * ```
 *
 * @param firstMap - An expression or literal map value that will be merged.
 * @param secondMap - A required second map to merge. Represented as a literal or
 * an expression that returns a map.
 * @param otherMaps - Optional additional maps to merge. Each map is represented
 * as a literal or an expression that returns a map.
 */
export declare function mapMerge(firstMap: Record<string, unknown> | Expression, secondMap: Record<string, unknown> | Expression, ...otherMaps: Array<Record<string, unknown> | Expression>): FunctionExpression;

/**
 *
 * Creates an expression that removes a key from the map at the specified field name.
 *
 * @example
 * ```typescript
 * // Removes the key 'city' field from the map in the address field of the input document.
 * mapRemove('address', 'city');
 * ```
 *
 * @param mapField - The name of a field containing a map value.
 * @param key - The name of the key to remove from the input map.
 */
export declare function mapRemove(mapField: string, key: string): FunctionExpression;

/**
 *
 * Creates an expression that removes a key from the map produced by evaluating an expression.
 *
 * @example
 * ```typescript
 * // Removes the key 'baz' from the input map.
 * mapRemove(map({foo: 'bar', baz: true}), 'baz');
 * ```
 *
 * @param mapExpr - An expression return a map value.
 * @param key - The name of the key to remove from the input map.
 */
export declare function mapRemove(mapExpr: Expression, key: string): FunctionExpression;

/**
 *
 * Creates an expression that removes a key from the map at the specified field name.
 *
 * @example
 * ```typescript
 * // Removes the key 'city' field from the map in the address field of the input document.
 * mapRemove('address', constant('city'));
 * ```
 *
 * @param mapField - The name of a field containing a map value.
 * @param keyExpr - An expression that produces the name of the key to remove from the input map.
 */
export declare function mapRemove(mapField: string, keyExpr: Expression): FunctionExpression;

/**
 *
 * Creates an expression that removes a key from the map produced by evaluating an expression.
 *
 * @example
 * ```typescript
 * // Removes the key 'baz' from the input map.
 * mapRemove(map({foo: 'bar', baz: true}), constant('baz'));
 * ```
 *
 * @param mapExpr - An expression return a map value.
 * @param keyExpr - An expression that produces the name of the key to remove from the input map.
 */
export declare function mapRemove(mapExpr: Expression, keyExpr: Expression): FunctionExpression;

/**
 * Creates an expression that returns a new map with the specified entries added or updated.
 *
 * @remarks
 * This only performs shallow updates to the map. Setting a value to `null`
 * will retain the key with a `null` value. To remove a key entirely, use `mapRemove`.
 *
 * @example
 * ```typescript
 * // Set the 'city' to 'San Francisco' in the 'address' map field
 * mapSet("address", "city", "San Francisco");
 * ```
 *
 * @param mapField - The map field to set entries in.
 * @param key - The key to set. Must be a string or a constant string expression.
 * @param value - The value to set.
 * @param moreKeyValues - Additional key-value pairs to set.
 * @returns A new `Expression` representing the map with the entries set.
 */
export declare function mapSet(mapField: string, key: string | Expression, value: unknown, ...moreKeyValues: unknown[]): FunctionExpression;

/**
 * Creates an expression that returns a new map with the specified entries added or updated.
 *
 * @remarks
 * This only performs shallow updates to the map. Setting a value to `null`
 * will retain the key with a `null` value. To remove a key entirely, use `mapRemove`.
 *
 * @example
 * ```typescript
 * // Set the 'city' to "San Francisco"
 * mapSet(map({"state": "California"}), "city", "San Francisco");
 * ```
 *
 * @param mapExpression - The expression representing the map.
 * @param key - The key to set. Must be a string or a constant string expression.
 * @param value - The value to set.
 * @param moreKeyValues - Additional key-value pairs to set.
 * @returns A new `Expression` representing the map with the entries set.
 */
export declare function mapSet(mapExpression: Expression, key: string | Expression, value: unknown, ...moreKeyValues: unknown[]): FunctionExpression;

declare type MapValue = firestoreV1ApiClientInterfaces.MapValue;

/**
 * Creates an expression that returns the values of a map.
 *
 * @remarks
 * While the backend generally preserves insertion order, relying on the
 * order of the output array is not guaranteed and should be avoided.
 *
 * @example
 * ```typescript
 * // Get the values of the 'address' map field
 * mapValues("address");
 * ```
 *
 * @param mapField - The map field to get the values of.
 * @returns A new `Expression` representing the values of the map.
 */
export declare function mapValues(mapField: string): FunctionExpression;

/**
 * Creates an expression that returns the values of a map.
 *
 * @remarks
 * While the backend generally preserves insertion order, relying on the
 * order of the output array is not guaranteed and should be avoided.
 *
 * @example
 * ```typescript
 * // Get the values of the map expression
 * mapValues(map({"city": "San Francisco"}));
 * ```
 *
 * @param mapExpression - The expression representing the map to get the values of.
 * @returns A new `Expression` representing the values of the map.
 */
export declare function mapValues(mapExpression: Expression): FunctionExpression;

/**
 *
 * Creates an aggregation that finds the maximum value of an expression across multiple stage
 * inputs.
 *
 * @example
 * ```typescript
 * // Find the highest score in a leaderboard
 * maximum(field("score")).as("highestScore");
 * ```
 *
 * @param expression - The expression to find the maximum value of.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'maximum' aggregation.
 */
export declare function maximum(expression: Expression): AggregateFunction;

/**
 *
 * Creates an aggregation that finds the maximum value of a field across multiple stage inputs.
 *
 * @example
 * ```typescript
 * // Find the highest score in a leaderboard
 * maximum("score").as("highestScore");
 * ```
 *
 * @param fieldName - The name of the field to find the maximum value of.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'maximum' aggregation.
 */
export declare function maximum(fieldName: string): AggregateFunction;

/**
 * Provides an in-memory cache to the SDK. This is the default cache unless explicitly
 * configured otherwise.
 *
 * To use, create an instance using the factory function {@link memoryLocalCache()}, then
 * set the instance to `FirestoreSettings.cache` and call `initializeFirestore` using
 * the settings object.
 */
declare interface MemoryLocalCache {
    kind: 'memory';
    /**
     * @internal
     */
    _onlineComponentProvider: OnlineComponentProviderFactory;
    /**
     * @internal
     */
    _offlineComponentProvider: OfflineComponentProviderFactory;
}

/**
 *
 * Creates an aggregation that finds the minimum value of an expression across multiple stage
 * inputs.
 *
 * @example
 * ```typescript
 * // Find the lowest price of all products
 * minimum(field("price")).as("lowestPrice");
 * ```
 *
 * @param expression - The expression to find the minimum value of.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'minimum' aggregation.
 */
export declare function minimum(expression: Expression): AggregateFunction;

/**
 *
 * Creates an aggregation that finds the minimum value of a field across multiple stage inputs.
 *
 * @example
 * ```typescript
 * // Find the lowest price of all products
 * minimum("price").as("lowestPrice");
 * ```
 *
 * @param fieldName - The name of the field to find the minimum value of.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'minimum' aggregation.
 */
export declare function minimum(fieldName: string): AggregateFunction;

/**
 *
 * Creates an expression that calculates the modulo (remainder) of dividing two expressions.
 *
 * @example
 * ```typescript
 * // Calculate the remainder of dividing 'field1' by 'field2'.
 * mod(field("field1"), field("field2"));
 * ```
 *
 * @param left - The dividend expression.
 * @param right - The divisor expression.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the modulo operation.
 */
export declare function mod(left: Expression, right: Expression): FunctionExpression;

/**
 *
 * Creates an expression that calculates the modulo (remainder) of dividing an expression by a constant.
 *
 * @example
 * ```typescript
 * // Calculate the remainder of dividing 'field1' by 5.
 * mod(field("field1"), 5);
 * ```
 *
 * @param expression - The dividend expression.
 * @param value - The divisor constant.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the modulo operation.
 */
export declare function mod(expression: Expression, value: unknown): FunctionExpression;

/**
 *
 * Creates an expression that calculates the modulo (remainder) of dividing a field's value by an expression.
 *
 * @example
 * ```typescript
 * // Calculate the remainder of dividing 'field1' by 'field2'.
 * mod("field1", field("field2"));
 * ```
 *
 * @param fieldName - The dividend field name.
 * @param expression - The divisor expression.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the modulo operation.
 */
export declare function mod(fieldName: string, expression: Expression): FunctionExpression;

/**
 *
 * Creates an expression that calculates the modulo (remainder) of dividing a field's value by a constant.
 *
 * @example
 * ```typescript
 * // Calculate the remainder of dividing 'field1' by 5.
 * mod("field1", 5);
 * ```
 *
 * @param fieldName - The dividend field name.
 * @param value - The divisor constant.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the modulo operation.
 */
export declare function mod(fieldName: string, value: unknown): FunctionExpression;

/**
 *
 * Creates an expression that multiplies two expressions together.
 *
 * @example
 * ```typescript
 * // Multiply the 'quantity' field by the 'price' field
 * multiply(field("quantity"), field("price"));
 * ```
 *
 * @param first - The first expression to multiply.
 * @param second - The second expression or literal to multiply.
 * @param others - Optional additional expressions or literals to multiply.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the multiplication operation.
 */
export declare function multiply(first: Expression, second: Expression | unknown): FunctionExpression;

/**
 *
 * Creates an expression that multiplies a field's value by an expression.
 *
 * @example
 * ```typescript
 * // Multiply the 'quantity' field by the 'price' field
 * multiply("quantity", field("price"));
 * ```
 *
 * @param fieldName - The name of the field containing the value to add.
 * @param second - The second expression or literal to add.
 * @param others - Optional other expressions or literals to add.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the multiplication operation.
 */
export declare function multiply(fieldName: string, second: Expression | unknown): FunctionExpression;

/**
 * Represents a document in Firestore with a key, version, data and whether it
 * has local mutations applied to it.
 *
 * Documents can transition between states via `convertToFoundDocument()`,
 * `convertToNoDocument()` and `convertToUnknownDocument()`. If a document does
 * not transition to one of these states even after all mutations have been
 * applied, `isValidDocument()` returns false and the document should be removed
 * from all views.
 */
declare class MutableDocument implements Document_2 {
    readonly key: DocumentKey;
    private documentType;
    version: SnapshotVersion;
    readTime: SnapshotVersion;
    createTime: SnapshotVersion;
    data: ObjectValue;
    private documentState;
    private constructor();
    /**
     * Creates a document with no known version or data, but which can serve as
     * base document for mutations.
     */
    static newInvalidDocument(documentKey: DocumentKey): MutableDocument;
    /**
     * Creates a new document that is known to exist with the given data at the
     * given version.
     */
    static newFoundDocument(documentKey: DocumentKey, version: SnapshotVersion, createTime: SnapshotVersion, value: ObjectValue): MutableDocument;
    /** Creates a new document that is known to not exist at the given version. */
    static newNoDocument(documentKey: DocumentKey, version: SnapshotVersion): MutableDocument;
    /**
     * Creates a new document that is known to exist at the given version but
     * whose data is not known (e.g. a document that was updated without a known
     * base document).
     */
    static newUnknownDocument(documentKey: DocumentKey, version: SnapshotVersion): MutableDocument;
    /**
     * Changes the document type to indicate that it exists and that its version
     * and data are known.
     */
    convertToFoundDocument(version: SnapshotVersion, value: ObjectValue): MutableDocument;
    /**
     * Changes the document type to indicate that it doesn't exist at the given
     * version.
     */
    convertToNoDocument(version: SnapshotVersion): MutableDocument;
    /**
     * Changes the document type to indicate that it exists at a given version but
     * that its data is not known (e.g. a document that was updated without a known
     * base document).
     */
    convertToUnknownDocument(version: SnapshotVersion): MutableDocument;
    setHasCommittedMutations(): MutableDocument;
    setHasLocalMutations(): MutableDocument;
    setReadTime(readTime: SnapshotVersion): MutableDocument;
    get hasLocalMutations(): boolean;
    get hasCommittedMutations(): boolean;
    get hasPendingWrites(): boolean;
    isValidDocument(): boolean;
    isFoundDocument(): boolean;
    isNoDocument(): boolean;
    isUnknownDocument(): boolean;
    isEqual(other: Document_2 | null | undefined): boolean;
    mutableCopy(): MutableDocument;
    toString(): string;
}

/** Miscellaneous collection types / constants. */
declare type MutableDocumentMap = SortedMap<DocumentKey, MutableDocument>;

/**
 * A mutation describes a self-contained change to a document. Mutations can
 * create, replace, delete, and update subsets of documents.
 *
 * Mutations not only act on the value of the document but also its version.
 *
 * For local mutations (mutations that haven't been committed yet), we preserve
 * the existing version for Set and Patch mutations. For Delete mutations, we
 * reset the version to 0.
 *
 * Here's the expected transition table.
 *
 * MUTATION           APPLIED TO            RESULTS IN
 *
 * SetMutation        Document(v3)          Document(v3)
 * SetMutation        NoDocument(v3)        Document(v0)
 * SetMutation        InvalidDocument(v0)   Document(v0)
 * PatchMutation      Document(v3)          Document(v3)
 * PatchMutation      NoDocument(v3)        NoDocument(v3)
 * PatchMutation      InvalidDocument(v0)   UnknownDocument(v3)
 * DeleteMutation     Document(v3)          NoDocument(v0)
 * DeleteMutation     NoDocument(v3)        NoDocument(v0)
 * DeleteMutation     InvalidDocument(v0)   NoDocument(v0)
 *
 * For acknowledged mutations, we use the updateTime of the WriteResponse as
 * the resulting version for Set and Patch mutations. As deletes have no
 * explicit update time, we use the commitTime of the WriteResponse for
 * Delete mutations.
 *
 * If a mutation is acknowledged by the backend but fails the precondition check
 * locally, we transition to an `UnknownDocument` and rely on Watch to send us
 * the updated version.
 *
 * Field transforms are used only with Patch and Set Mutations. We use the
 * `updateTransforms` message to store transforms, rather than the `transforms`s
 * messages.
 *
 * ## Subclassing Notes
 *
 * Every type of mutation needs to implement its own applyToRemoteDocument() and
 * applyToLocalView() to implement the actual behavior of applying the mutation
 * to some source document (see `setMutationApplyToRemoteDocument()` for an
 * example).
 */
declare abstract class Mutation {
    abstract readonly type: MutationType;
    abstract readonly key: DocumentKey;
    abstract readonly precondition: Precondition;
    abstract readonly fieldTransforms: FieldTransform[];
    /**
     * Returns a `FieldMask` representing the fields that will be changed by
     * applying this mutation. Returns `null` if the mutation will overwrite the
     * entire document.
     */
    abstract getFieldMask(): FieldMask | null;
}

/**
 * A batch of mutations that will be sent as one unit to the backend.
 */
declare class MutationBatch {
    batchId: BatchId;
    localWriteTime: Timestamp;
    baseMutations: Mutation[];
    mutations: Mutation[];
    /**
     * @param batchId - The unique ID of this mutation batch.
     * @param localWriteTime - The original write time of this mutation.
     * @param baseMutations - Mutations that are used to populate the base
     * values when this mutation is applied locally. This can be used to locally
     * overwrite values that are persisted in the remote document cache. Base
     * mutations are never sent to the backend.
     * @param mutations - The user-provided mutations in this mutation batch.
     * User-provided mutations are applied both locally and remotely on the
     * backend.
     */
    constructor(batchId: BatchId, localWriteTime: Timestamp, baseMutations: Mutation[], mutations: Mutation[]);
    /**
     * Applies all the mutations in this MutationBatch to the specified document
     * to compute the state of the remote document
     *
     * @param document - The document to apply mutations to.
     * @param batchResult - The result of applying the MutationBatch to the
     * backend.
     */
    applyToRemoteDocument(document: MutableDocument, batchResult: MutationBatchResult): void;
    /**
     * Computes the local view of a document given all the mutations in this
     * batch.
     *
     * @param document - The document to apply mutations to.
     * @param mutatedFields - Fields that have been updated before applying this mutation batch.
     * @returns A `FieldMask` representing all the fields that are mutated.
     */
    applyToLocalView(document: MutableDocument, mutatedFields: FieldMask | null): FieldMask | null;
    /**
     * Computes the local view for all provided documents given the mutations in
     * this batch. Returns a `DocumentKey` to `Mutation` map which can be used to
     * replace all the mutation applications.
     */
    applyToLocalDocumentSet(documentMap: OverlayedDocumentMap, documentsWithoutRemoteVersion: DocumentKeySet): MutationMap;
    keys(): DocumentKeySet;
    isEqual(other: MutationBatch): boolean;
}

/** The result of applying a mutation batch to the backend. */
declare class MutationBatchResult {
    readonly batch: MutationBatch;
    readonly commitVersion: SnapshotVersion;
    readonly mutationResults: MutationResult[];
    /**
     * A pre-computed mapping from each mutated document to the resulting
     * version.
     */
    readonly docVersions: DocumentVersionMap;
    private constructor();
    /**
     * Creates a new MutationBatchResult for the given batch and results. There
     * must be one result for each mutation in the batch. This static factory
     * caches a document=&gt;version mapping (docVersions).
     */
    static from(batch: MutationBatch, commitVersion: SnapshotVersion, results: MutationResult[]): MutationBatchResult;
}

declare type MutationMap = DocumentKeyMap<Mutation>;

/** A queue of mutations to apply to the remote store. */
declare interface MutationQueue {
    /** Returns true if this queue contains no mutation batches. */
    checkEmpty(transaction: PersistenceTransaction): PersistencePromise<boolean>;
    /**
     * Creates a new mutation batch and adds it to this mutation queue.
     *
     * @param transaction - The transaction this operation is scoped to.
     * @param localWriteTime - The original write time of this mutation.
     * @param baseMutations - Mutations that are used to populate the base values
     * when this mutation is applied locally. These mutations are used to locally
     * overwrite values that are persisted in the remote document cache.
     * @param mutations - The user-provided mutations in this mutation batch.
     */
    addMutationBatch(transaction: PersistenceTransaction, localWriteTime: Timestamp, baseMutations: Mutation[], mutations: Mutation[]): PersistencePromise<MutationBatch>;
    /**
     * Loads the mutation batch with the given batchId.
     */
    lookupMutationBatch(transaction: PersistenceTransaction, batchId: BatchId): PersistencePromise<MutationBatch | null>;
    /**
     * Gets the first unacknowledged mutation batch after the passed in batchId
     * in the mutation queue or null if empty.
     *
     * @param batchId - The batch to search after, or BATCHID_UNKNOWN for the
     * first mutation in the queue.
     *
     * @returns the next mutation or null if there wasn't one.
     */
    getNextMutationBatchAfterBatchId(transaction: PersistenceTransaction, batchId: BatchId): PersistencePromise<MutationBatch | null>;
    /**
     * Gets the largest (latest) batch id in mutation queue for the current user
     * that is pending server response, returns `BATCHID_UNKNOWN` if the queue is
     * empty.
     *
     * @returns the largest batch id in the mutation queue that is not
     * acknowledged.
     */
    getHighestUnacknowledgedBatchId(transaction: PersistenceTransaction): PersistencePromise<BatchId>;
    /** Gets all mutation batches in the mutation queue. */
    getAllMutationBatches(transaction: PersistenceTransaction): PersistencePromise<MutationBatch[]>;
    /**
     * Finds all mutation batches that could possibly affect the given
     * document key. Not all mutations in a batch will necessarily affect the
     * document key, so when looping through the batch you'll need to check that
     * the mutation itself matches the key.
     *
     * Batches are guaranteed to be in sorted order.
     *
     * Note that because of this requirement implementations are free to return
     * mutation batches that don't contain the document key at all if it's
     * convenient.
     */
    getAllMutationBatchesAffectingDocumentKey(transaction: PersistenceTransaction, documentKey: DocumentKey): PersistencePromise<MutationBatch[]>;
    /**
     * Finds all mutation batches that could possibly affect the given set of
     * document keys. Not all mutations in a batch will necessarily affect each
     * key, so when looping through the batch you'll need to check that the
     * mutation itself matches the key.
     *
     * Batches are guaranteed to be in sorted order.
     *
     * Note that because of this requirement implementations are free to return
     * mutation batches that don't contain any of the document keys at all if it's
     * convenient.
     */
    getAllMutationBatchesAffectingDocumentKeys(transaction: PersistenceTransaction, documentKeys: SortedMap<DocumentKey, unknown>): PersistencePromise<MutationBatch[]>;
    /**
     * Finds all mutation batches that could affect the results for the given
     * query. Not all mutations in a batch will necessarily affect the query, so
     * when looping through the batch you'll need to check that the mutation
     * itself matches the query.
     *
     * Batches are guaranteed to be in sorted order.
     *
     * Note that because of this requirement implementations are free to return
     * mutation batches that don't match the query at all if it's convenient.
     *
     * NOTE: A PatchMutation does not need to include all fields in the query
     * filter criteria in order to be a match (but any fields it does contain do
     * need to match).
     */
    getAllMutationBatchesAffectingQuery(transaction: PersistenceTransaction, query: Query_2): PersistencePromise<MutationBatch[]>;
    /**
     * Removes the given mutation batch from the queue. This is useful in two
     * circumstances:
     *
     * + Removing an applied mutation from the head of the queue
     * + Removing a rejected mutation from anywhere in the queue
     *
     * Multi-Tab Note: This operation should only be called by the primary client.
     */
    removeMutationBatch(transaction: PersistenceTransaction, batch: MutationBatch): PersistencePromise<void>;
    /**
     * Performs a consistency check, examining the mutation queue for any
     * leaks, if possible.
     */
    performConsistencyCheck(transaction: PersistenceTransaction): PersistencePromise<void>;
}

/** The result of successfully applying a mutation to the backend. */
declare class MutationResult {
    /**
     * The version at which the mutation was committed:
     *
     * - For most operations, this is the updateTime in the WriteResult.
     * - For deletes, the commitTime of the WriteResponse (because deletes are
     *   not stored and have no updateTime).
     *
     * Note that these versions can be different: No-op writes will not change
     * the updateTime even though the commitTime advances.
     */
    readonly version: SnapshotVersion;
    /**
     * The resulting fields returned from the backend after a mutation
     * containing field transforms has been committed. Contains one FieldValue
     * for each FieldTransform that was in the mutation.
     *
     * Will be empty if the mutation did not contain any field transforms.
     */
    readonly transformResults: Array<Value | null>;
    constructor(
    /**
     * The version at which the mutation was committed:
     *
     * - For most operations, this is the updateTime in the WriteResult.
     * - For deletes, the commitTime of the WriteResponse (because deletes are
     *   not stored and have no updateTime).
     *
     * Note that these versions can be different: No-op writes will not change
     * the updateTime even though the commitTime advances.
     */
    version: SnapshotVersion, 
    /**
     * The resulting fields returned from the backend after a mutation
     * containing field transforms has been committed. Contains one FieldValue
     * for each FieldTransform that was in the mutation.
     *
     * Will be empty if the mutation did not contain any field transforms.
     */
    transformResults: Array<Value | null>);
}

declare const enum MutationType {
    Set = 0,
    Patch = 1,
    Delete = 2,
    Verify = 3
}

/**
 * Represents a Query saved by the SDK in its local storage.
 */
declare interface NamedQuery {
    /** The name of the query. */
    readonly name: string;
    /** The underlying query associated with `name`. */
    readonly query: Query_2;
    /** The time at which the results for this query were read. */
    readonly readTime: SnapshotVersion;
}

/** Properties of a NamedQuery. */
declare interface NamedQuery_2 {
    /** NamedQuery name */
    name?: string | null;
    /** NamedQuery bundledQuery */
    bundledQuery?: BundledQuery | null;
    /** NamedQuery readTime */
    readTime?: Timestamp_2 | null;
}

/**
 *
 * Creates an expression that performs a logical 'NOR' operation on multiple filter conditions.
 *
 * @example
 * ```typescript
 * // Check if neither the 'age' field is greater than 18 nor the 'city' field is "London"
 * const condition = nor(
 *   greaterThan("age", 18),
 *   equal("city", "London")
 * );
 * ```
 *
 * @param first - The first filter condition.
 * @param second - The second filter condition.
 * @param more - Additional filter conditions to 'NOR' together.
 * @returns A new {@link @firebase/firestore/pipelines#BooleanExpression} representing the logical 'NOR' operation.
 */
export declare function nor(first: BooleanExpression, second: BooleanExpression, ...more: BooleanExpression[]): BooleanExpression;

/**
 *
 * Creates an expression that negates a filter condition.
 *
 * @example
 * ```typescript
 * // Find documents where the 'completed' field is NOT true
 * not(equal("completed", true));
 * ```
 *
 * @param booleanExpr - The filter condition to negate.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the negated filter condition.
 */
export declare function not(booleanExpr: BooleanExpression): BooleanExpression;

/**
 *
 * Creates an expression that checks if two expressions are not equal.
 *
 * @example
 * ```typescript
 * // Check if the 'status' field is not equal to field 'finalState'
 * notEqual(field("status"), field("finalState"));
 * ```
 *
 * @param left - The first expression to compare.
 * @param right - The second expression to compare.
 * @returns A new `Expression` representing the inequality comparison.
 */
export declare function notEqual(left: Expression, right: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if an expression is not equal to a constant value.
 *
 * @example
 * ```typescript
 * // Check if the 'status' field is not equal to "completed"
 * notEqual(field("status"), "completed");
 * ```
 *
 * @param expression - The expression to compare.
 * @param value - The constant value to compare to.
 * @returns A new `Expression` representing the inequality comparison.
 */
export declare function notEqual(expression: Expression, value: unknown): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is not equal to an expression.
 *
 * @example
 * ```typescript
 * // Check if the 'status' field is not equal to the value of 'expectedStatus'
 * notEqual("status", field("expectedStatus"));
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param expression - The expression to compare to.
 * @returns A new `Expression` representing the inequality comparison.
 */
export declare function notEqual(fieldName: string, expression: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is not equal to a constant value.
 *
 * @example
 * ```typescript
 * // Check if the 'country' field is not equal to "USA"
 * notEqual("country", "USA");
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param value - The constant value to compare to.
 * @returns A new `Expression` representing the inequality comparison.
 */
export declare function notEqual(fieldName: string, value: unknown): BooleanExpression;

/**
 *
 * Creates an expression that checks if an expression is not equal to any of the provided values
 * or expressions.
 *
 * @example
 * ```typescript
 * // Check if the 'status' field is neither "pending" nor the value of 'rejectedStatus'
 * notEqualAny(field("status"), ["pending", field("rejectedStatus")]);
 * ```
 *
 * @param element - The expression to compare.
 * @param values - The values to check against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'NOT IN' comparison.
 */
export declare function notEqualAny(element: Expression, values: Array<Expression | unknown>): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is not equal to any of the provided values
 * or expressions.
 *
 * @example
 * ```typescript
 * // Check if the 'status' field is neither "pending" nor the value of 'rejectedStatus'
 * notEqualAny("status", [constant("pending"), field("rejectedStatus")]);
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param values - The values to check against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'NOT IN' comparison.
 */
export declare function notEqualAny(fieldName: string, values: Array<Expression | unknown>): BooleanExpression;

/**
 *
 * Creates an expression that checks if an expression is not equal to any of the provided values
 * or expressions.
 *
 * @example
 * ```typescript
 * // Check if the 'status' field is neither "pending" nor the value of the field 'rejectedStatus'
 * notEqualAny(field("status"), ["pending", field("rejectedStatus")]);
 * ```
 *
 * @param element - The expression to compare.
 * @param arrayExpression - The values to check against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'NOT IN' comparison.
 */
export declare function notEqualAny(element: Expression, arrayExpression: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value is not equal to any of the values in the evaluated expression.
 *
 * @example
 * ```typescript
 * // Check if the 'status' field is not equal to any value in the field 'rejectedStatuses'
 * notEqualAny("status", field("rejectedStatuses"));
 * ```
 *
 * @param fieldName - The field name to compare.
 * @param arrayExpression - The values to check against.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'NOT IN' comparison.
 */
export declare function notEqualAny(fieldName: string, arrayExpression: Expression): BooleanExpression;

/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * A map implementation that uses objects as keys. Objects must have an
 * associated equals function and must be immutable. Entries in the map are
 * stored together with the key being produced from the mapKeyFn. This map
 * automatically handles collisions of keys.
 */
declare class ObjectMap<KeyType, ValueType> {
    private mapKeyFn;
    private equalsFn;
    /**
     * The inner map for a key/value pair. Due to the possibility of collisions we
     * keep a list of entries that we do a linear search through to find an actual
     * match. Note that collisions should be rare, so we still expect near
     * constant time lookups in practice.
     */
    private inner;
    /** The number of entries stored in the map */
    private innerSize;
    constructor(mapKeyFn: (key: KeyType) => string, equalsFn: (l: KeyType, r: KeyType) => boolean);
    /** Get a value for this key, or undefined if it does not exist. */
    get(key: KeyType): ValueType | undefined;
    has(key: KeyType): boolean;
    /** Put this key and value in the map. */
    set(key: KeyType, value: ValueType): void;
    /**
     * Remove this key from the map. Returns a boolean if anything was deleted.
     */
    delete(key: KeyType): boolean;
    forEach(fn: (key: KeyType, val: ValueType) => void): void;
    isEmpty(): boolean;
    size(): number;
}

/**
 * An ObjectValue represents a MapValue in the Firestore Proto and offers the
 * ability to add and remove fields (via the ObjectValueBuilder).
 */
declare class ObjectValue {
    readonly value: {
        mapValue: MapValue;
    };
    constructor(value: {
        mapValue: MapValue;
    });
    static empty(): ObjectValue;
    /**
     * Returns the value at the given path or null.
     *
     * @param path - the path to search
     * @returns The value at the path or null if the path is not set.
     */
    field(path: FieldPath_2): Value | null;
    /**
     * Sets the field to the provided value.
     *
     * @param path - The field path to set.
     * @param value - The value to set.
     */
    set(path: FieldPath_2, value: Value): void;
    /**
     * Sets the provided fields to the provided values.
     *
     * @param data - A map of fields to values (or null for deletes).
     */
    setAll(data: Map<FieldPath_2, Value | null>): void;
    /**
     * Removes the field at the specified path. If there is no field at the
     * specified path, nothing is changed.
     *
     * @param path - The field path to remove.
     */
    delete(path: FieldPath_2): void;
    isEqual(other: ObjectValue): boolean;
    /**
     * Returns the map that contains the leaf element of `path`. If the parent
     * entry does not yet exist, or if it is not a map, a new map will be created.
     */
    private getFieldsMap;
    /**
     * Modifies `fieldsMap` by adding, replacing or deleting the specified
     * entries.
     */
    private applyChanges;
    clone(): ObjectValue;
}

/**
 * Initializes and wires components that are needed to interface with the local
 * cache. Implementations override `initialize()` to provide all components.
 */
declare interface OfflineComponentProvider {
    readonly kind: Kind;
    persistence: Persistence;
    sharedClientState: SharedClientState;
    localStore: LocalStore;
    gcScheduler: Scheduler | null;
    indexBackfillerScheduler: Scheduler | null;
    synchronizeTabs: boolean;
    initialize(cfg: ComponentConfiguration): Promise<void>;
    terminate(): Promise<void>;
}

declare interface OfflineComponentProviderFactory {
    build(onlineComponents: OnlineComponentProvider): OfflineComponentProvider;
}

/**
 * Options defining how an OffsetStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(offset:1)}.
 */
export declare type OffsetStageOptions = StageOptions & {
    /**
     * The number of documents to skip.
     */
    offset: number;
};

/**
 * Utility type to create an type that only allows one
 * property of the Type param T to be set.
 *
 * @example
 * ```typescript
 * type XorY = OneOf<{ x: unknown, y: unknown }>
 * let a = { x: "foo" }           // OK
 * let b = { y: "foo" }           // OK
 * let c = { a: "foo", y: "foo" } // Not OK
 * ```
 */
export declare type OneOf<T> = {
    [K in keyof T]: Pick<T, K> & {
        [P in Exclude<keyof T, K>]?: undefined;
    };
}[keyof T];

/**
 * Initializes and wires the components that are needed to interface with the
 * network.
 */
declare class OnlineComponentProvider {
    static readonly provider: OnlineComponentProviderFactory;
    protected localStore: LocalStore;
    protected sharedClientState: SharedClientState;
    datastore: Datastore;
    eventManager: EventManager;
    remoteStore: RemoteStore;
    syncEngine: SyncEngine;
    initialize(offlineComponentProvider: OfflineComponentProvider, cfg: ComponentConfiguration): Promise<void>;
    createEventManager(cfg: ComponentConfiguration): EventManager;
    createDatastore(cfg: ComponentConfiguration): Datastore;
    createRemoteStore(cfg: ComponentConfiguration): RemoteStore;
    createSyncEngine(cfg: ComponentConfiguration, startAsPrimary: boolean): SyncEngine;
    terminate(): Promise<void>;
}

declare interface OnlineComponentProviderFactory {
    build(): OnlineComponentProvider;
}

/**
 * Describes the online state of the Firestore client. Note that this does not
 * indicate whether or not the remote store is trying to connect or not. This is
 * primarily used by the View / EventManager code to change their behavior while
 * offline (e.g. get() calls shouldn't wait for data from the server and
 * snapshot events should set metadata.isFromCache=true).
 *
 * The string values should not be changed since they are persisted in
 * WebStorage.
 */
declare const enum OnlineState {
    /**
     * The Firestore client is in an unknown online state. This means the client
     * is either not actively trying to establish a connection or it is currently
     * trying to establish a connection, but it has not succeeded or failed yet.
     * Higher-level components should not operate in offline mode.
     */
    Unknown = "Unknown",
    /**
     * The client is connected and the connections are healthy. This state is
     * reached after a successful connection and there has been at least one
     * successful message received from the backends.
     */
    Online = "Online",
    /**
     * The client is either trying to establish a connection but failing, or it
     * has been explicitly marked offline via a call to disableNetwork().
     * Higher-level components should operate in offline mode.
     */
    Offline = "Offline"
}

declare const enum Operator {
    LESS_THAN = "<",
    LESS_THAN_OR_EQUAL = "<=",
    EQUAL = "==",
    NOT_EQUAL = "!=",
    GREATER_THAN = ">",
    GREATER_THAN_OR_EQUAL = ">=",
    ARRAY_CONTAINS = "array-contains",
    IN = "in",
    NOT_IN = "not-in",
    ARRAY_CONTAINS_ANY = "array-contains-any"
}

declare interface OptionDefinition {
    serverName: string;
    nestedOptions?: OptionsDefinitions;
}

declare type OptionsDefinitions = Record<string, OptionDefinition>;

declare class OptionsUtil {
    private optionDefinitions;
    constructor(optionDefinitions: OptionsDefinitions);
    private _getKnownOptions;
    getOptionsProto(context: ParseContext, knownOptions: Record<string, unknown>, optionsOverride?: Record<string, unknown>): ApiClientObjectMap<Value> | undefined;
}

/**
 *
 * Creates an expression that performs a logical 'OR' operation on multiple filter conditions.
 *
 * @example
 * ```typescript
 * // Check if the 'age' field is greater than 18 OR the 'city' field is "London" OR
 * // the 'status' field is "active"
 * const condition = or(greaterThan("age", 18), equal("city", "London"), equal("status", "active"));
 * ```
 *
 * @param first - The first filter condition.
 * @param second - The second filter condition.
 * @param more - Additional filter conditions to 'OR' together.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logical 'OR' operation.
 */
export declare function or(first: BooleanExpression, second: BooleanExpression, ...more: BooleanExpression[]): BooleanExpression;

/**
 * An ordering on a field, in some Direction. Direction defaults to ASCENDING.
 */
declare class OrderBy {
    readonly field: FieldPath_2;
    readonly dir: Direction;
    constructor(field: FieldPath_2, dir?: Direction);
}

declare type OrderDirection = 'DIRECTION_UNSPECIFIED' | 'ASCENDING' | 'DESCENDING';

/**
 *
 * Represents an ordering criterion for sorting documents in a Firestore pipeline.
 *
 * You create `Ordering` instances using the `ascending` and `descending` helper functions.
 */
export declare class Ordering implements ProtoValueSerializable, UserData {
    readonly expr: Expression;
    readonly direction: 'ascending' | 'descending';
    readonly _methodName: string | undefined;
    constructor(expr: Expression, direction: 'ascending' | 'descending', _methodName: string | undefined);
    /**
     * @private
     * @internal
     */
    _toProto(serializer: JsonProtoSerializer): Value;
    /**
     * @private
     * @internal
     */
    _readUserData(context: ParseContext): void;
    _protoValueType: 'ProtoValue';
}

/**
 * Representation of an overlay computed by Firestore.
 *
 * Holds information about a mutation and the largest batch id in Firestore when
 * the mutation was created.
 */
declare class Overlay {
    readonly largestBatchId: number;
    readonly mutation: Mutation;
    constructor(largestBatchId: number, mutation: Mutation);
    getKey(): DocumentKey;
    isEqual(other: Overlay | null): boolean;
    toString(): string;
}

/**
 * Represents a local view (overlay) of a document, and the fields that are
 * locally mutated.
 */
declare class OverlayedDocument {
    readonly overlayedDocument: Document_2;
    /**
     * The fields that are locally mutated by patch mutations.
     *
     * If the overlayed	document is from set or delete mutations, this is `null`.
     * If there is no overlay (mutation) for the document, this is an empty `FieldMask`.
     */
    readonly mutatedFields: FieldMask | null;
    constructor(overlayedDocument: Document_2, 
    /**
     * The fields that are locally mutated by patch mutations.
     *
     * If the overlayed	document is from set or delete mutations, this is `null`.
     * If there is no overlay (mutation) for the document, this is an empty `FieldMask`.
     */
    mutatedFields: FieldMask | null);
}

declare type OverlayedDocumentMap = DocumentKeyMap<OverlayedDocument>;

declare type OverlayMap = DocumentKeyMap<Overlay>;

/**
 *
 * Creates an expression that returns the parent document reference of a document reference.
 *
 * @example
 * ```typescript
 * // Get the parent document reference of a document reference.
 * parent(myDocumentReference);
 * ```
 *
 * @param documentPath - A string path or DocumentReference to get the parent from.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the parent operation.
 */
declare function parent_2(documentPath: string | DocumentReference): FunctionExpression;

/**
 *
 * Creates an expression that returns the parent document reference of a document reference.
 *
 * @example
 * ```typescript
 * // Get the parent document reference of a document reference.
 * parent(field("__path__"));
 * ```
 *
 * @param documentPathExpr - An Expression evaluating to a document reference.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the parent operation.
 */
declare function parent_2(documentPathExpr: Expression): FunctionExpression;
export { parent_2 as parent }

declare interface ParseContext {
    readonly settings: ContextSettings;
    readonly databaseId: DatabaseId;
    readonly serializer: JsonProtoSerializer;
    readonly ignoreUndefinedProperties: boolean;
    fieldTransforms: FieldTransform[];
    fieldMask: FieldPath_2[];

/** A "context" object passed around while parsing user data. */
declare class ParseContextImpl implements ParseContext {
    readonly settings: ContextSettings;
    readonly databaseId: DatabaseId;
    readonly serializer: JsonProtoSerializer;
    readonly ignoreUndefinedProperties: boolean;
    readonly fieldTransforms: FieldTransform[];
    readonly fieldMask: FieldPath_2[];
    /**
     * Initializes a ParseContext with the given source and path.
     *
     * @param settings - The settings for the parser.
     * @param databaseId - The database ID of the Firestore instance.
     * @param serializer - The serializer to use to generate the Value proto.
     * @param ignoreUndefinedProperties - Whether to ignore undefined properties
     * rather than throw.
     * @param fieldTransforms - A mutable list of field transforms encountered
     * while parsing the data.
     * @param fieldMask - A mutable list of field paths encountered while parsing
     * the data.
     *
     * TODO(b/34871131): We don't support array paths right now, so path can be
     * null to indicate the context represents any location within an array (in
     * which case certain features will not work and errors will be somewhat
     * compromised).
     */
    constructor(settings: ContextSettings, databaseId: DatabaseId, serializer: JsonProtoSerializer, ignoreUndefinedProperties: boolean, fieldTransforms?: FieldTransform[], fieldMask?: FieldPath_2[]);
    get path(): FieldPath_2 | undefined;
    get dataSource(): UserDataSource;
    /** Returns a new context with the specified settings overwritten. */
    contextWith(configuration: Partial<ContextSettings>): ParseContextImpl;
    childContextForField(field: string): ParseContextImpl;
    childContextForFieldPath(field: FieldPath_2): ParseContextImpl;
    childContextForArray(index: number): ParseContextImpl;
    createError(reason: string): FirestoreError;
    /** Returns 'true' if 'fieldPath' was traversed when creating this context. */
    contains(fieldPath: FieldPath_2): boolean;
    private validatePath;
    private validatePathSegment;
}

/**
 * Similar to TypeScript's `Partial<T>`, but allows nested fields to be
 * omitted and FieldValues to be passed in as property values.
 */
export declare type PartialWithFieldValue<T> = Partial<T> | (T extends Primitive ? T : T extends {} ? {
    [K in keyof T]?: PartialWithFieldValue<T[K]> | FieldValue;
} : never);

/**
 * Persistence is the lowest-level shared interface to persistent storage in
 * Firestore.
 *
 * Persistence is used to create MutationQueue and RemoteDocumentCache
 * instances backed by persistence (which might be in-memory or LevelDB).
 *
 * Persistence also exposes an API to create and run PersistenceTransactions
 * against persistence. All read / write operations must be wrapped in a
 * transaction. Implementations of PersistenceTransaction / Persistence only
 * need to guarantee that writes made against the transaction are not made to
 * durable storage until the transaction resolves its PersistencePromise.
 * Since memory-only storage components do not alter durable storage, they are
 * free to ignore the transaction.
 *
 * This contract is enough to allow the LocalStore be be written
 * independently of whether or not the stored state actually is durably
 * persisted. If persistent storage is enabled, writes are grouped together to
 * avoid inconsistent state that could cause crashes.
 *
 * Concretely, when persistent storage is enabled, the persistent versions of
 * MutationQueue, RemoteDocumentCache, and others (the mutators) will
 * defer their writes into a transaction. Once the local store has completed
 * one logical operation, it commits the transaction.
 *
 * When persistent storage is disabled, the non-persistent versions of the
 * mutators ignore the transaction. This short-cut is allowed because
 * memory-only storage leaves no state so it cannot be inconsistent.
 *
 * This simplifies the implementations of the mutators and allows memory-only
 * implementations to supplement the persistent ones without requiring any
 * special dual-store implementation of Persistence. The cost is that the
 * LocalStore needs to be slightly careful about the order of its reads and
 * writes in order to avoid relying on being able to read back uncommitted
 * writes.
 */
declare interface Persistence {
    /**
     * Whether or not this persistence instance has been started.
     */
    readonly started: boolean;
    readonly referenceDelegate: ReferenceDelegate;
    /** Starts persistence. */
    start(): Promise<void>;
    /**
     * Releases any resources held during eager shutdown.
     */
    shutdown(): Promise<void>;
    /**
     * Registers a listener that gets called when the database receives a
     * version change event indicating that it has deleted.
     *
     * PORTING NOTE: This is only used for Web multi-tab.
     */
    setDatabaseDeletedListener(databaseDeletedListener: () => Promise<void>): void;
    /**
     * Adjusts the current network state in the client's metadata, potentially
     * affecting the primary lease.
     *
     * PORTING NOTE: This is only used for Web multi-tab.
     */
    setNetworkEnabled(networkEnabled: boolean): void;
    /**
     * Returns GlobalCache representing a general purpose cache for global values.
     */
    getGlobalsCache(): GlobalsCache;
    /**
     * Returns a MutationQueue representing the persisted mutations for the
     * given user.
     *
     * Note: The implementation is free to return the same instance every time
     * this is called for a given user. In particular, the memory-backed
     * implementation does this to emulate the persisted implementation to the
     * extent possible (e.g. in the case of uid switching from
     * sally=&gt;jack=&gt;sally, sally's mutation queue will be preserved).
     */
    getMutationQueue(user: User, indexManager: IndexManager): MutationQueue;
    /**
     * Returns a TargetCache representing the persisted cache of targets.
     *
     * Note: The implementation is free to return the same instance every time
     * this is called. In particular, the memory-backed implementation does this
     * to emulate the persisted implementation to the extent possible.
     */
    getTargetCache(): TargetCache;
    /**
     * Returns a RemoteDocumentCache representing the persisted cache of remote
     * documents.
     *
     * Note: The implementation is free to return the same instance every time
     * this is called. In particular, the memory-backed implementation does this
     * to emulate the persisted implementation to the extent possible.
     */
    getRemoteDocumentCache(): RemoteDocumentCache;
    /**
     * Returns a BundleCache representing the persisted cache of loaded bundles.
     *
     * Note: The implementation is free to return the same instance every time
     * this is called. In particular, the memory-backed implementation does this
     * to emulate the persisted implementation to the extent possible.
     */
    getBundleCache(): BundleCache;
    /**
     * Returns an IndexManager instance that manages our persisted query indexes.
     *
     * Note: The implementation is free to return the same instance every time
     * this is called. In particular, the memory-backed implementation does this
     * to emulate the persisted implementation to the extent possible.
     */
    getIndexManager(user: User): IndexManager;
    /**
     * Returns a DocumentOverlayCache representing the documents that are mutated
     * locally.
     */
    getDocumentOverlayCache(user: User): DocumentOverlayCache;
    /**
     * Performs an operation inside a persistence transaction. Any reads or writes
     * against persistence must be performed within a transaction. Writes will be
     * committed atomically once the transaction completes.
     *
     * Persistence operations are asynchronous and therefore the provided
     * transactionOperation must return a PersistencePromise. When it is resolved,
     * the transaction will be committed and the Promise returned by this method
     * will resolve.
     *
     * @param action - A description of the action performed by this transaction,
     * used for logging.
     * @param mode - The underlying mode of the IndexedDb transaction. Can be
     * 'readonly', 'readwrite' or 'readwrite-primary'. Transactions marked
     * 'readwrite-primary' can only be executed by the primary client. In this
     * mode, the transactionOperation will not be run if the primary lease cannot
     * be acquired and the returned promise will be rejected with a
     * FAILED_PRECONDITION error.
     * @param transactionOperation - The operation to run inside a transaction.
     * @returns A `Promise` that is resolved once the transaction completes.
     */
    runTransaction<T>(action: string, mode: PersistenceTransactionMode, transactionOperation: (transaction: PersistenceTransaction) => PersistencePromise<T>): Promise<T>;
}

/**
 * PersistencePromise is essentially a re-implementation of Promise except
 * it has a .next() method instead of .then() and .next() and .catch() callbacks
 * are executed synchronously when a PersistencePromise resolves rather than
 * asynchronously (Promise implementations use setImmediate() or similar).
 *
 * This is necessary to interoperate with IndexedDB which will automatically
 * commit transactions if control is returned to the event loop without
 * synchronously initiating another operation on the transaction.
 *
 * NOTE: .then() and .catch() only allow a single consumer, unlike normal
 * Promises.
 */
declare class PersistencePromise<T> {
    private nextCallback;
    private catchCallback;
    private result;
    private error;
    private isDone;
    private callbackAttached;
    constructor(callback: (resolve: Resolver<T>, reject: Rejector) => void);
    catch<R>(fn: (error: Error) => R | PersistencePromise<R>): PersistencePromise<R>;
    next<R>(nextFn?: FulfilledHandler<T, R>, catchFn?: RejectedHandler<R>): PersistencePromise<R>;
    toPromise(): Promise<T>;
    private wrapUserFunction;
    private wrapSuccess;
    private wrapFailure;
    static resolve(): PersistencePromise<void>;
    static resolve<R>(result: R): PersistencePromise<R>;
    static reject<R>(error: Error): PersistencePromise<R>;
    static waitFor(all: {
        forEach: (cb: (el: PersistencePromise<any>) => void) => void;
    }): PersistencePromise<void>;
    /**
     * Given an array of predicate functions that asynchronously evaluate to a
     * boolean, implements a short-circuiting `or` between the results. Predicates
     * will be evaluated until one of them returns `true`, then stop. The final
     * result will be whether any of them returned `true`.
     */
    static or(predicates: Array<() => PersistencePromise<boolean>>): PersistencePromise<boolean>;
    /**
     * Given an iterable, call the given function on each element in the
     * collection and wait for all of the resulting concurrent PersistencePromises
     * to resolve.
     */
    static forEach<R, S>(collection: {
        forEach: (cb: (r: R, s: S) => void) => void;
    }, f: ((r: R, s: S) => PersistencePromise<void>) | ((r: R) => PersistencePromise<void>)): PersistencePromise<void>;
    static forEach<R>(collection: {
        forEach: (cb: (r: R) => void) => void;
    }, f: (r: R) => PersistencePromise<void>): PersistencePromise<void>;
    /**
     * Concurrently map all array elements through asynchronous function.
     */
    static mapArray<T, U>(array: T[], f: (t: T) => PersistencePromise<U>): PersistencePromise<U[]>;
    /**
     * An alternative to recursive PersistencePromise calls, that avoids
     * potential memory problems from unbounded chains of promises.
     *
     * The `action` will be called repeatedly while `condition` is true.
     */
    static doWhile(condition: () => boolean, action: () => PersistencePromise<void>): PersistencePromise<void>;
}

/**
 * A base class representing a persistence transaction, encapsulating both the
 * transaction's sequence numbers as well as a list of onCommitted listeners.
 *
 * When you call Persistence.runTransaction(), it will create a transaction and
 * pass it to your callback. You then pass it to any method that operates
 * on persistence.
 */
declare abstract class PersistenceTransaction {
    private readonly onCommittedListeners;
    abstract readonly currentSequenceNumber: ListenSequenceNumber;
    addOnCommittedListener(listener: () => void): void;
    raiseOnCommittedEvent(): void;
}

/** The different modes supported by `Persistence.runTransaction()`. */
declare type PersistenceTransactionMode = 'readonly' | 'readwrite' | 'readwrite-primary';

/**
 * Provides a persistent cache backed by IndexedDb to the SDK.
 *
 * To use, create an instance using the factory function {@link persistentLocalCache()}, then
 * set the instance to `FirestoreSettings.cache` and call `initializeFirestore` using
 * the settings object.
 */
declare interface PersistentLocalCache {
    kind: 'persistent';
    /**
     * @internal
     */
    _onlineComponentProvider: OnlineComponentProviderFactory;
    /**
     * @internal
     */
    _offlineComponentProvider: OfflineComponentProviderFactory;
}

export declare class Pipeline extends Pipeline_2 {
    /**
     * @internal
     * @private
     * @param db
     * @param userDataReader
     * @param userDataWriter
     * @param stages
     * @param converter
     * @protected
     */
    protected newPipeline(db: Firestore | undefined, stages: Stage[]): Pipeline;
}

/**
 *
 * The Pipeline class provides a flexible and expressive framework for building complex data
 * transformation and query pipelines for Firestore.
 *
 * A pipeline takes data sources, such as Firestore collections or collection groups, and applies
 * a series of stages that are chained together. Each stage takes the output from the previous stage
 * (or the data source) and produces an output for the next stage (or as the final output of the
 * pipeline).
 *
 * Expressions can be used within each stage to filter and transform data through the stage.
 *
 * NOTE: The chained stages do not prescribe exactly how Firestore will execute the pipeline.
 * Instead, Firestore only guarantees that the result is the same as if the chained stages were
 * executed in order.
 *
 * @example
 * ```typescript
 * const db: Firestore; // Assumes a valid firestore instance.
 *
 * // Example 1: Select specific fields and rename 'rating' to 'bookRating'
 * const results1 = await execute(db.pipeline()
 *     .collection("books")
 *     .select("title", "author", field("rating").as("bookRating")));
 *
 * // Example 2: Filter documents where 'genre' is "Science Fiction" and 'published' is after 1950
 * const results2 = await execute(db.pipeline()
 *     .collection("books")
 *     .where(and(field("genre").equal("Science Fiction"), field("published").greaterThan(1950))));
 *
 * // Example 3: Calculate the average rating of books published after 1980
 * const results3 = await execute(db.pipeline()
 *     .collection("books")
 *     .where(field("published").greaterThan(1980))
 *     .aggregate(average(field("rating")).as("averageRating")));
 * ```
 */
declare class Pipeline_2 implements ProtoSerializable<Pipeline_3>, UserData {
    /**
     * @internal
     * @private
     */
    _db: Firestore_2 | undefined;
    /**
     * @internal
     * @private
     */
    readonly userDataReader: UserDataReader | undefined;
    /**
     * @internal
     * @private
     */
    _userDataWriter: AbstractUserDataWriter | undefined;
    /**
     * @internal
     * @private
     */
    readonly stages: Stage[];
    /**
     * @internal
     * @private
     * @param _db
     * @param userDataReader
     * @param _userDataWriter
     * @param stages
     */
    constructor(
    /**
     * @internal
     * @private
     */
    _db: Firestore_2 | undefined, 
    /**
     * @internal
     * @private
     */
    userDataReader: UserDataReader | undefined, 
    /**
     * @internal
     * @private
     */
    _userDataWriter: AbstractUserDataWriter | undefined, 
    /**
     * @internal
     * @private
     */
    stages: Stage[]);
    _readUserData(context: ParseContext): void;
    /**
     * Adds new fields to outputs from previous stages.
     *
     * This stage allows you to compute values on-the-fly based on existing data from previous
     * stages or constants. You can use this to create new fields or overwrite existing ones (if there
     * is name overlaps).
     *
     * The added fields are defined using {@link @firebase/firestore/pipelines#Selectable}s, which can be:
     *
     * <ul>
     *  <li>{@link @firebase/firestore/pipelines#Field}: References an existing document field.</li>
     *  <li>{@link @firebase/firestore/pipelines#Expression}: Either a literal value (see {@link @firebase/firestore/pipelines#(constant:1)}) or a computed value
     *   with an assigned alias using {@link @firebase/firestore/pipelines#Expression.(as:1)}.</li>
     * </ul>
     *
     * @example
     * ```typescript
     * firestore.pipeline().collection("books")
     *   .addFields(
     *     field("rating").as("bookRating"), // Rename 'rating' to 'bookRating'
     *     add(field("quantity"), 5).as("totalCost")  // Calculate 'totalCost'
     *   );
     * ```
     *
     * @param field - The first field to add to the documents, specified as a {@link @firebase/firestore/pipelines#Selectable}.
     * @param additionalFields - Optional additional fields to add to the documents, specified as {@link @firebase/firestore/pipelines#Selectable}s.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    addFields(field: Selectable, ...additionalFields: Selectable[]): Pipeline_2;
    /**
     * Adds new fields to outputs from previous stages.
     *
     * This stage allows you to compute values on-the-fly based on existing data from previous
     * stages or constants. You can use this to create new fields or overwrite existing ones (if there
     * is name overlaps).
     *
     * The added fields are defined using {@link @firebase/firestore/pipelines#Selectable}s, which can be:
     *
     * <ul>
     *  <li>{@link @firebase/firestore/pipelines#Field}: References an existing document field.</li>
     *  <li>{@link @firebase/firestore/pipelines#Expression}: Either a literal value (see {@link @firebase/firestore/pipelines#(constant:1)}) or a computed value
     *   with an assigned alias using {@link @firebase/firestore/pipelines#Expression.(as:1)}.</li>
     * </ul>
     *
     * @example
     * ```typescript
     * firestore.pipeline().collection("books")
     *   .addFields(
     *     field("rating").as("bookRating"), // Rename 'rating' to 'bookRating'
     *     add(field("quantity"), 5).as("totalCost")  // Calculate 'totalCost'
     *   );
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    addFields(options: AddFieldsStageOptions): Pipeline_2;
    /**
     * Remove fields from outputs of previous stages.
     *
     * @example
     * ```typescript
     * firestore.pipeline().collection('books')
     *   // removes field 'rating' and 'cost' from the previous stage outputs.
     *   .removeFields(
     *     field('rating'),
     *     'cost'
     *   );
     * ```
     *
     * @param fieldValue - The first field to remove.
     * @param additionalFields - Optional additional fields to remove.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    removeFields(fieldValue: Field | string, ...additionalFields: Array<Field | string>): Pipeline_2;
    /**
     * Remove fields from outputs of previous stages.
     *
     * @example
     * ```typescript
     * firestore.pipeline().collection('books')
     *   // removes field 'rating' and 'cost' from the previous stage outputs.
     *   .removeFields(
     *     field('rating'),
     *     'cost'
     *   );
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    removeFields(options: RemoveFieldsStageOptions): Pipeline_2;
    /**
     * Defines one or more variables in the pipeline's scope. `define` is used to bind a value to a
     * variable for internal reuse within the pipeline body (accessed via the `variable()` function).
     *
     * This stage is useful for declaring reusable values or intermediate calculations that can be
     * referenced multiple times in later parts of the pipeline, improving readability and
     * maintainability.
     *
     * Each variable is defined using an {@link @firebase/firestore/pipelines#AliasedExpression}, which pairs an expression with a name
     * (alias). The expression can be a simple constant, a field reference, or a complex computation.
     *
     * @example
     * ```typescript
     * db.pipeline().collection("products")
     *   .define(
     *     field("price").multiply(0.9).as("discountedPrice"),
     *     field("stock").add(10).as("newStock")
     *   )
     *   .where(variable("discountedPrice").lessThan(100))
     *   .select(field("name"), variable("newStock"));
     * ```
     *
     * @param aliasedExpression - The first expression to bind to a variable.
     * @param additionalExpressions - Optional additional expression to bind to a variable.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    define(aliasedExpression: AliasedExpression, ...additionalExpressions: AliasedExpression[]): Pipeline_2;
    /**
     * Defines one or more variables in the pipeline's scope. `define` is used to bind a value to a
     * variable for internal reuse within the pipeline body (accessed via the `variable()` function).
     *
     * This stage is useful for declaring reusable values or intermediate calculations that can be
     * referenced multiple times in later parts of the pipeline, improving readability and
     * maintainability.
     *
     * Each variable is defined using an {@link @firebase/firestore/pipelines#AliasedExpression}, which pairs an expression with a name
     * (alias). The expression can be a simple constant, a field reference, or a complex computation.
     *
     * @example
     * ```typescript
     * db.pipeline().collection("products")
     *   .define(
     *     field("price").multiply(0.9).as("discountedPrice"),
     *     field("stock").add(10).as("newStock")
     *   )
     *   .where(variable("discountedPrice").lessThan(100))
     *   .select(field("name"), variable("newStock"));
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    define(options: DefineStageOptions): Pipeline_2;
    /**
     * Converts this Pipeline into an expression that evaluates to an array of results.
     *
     * <p>Result Unwrapping:</p>
     * <ul>
     *  <li>If the items have a single field, their values are unwrapped and returned directly in the array.</li>
     *  <li>If the items have multiple fields, they are returned as objects in the array</li>
     * </ul>
     *
     * @example
     * ```typescript
     * // Get a list of reviewers for each book
     * db.pipeline().collection("books")
     *     .define(field("id").as("book_id"))
     *     .addFields(
     *         db.pipeline().collection("reviews")
     *             .where(field("book_id").equal(variable("book_id")))
     *             .select(field("reviewer"))
     *             .toArrayExpression()
     *             .as("reviewers")
     *     )
     * ```
     *
     * Output:
     * ```json
     * [
     *   {
     *     "id": "1",
     *     "title": "1984",
     *     "reviewers": ["Alice", "Bob"]
     *   }
     * ]
     * ```
     *
     * Multiple Fields:
     * ```typescript
     * // Get a list of reviews (reviewer and rating) for each book
     * db.pipeline().collection("books")
     *     .define(field("id").as("book_id"))
     *     .addFields(
     *         db.pipeline().collection("reviews")
     *             .where(field("book_id").equal(variable("book_id")))
     *             .select(field("reviewer"), field("rating"))
     *             .toArrayExpression()
     *             .as("reviews"))
     * ```
     *
     * Output:
     * ```json
     * [
     *   {
     *     "id": "1",
     *     "title": "1984",
     *     "reviews": [
     *       { "reviewer": "Alice", "rating": 5 },
     *       { "reviewer": "Bob", "rating": 4 }
     *     ]
     *   }
     * ]
     * ```
     *
     * @returns An `Expression` representing the execution of this pipeline.
     */
    toArrayExpression(): Expression;
    /**
     * Converts this Pipeline into an expression that evaluates to a single scalar result.
     *
     * <p><b>Runtime Validation:</b> The runtime validates that the result set contains zero or one item. If
     * zero items, it evaluates to `null`.</p>
     *
     * <p>Result Unwrapping:</p>
     * <ul>
     *  <li>If the item has a single field, its value is unwrapped and returned directly.</li>
     *  <li>If the item has multiple fields, they are returned as an object.</li>
     * </ul>
     *
     * @example
     * ```typescript
     * // Calculate average rating for a restaurant
     * db.pipeline().collection("restaurants").addFields(
     *   db.pipeline().collection("reviews")
     *     .where(field("restaurant_id").equal(variable("rid")))
     *     .aggregate(average("rating").as("avg"))
     *     // Unwraps the single "avg" field to a scalar double
     *     .toScalarExpression().as("average_rating")
     * )
     * ```
     *
     * Output:
     * ```json
     * {
     *   "name": "The Burger Joint",
     *   "average_rating": 4.5
     * }
     * ```
     *
     * Multiple Fields:
     * ```typescript
     * // Calculate average rating AND count for a restaurant
     * db.pipeline().collection("restaurants").addFields(
     *   db.pipeline().collection("reviews")
     *     .where(field("restaurant_id").equal(variable("rid")))
     *     .aggregate(
     *       average("rating").as("avg"),
     *       count().as("count")
     *     )
     *     // Returns an object with "avg" and "count" fields
     *     .toScalarExpression().as("stats")
     * )
     * ```
     *
     * Output:
     * ```json
     * {
     *   "name": "The Burger Joint",
     *   "stats": {
     *     "avg": 4.5,
     *     "count": 100
     *   }
     * }
     * ```
     *
     * @returns An `Expression` representing the execution of this pipeline.
     */
    toScalarExpression(): Expression;
    /**
     * Selects or creates a set of fields from the outputs of previous stages.
     *
     * <p>The selected fields are defined using {@link @firebase/firestore/pipelines#Selectable} expressions, which can be:
     *
     * <ul>
     *   <li>`string` : Name of an existing field</li>
     *   <li>{@link @firebase/firestore/pipelines#Field}: References an existing field.</li>
     *   <li>{@link @firebase/firestore/pipelines#AliasedExpression}: Represents the result of a function with an assigned alias name using
     *       {@link @firebase/firestore/pipelines#Expression.(as:1)}</li>
     * </ul>
     *
     * <p>If no selections are provided, the output of this stage is empty. Use {@link
     * @firebase/firestore/pipelines#Pipeline.(addFields:1)} instead if only additions are
     * desired.
     *
     * @example
     * ```typescript
     * db.pipeline().collection("books")
     *   .select(
     *     "firstName",
     *     field("lastName"),
     *     field("address").toUpper().as("upperAddress"),
     *   );
     * ```
     *
     * @param selection - The first field to include in the output documents, specified as {@link
     *     @firebase/firestore/pipelines#Selectable} expression or string value representing the field name.
     * @param additionalSelections - Optional additional fields to include in the output documents, specified as {@link
     *     @firebase/firestore/pipelines#Selectable} expressions or `string` values representing field names.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    select(selection: Selectable | string, ...additionalSelections: Array<Selectable | string>): Pipeline_2;
    /**
     * Selects or creates a set of fields from the outputs of previous stages.
     *
     * <p>The selected fields are defined using {@link @firebase/firestore/pipelines#Selectable} expressions, which can be:
     *
     * <ul>
     *   <li>`string`: Name of an existing field</li>
     *   <li>{@link @firebase/firestore/pipelines#Field}: References an existing field.</li>
     *   <li>{@link @firebase/firestore/pipelines#AliasedExpression}: Represents the result of a function with an assigned alias name using
     *       {@link @firebase/firestore/pipelines#Expression.(as:1)}</li>
     * </ul>
     *
     * <p>If no selections are provided, the output of this stage is empty. Use {@link
     * @firebase/firestore/pipelines#Pipeline.(addFields:1)} instead if only additions are
     * desired.
     *
     * @example
     * ```typescript
     * db.pipeline().collection("books")
     *   .select(
     *     "firstName",
     *     field("lastName"),
     *     field("address").toUpper().as("upperAddress"),
     *   );
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    select(options: SelectStageOptions): Pipeline_2;
    /**
     * Filters the documents from previous stages to only include those matching the specified {@link
     * @firebase/firestore/pipelines#BooleanExpression}.
     *
     * <p>This stage allows you to apply conditions to the data, similar to a "WHERE" clause in SQL.
     * You can filter documents based on their field values, using implementations of {@link
     * @firebase/firestore/pipelines#BooleanExpression}, typically including but not limited to:
     *
     * <ul>
     *   <li>field comparators: {@link @firebase/firestore/pipelines#Expression.(equal:1)}, {@link @firebase/firestore/pipelines#Expression.(lessThan:1)}, {@link
     *       @firebase/firestore/pipelines#Expression.(greaterThan:1)}, etc.</li>
     *   <li>logical operators: {@link @firebase/firestore/pipelines#Expression.(and:1)}, {@link @firebase/firestore/pipelines#Expression.(or:1)}, {@link @firebase/firestore/pipelines#Expression.(not:1)}, etc.</li>
     *   <li>advanced functions: {@link @firebase/firestore/pipelines#Expression.(regexMatch:1)}, {@link
     *       @firebase/firestore/pipelines#Expression.(arrayContains:1)}, etc.</li>
     * </ul>
     *
     * @example
     * ```typescript
     * firestore.pipeline().collection("books")
     *   .where(
     *     and(
     *         greaterThan(field("rating"), 4.0),   // Filter for ratings greater than 4.0
     *         field("genre").equal("Science Fiction") // Equivalent to equal("genre", "Science Fiction")
     *     )
     *   );
     * ```
     *
     * @param condition - The {@link @firebase/firestore/pipelines#BooleanExpression} to apply.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    where(condition: BooleanExpression): Pipeline_2;
    /**
     * Filters the documents from previous stages to only include those matching the specified {@link
     * @firebase/firestore/pipelines#BooleanExpression}.
     *
     * <p>This stage allows you to apply conditions to the data, similar to a "WHERE" clause in SQL.
     * You can filter documents based on their field values, using implementations of {@link
     * @firebase/firestore/pipelines#BooleanExpression}, typically including but not limited to:
     *
     * <ul>
     *   <li>field comparators: {@link @firebase/firestore/pipelines#Expression.(eq:1)}, {@link @firebase/firestore/pipelines#Expression.(lt:1)} (less than), {@link
     *       @firebase/firestore/pipelines#Expression.(greaterThan:1)}, etc.</li>
     *   <li>logical operators: {@link @firebase/firestore/pipelines#Expression.(and:1)}, {@link @firebase/firestore/pipelines#Expression.(or:1)}, {@link @firebase/firestore/pipelines#Expression.(not:1)}, etc.</li>
     *   <li>advanced functions: {@link @firebase/firestore/pipelines#Expression.(regexMatch:1)}, {@link
     *       @firebase/firestore/pipelines#Expression.(arrayContains:1)}, etc.</li>
     * </ul>
     *
     * @example
     * ```typescript
     * firestore.pipeline().collection("books")
     *   .where(
     *     and(
     *         greaterThan(field("rating"), 4.0),   // Filter for ratings greater than 4.0
     *         field("genre").equal("Science Fiction") // Equivalent to equal("genre", "Science Fiction")
     *     )
     *   );
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    where(options: WhereStageOptions): Pipeline_2;
    /**
     * Skips the first `offset` number of documents from the results of previous stages.
     *
     * <p>This stage is useful for implementing pagination in your pipelines, allowing you to retrieve
     * results in chunks. It is typically used in conjunction with {@link @firebase/firestore/pipelines#Pipeline.limit} to control the
     * size of each page.
     *
     * @example
     * ```typescript
     * // Retrieve the second page of 20 results
     * firestore.pipeline().collection('books')
     *     .sort(field('published').descending())
     *     .offset(20)  // Skip the first 20 results
     *     .limit(20);   // Take the next 20 results
     * ```
     *
     * @param offset - The number of documents to skip.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    offset(offset: number): Pipeline_2;
    /**
     * Skips the first `offset` number of documents from the results of previous stages.
     *
     * <p>This stage is useful for implementing pagination in your pipelines, allowing you to retrieve
     * results in chunks. It is typically used in conjunction with {@link @firebase/firestore/pipelines#Pipeline.limit} to control the
     * size of each page.
     *
     * @example
     * ```typescript
     * // Retrieve the second page of 20 results
     * firestore.pipeline().collection('books')
     *     .sort(field('published').descending())
     *     .offset(20)  // Skip the first 20 results
     *     .limit(20);   // Take the next 20 results
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    offset(options: OffsetStageOptions): Pipeline_2;
    /**
     * Limits the maximum number of documents returned by previous stages to `limit`.
     *
     * <p>This stage is particularly useful when you want to retrieve a controlled subset of data from
     * a potentially large result set. It's often used for:
     *
     * <ul>
     *   <li>Pagination: In combination with {@link @firebase/firestore/pipelines#Pipeline.offset} to retrieve specific pages of
     *       results.</li>
     *   <li>Limiting Data Retrieval: To prevent excessive data transfer and improve performance,
     *       especially when dealing with large collections.</li>
     * </ul>
     *
     * @example
     * ```typescript
     * // Limit the results to the top 10 highest-rated books
     * firestore.pipeline().collection('books')
     *     .sort(field('rating').descending())
     *     .limit(10);
     * ```
     *
     * @param limit - The maximum number of documents to return.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    limit(limit: number): Pipeline_2;
    /**
     * Limits the maximum number of documents returned by previous stages to `limit`.
     *
     * <p>This stage is particularly useful when you want to retrieve a controlled subset of data from
     * a potentially large result set. It's often used for:
     *
     * <ul>
     *   <li>Pagination: In combination with {@link @firebase/firestore/pipelines#Pipeline.offset} to retrieve specific pages of
     *       results.</li>
     *   <li>Limiting Data Retrieval: To prevent excessive data transfer and improve performance,
     *       especially when dealing with large collections.</li>
     * </ul>
     *
     * @example
     * ```typescript
     * // Limit the results to the top 10 highest-rated books
     * firestore.pipeline().collection('books')
     *     .sort(field('rating').descending())
     *     .limit(10);
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    limit(options: LimitStageOptions): Pipeline_2;
    /**
     * Returns a set of distinct values from the inputs to this stage.
     *
     * This stage runs through the results from previous stages to include only results with
     * unique combinations of {@link @firebase/firestore/pipelines#Expression} values ({@link @firebase/firestore/pipelines#Field}, {@link @firebase/firestore/pipelines#AliasedExpression}, etc).
     *
     * The parameters to this stage are defined using {@link @firebase/firestore/pipelines#Selectable} expressions or strings:
     *
     * <ul>
     *  <li> `string`: Name of an existing field</li>
     *  <li> {@link @firebase/firestore/pipelines#Field}: References an existing document field.</li>
     *  <li> {@link @firebase/firestore/pipelines#AliasedExpression}: Represents the result of a function with an assigned alias name
     *   using {@link @firebase/firestore/pipelines#Expression.(as:1)}.</li>
     * </ul>
     *
     * @example
     * ```typescript
     * // Get a list of unique author names in uppercase and genre combinations.
     * firestore.pipeline().collection("books")
     *     .distinct(toUpper(field("author")).as("authorName"), field("genre"), "publishedAt")
     *     .select("authorName");
     * ```
     *
     * @param group - The {@link @firebase/firestore/pipelines#Selectable} expression or field name to consider when determining
     *     distinct value combinations.
     * @param additionalGroups - Optional additional {@link @firebase/firestore/pipelines#Selectable} expressions to consider when determining distinct
     *     value combinations or strings representing field names.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    distinct(group: string | Selectable, ...additionalGroups: Array<string | Selectable>): Pipeline_2;
    /**
     * Returns a set of distinct values from the inputs to this stage.
     *
     * This stage runs through the results from previous stages to include only results with
     * unique combinations of {@link @firebase/firestore/pipelines#Expression} values ({@link @firebase/firestore/pipelines#Field}, {@link @firebase/firestore/pipelines#AliasedExpression}, etc).
     *
     * The parameters to this stage are defined using {@link @firebase/firestore/pipelines#Selectable} expressions or strings:
     *
     * <ul>
     *  <li>`string`: Name of an existing field</li>
     *  <li>{@link @firebase/firestore/pipelines#Field}: References an existing document field.</li>
     *  <li>{@link @firebase/firestore/pipelines#AliasedExpression}: Represents the result of a function with an assigned alias name
     *   using {@link @firebase/firestore/pipelines#Expression.(as:1)}.</li>
     * </ul>
     *
     * @example
     * ```typescript
     * // Get a list of unique author names in uppercase and genre combinations.
     * firestore.pipeline().collection("books")
     *     .distinct(toUpper(field("author")).as("authorName"), field("genre"), "publishedAt")
     *     .select("authorName");
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    distinct(options: DistinctStageOptions): Pipeline_2;
    /**
     * Performs aggregation operations on the documents from previous stages.
     *
     * This stage allows you to calculate aggregate values over a set of documents. You define the
     * aggregations to perform using {@link @firebase/firestore/pipelines#AliasedAggregate} expressions which are typically results of
     * calling {@link @firebase/firestore/pipelines#Expression.(as:1)} on {@link @firebase/firestore/pipelines#AggregateFunction} instances.
     *
     * @example
     * ```typescript
     * // Calculate the average rating and the total number of books
     * firestore.pipeline().collection("books")
     *     .aggregate(
     *         field("rating").average().as("averageRating"),
     *         countAll().as("totalBooks")
     *     );
     * ```
     *
     * @param accumulator - The first {@link @firebase/firestore/pipelines#AliasedAggregate}, wrapping an {@link @firebase/firestore/pipelines#AggregateFunction}
     *     and providing a name for the accumulated results.
     * @param additionalAccumulators - Optional additional {@link @firebase/firestore/pipelines#AliasedAggregate}, each wrapping an {@link @firebase/firestore/pipelines#AggregateFunction}
     *     and providing a name for the accumulated results.
     * @returns A new Pipeline object with this stage appended to the stage list.
     */
    aggregate(accumulator: AliasedAggregate, ...additionalAccumulators: AliasedAggregate[]): Pipeline_2;
    /**
     * Performs optionally grouped aggregation operations on the documents from previous stages.
     *
     * This stage allows you to calculate aggregate values over a set of documents, optionally
     * grouped by one or more fields or functions. You can specify:
     *
     * <ul>
     *   <li>Grouping Fields or Functions: One or more fields or functions to group the documents
     *       by. For each distinct combination of values in these fields, a separate group is created.
     *       If no grouping fields are provided, a single group containing all documents is used. Not
     *       specifying groups is the same as putting the entire inputs into one group.</li>
     *   <li>Accumulators: One or more accumulation operations to perform within each group. These
     *       are defined using {@link @firebase/firestore/pipelines#AliasedAggregate} expressions, which are typically created by
     *       calling {@link @firebase/firestore/pipelines#Expression.(as:1)} on {@link @firebase/firestore/pipelines#AggregateFunction} instances. Each aggregation
     *       calculates a value (e.g., sum, average, count) based on the documents within its group.</li>
     * </ul>
     *
     * @example
     * ```typescript
     * // Calculate the average rating for each genre.
     * firestore.pipeline().collection("books")
     *   .aggregate({
     *       accumulators: [average(field("rating")).as("avg_rating")],
     *       groups: ["genre"]
     *       });
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage
     * list.
     */
    aggregate(options: AggregateStageOptions): Pipeline_2;
    /**
     * Performs a vector proximity search on the documents from the previous stage, returning the
     * K-nearest documents based on the specified query `vectorValue` and `distanceMeasure`. The
     * returned documents will be sorted in order from nearest to furthest from the query `vectorValue`.
     *
     * @example
     * ```typescript
     * // Find the 10 most similar books based on the book description.
     * const bookDescription = "Lorem ipsum...";
     * const queryVector: number[] = ...; // compute embedding of `bookDescription`
     *
     * firestore.pipeline().collection("books")
     *     .findNearest({
     *       field: 'embedding',
     *       vectorValue: queryVector,
     *       distanceMeasure: 'euclidean',
     *       limit: 10,                        // optional
     *       distanceField: 'computedDistance' // optional
     *     });
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    findNearest(options: FindNearestStageOptions): Pipeline_2;
    /**
     * Add a search stage to the Pipeline. The search stage supports
     * full-text search and geo search expressions.
     *
     * @remarks
     * This must be the first stage of the pipeline. A limited set of expressions are supported in the search stage.
     *
     * @example
     * ```typescript
     * // Full-text search example
     * firestore.pipeline().collection("restaurants")
     * .search({
     *   query: documentMatches("waffles OR pancakes"),
     *   sort: [
     *     score().descending(),
     *   ],
     *   addFields: [
     *     score().as("searchScore"),
     *   ]
     * })
     * ```
     *
     * @example
     * ```typescript
     * // Geo distance search example
     * const queryLocation = new GeoPoint(0, 0);
     * db.pipeline().collection('restaurants').search({
     *   query: field('location').geoDistance(queryLocation).lessThanOrEqual(1000),
     *   sort: [
     *     score().descending(),
     *   ],
     * })
     * ```
     *
     * @param options - An object that specifies parameters for the stage.
     * @return A new `Pipeline` object with this stage appended to the stage list.
     * @beta
     */
    search(options: SearchStageOptions): Pipeline_2;
    /**
     * Sorts the documents from previous stages based on one or more {@link @firebase/firestore/pipelines#Ordering} criteria.
     *
     * <p>This stage allows you to order the results of your pipeline. You can specify multiple {@link
     * @firebase/firestore/pipelines#Ordering} instances to sort by multiple fields in ascending or descending order. If documents
     * have the same value for a field used for sorting, the next specified ordering will be used. If
     * all orderings result in equal comparison, the documents are considered equal and the order is
     * unspecified.
     *
     * @example
     * ```typescript
     * // Sort books by rating in descending order, and then by title in ascending order for books
     * // with the same rating
     * firestore.pipeline().collection("books")
     *     .sort(
     *         field("rating").descending(),
     *         field("title").ascending()
     *     );
     * ```
     *
     * @param ordering - The first {@link @firebase/firestore/pipelines#Ordering} instance specifying the sorting criteria.
     * @param additionalOrderings - Optional additional {@link @firebase/firestore/pipelines#Ordering} instances specifying the additional sorting criteria.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    sort(ordering: Ordering, ...additionalOrderings: Ordering[]): Pipeline_2;
    /**
     * Sorts the documents from previous stages based on one or more {@link @firebase/firestore/pipelines#Ordering} criteria.
     *
     * <p>This stage allows you to order the results of your pipeline. You can specify multiple {@link
     * @firebase/firestore/pipelines#Ordering} instances to sort by multiple fields in ascending or descending order. If documents
     * have the same value for a field used for sorting, the next specified ordering will be used. If
     * all orderings result in equal comparison, the documents are considered equal and the order is
     * unspecified.
     *
     * @example
     * ```typescript
     * // Sort books by rating in descending order, and then by title in ascending order for books
     * // with the same rating
     * firestore.pipeline().collection("books")
     *     .sort(
     *         field("rating").descending(),
     *         field("title").ascending()
     *     );
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    sort(options: SortStageOptions): Pipeline_2;
    /**
     * Fully overwrites all fields in a document with those coming from a nested map.
     *
     * <p>This stage allows you to emit a map value as a document. Each key of the map becomes a field
     * on the document that contains the corresponding value.
     *
     * @example
     * ```typescript
     * // Input.
     * // {
     * //  'name': 'John Doe Jr.',
     * //  'parents': {
     * //    'father': 'John Doe Sr.',
     * //    'mother': 'Jane Doe'
     * //   }
     * // }
     *
     * // Emit parents as document.
     * firestore.pipeline().collection('people').replaceWith('parents');
     *
     * // Output
     * // {
     * //  'father': 'John Doe Sr.',
     * //  'mother': 'Jane Doe'
     * // }
     * ```
     *
     * @param fieldName - The {@link @firebase/firestore/pipelines#Field} field containing the nested map.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    replaceWith(fieldName: string): Pipeline_2;
    /**
     * Fully overwrites all fields in a document with those coming from a map.
     *
     * <p>This stage allows you to emit a map value as a document. Each key of the map becomes a field
     * on the document that contains the corresponding value.
     *
     * @example
     * ```typescript
     * // Input.
     * // {
     * //  'name': 'John Doe Jr.',
     * //  'parents': {
     * //    'father': 'John Doe Sr.',
     * //    'mother': 'Jane Doe'
     * //   }
     * // }
     *
     * // Emit parents as document.
     * firestore.pipeline().collection('people').replaceWith(map({
     *   foo: 'bar',
     *   info: {
     *     name: field('name')
     *   }
     * }));
     *
     * // Output
     * // {
     * //  'father': 'John Doe Sr.',
     * //  'mother': 'Jane Doe'
     * // }
     * ```
     *
     * @param expr - An {@link @firebase/firestore/pipelines#Expression} that when returned evaluates to a map.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    replaceWith(expr: Expression): Pipeline_2;
    /**
     * Fully overwrites all fields in a document with those coming from a map.
     *
     * <p>This stage allows you to emit a map value as a document. Each key of the map becomes a field
     * on the document that contains the corresponding value.
     *
     * @example
     * ```typescript
     * // Input.
     * // {
     * //  'name': 'John Doe Jr.',
     * //  'parents': {
     * //    'father': 'John Doe Sr.',
     * //    'mother': 'Jane Doe'
     * //   }
     * // }
     *
     * // Emit parents as document.
     * firestore.pipeline().collection('people').replaceWith(map({
     *   foo: 'bar',
     *   info: {
     *     name: field('name')
     *   }
     * }));
     *
     * // Output
     * // {
     * //  'father': 'John Doe Sr.',
     * //  'mother': 'Jane Doe'
     * // }
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    replaceWith(options: ReplaceWithStageOptions): Pipeline_2;
    /**
     * Performs a pseudo-random sampling of the documents from the previous stage.
     *
     * <p>This stage will filter documents pseudo-randomly. The parameter specifies how number of
     * documents to be returned.
     *
     * <p>Examples:
     *
     * @example
     * ```typescript
     * // Sample 25 books, if available.
     * firestore.pipeline().collection('books')
     *     .sample(25);
     * ```
     *
     * @param documents - The number of documents to sample.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    sample(documents: number): Pipeline_2;
    /**
     * Performs a pseudo-random sampling of the documents from the previous stage.
     *
     * <p>This stage will filter documents pseudo-randomly. The 'options' parameter specifies how
     * sampling will be performed. See {@link @firebase/firestore/pipelines#SampleStageOptions} for more information.
     *
     * @example
     * ```typescript
     * // Sample 10 books, if available.
     * firestore.pipeline().collection("books")
     *     .sample({ documents: 10 });
     *
     * // Sample 50% of books.
     * firestore.pipeline().collection("books")
     *     .sample({ percentage: 0.5 });
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    sample(options: SampleStageOptions): Pipeline_2;
    /**
     * Performs union of all documents from two pipelines, including duplicates.
     *
     * <p>This stage will pass through documents from previous stage, and also pass through documents
     * from previous stage of the `other` {@link @firebase/firestore/pipelines#Pipeline} given in parameter. The order of documents
     * emitted from this stage is undefined.
     *
     * @example
     * ```typescript
     * // Emit documents from books collection and magazines collection.
     * firestore.pipeline().collection('books')
     *     .union(firestore.pipeline().collection('magazines'));
     * ```
     *
     * @param other - The other {@link @firebase/firestore/pipelines#Pipeline} that is part of union.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    union(other: Pipeline_2): Pipeline_2;
    /**
     * Performs union of all documents from two pipelines, including duplicates.
     *
     * <p>This stage will pass through documents from previous stage, and also pass through documents
     * from previous stage of the `other` {@link @firebase/firestore/pipelines#Pipeline} given in parameter. The order of documents
     * emitted from this stage is undefined.
     *
     * @example
     * ```typescript
     * // Emit documents from books collection and magazines collection.
     * firestore.pipeline().collection('books')
     *     .union(firestore.pipeline().collection('magazines'));
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    union(options: UnionStageOptions): Pipeline_2;
    /**
     * Produces a document for each element in an input array.
     *
     * For each previous stage document, this stage will emit zero or more augmented documents. The
     * input array specified by the `selectable` parameter, will emit an augmented document for each input array element. The input array element will
     * augment the previous stage document by setting the `alias` field  with the array element value.
     *
     * When `selectable` evaluates to a non-array value (ex: number, null, absent), then the stage becomes a no-op for
     * the current input document, returning it as is with the `alias` field absent.
     *
     * No documents are emitted when `selectable` evaluates to an empty array.
     *
     * @example
     * ```typescript
     * // Input:
     * // { "title": "The Hitchhiker's Guide to the Galaxy", "tags": [ "comedy", "space", "adventure" ], ... }
     *
     * // Emit a book document for each tag of the book.
     * firestore.pipeline().collection("books")
     *     .unnest(field("tags").as('tag'), 'tagIndex');
     *
     * // Output:
     * // { "title": "The Hitchhiker's Guide to the Galaxy", "tag": "comedy", "tagIndex": 0, ... }
     * // { "title": "The Hitchhiker's Guide to the Galaxy", "tag": "space", "tagIndex": 1, ... }
     * // { "title": "The Hitchhiker's Guide to the Galaxy", "tag": "adventure", "tagIndex": 2, ... }
     * ```
     *
     * @param selectable - A selectable expression defining the field to unnest and the alias to use for each un-nested element in the output documents.
     * @param indexField - An optional string value specifying the field path to write the offset (starting at zero) into the array the un-nested element is from
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    unnest(selectable: Selectable, indexField?: string): Pipeline_2;
    /**
     * Produces a document for each element in an input array.
     *
     * For each previous stage document, this stage will emit zero or more augmented documents. The
     * input array specified by the `selectable` parameter, will emit an augmented document for each input array element. The input array element will
     * augment the previous stage document by setting the `alias` field  with the array element value.
     *
     * When `selectable` evaluates to a non-array value (ex: number, null, absent), then the stage becomes a no-op for
     * the current input document, returning it as is with the `alias` field absent.
     *
     * No documents are emitted when `selectable` evaluates to an empty array.
     *
     * @example
     * ```typescript
     * // Input:
     * // { "title": "The Hitchhiker's Guide to the Galaxy", "tags": [ "comedy", "space", "adventure" ], ... }
     *
     * // Emit a book document for each tag of the book.
     * firestore.pipeline().collection("books")
     *     .unnest(field("tags").as('tag'), 'tagIndex');
     *
     * // Output:
     * // { "title": "The Hitchhiker's Guide to the Galaxy", "tag": "comedy", "tagIndex": 0, ... }
     * // { "title": "The Hitchhiker's Guide to the Galaxy", "tag": "space", "tagIndex": 1, ... }
     * // { "title": "The Hitchhiker's Guide to the Galaxy", "tag": "adventure", "tagIndex": 2, ... }
     * ```
     *
     * @param options - An object that specifies required and optional parameters for the stage.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    unnest(options: UnnestStageOptions): Pipeline_2;
    /**
     * Adds a raw stage to the pipeline.
     *
     * <p>This method provides a flexible way to extend the pipeline's functionality by adding custom
     * stages. Each raw stage is defined by a unique `name` and a set of `params` that control its
     * behavior.
     *
     * <p>Example (Assuming there is no 'where' stage available in SDK):
     *
     * @example
     * ```typescript
     * // Assume we don't have a built-in 'where' stage
     * firestore.pipeline().collection('books')
     *     .rawStage('where', [field('published').lessThan(1900)]) // Custom 'where' stage
     *     .select('title', 'author');
     * ```
     *
     * @param name - The unique name of the raw stage to add.
     * @param params - A list of parameters to configure the raw stage's behavior.
     * @param options - An object of key value pairs that specifies optional parameters for the stage.
     * @returns A new {@link @firebase/firestore/pipelines#Pipeline} object with this stage appended to the stage list.
     */
    rawStage(name: string, params: unknown[], options?: {
        [key: string]: Expression | unknown;
    }): Pipeline_2;
    /**
     * @internal
     * @private
     */
    _toProto(jsonProtoSerializer: JsonProtoSerializer): Pipeline_3;
    private _addStage;
    /**
     * @internal
     * @private
     * @param db
     * @param userDataReader
     * @param userDataWriter
     * @param stages
     * @protected
     */
    protected newPipeline(db: Firestore_2 | undefined, stages: Stage[]): Pipeline_2;
}

declare type Pipeline_3 = firestoreV1ApiClientInterfaces.Pipeline;

/**
 * Options defining Pipeline execution.
 */
export declare interface PipelineExecuteOptions {
    /**
     * Pipeline to be evaluated.
     */
    pipeline: Pipeline_2;
    /**
     * Specify the index mode.
     */
    indexMode?: 'recommended';
    /**
     * An escape hatch to set options not known at SDK build time. These values
     * will be passed directly to the Firestore backend and not used by the SDK.
     *
     * The option name will be used as provided. And must match the name
     * format used by the backend (hint: use a snake_case_name).
     *
     * Custom option values can be any type supported
     * by Firestore (for example: string, boolean, number, map, …). Value types
     * not known to the SDK will be rejected.
     *
     * Values specified in rawOptions will take precedence over any options
     * with the same name set by the SDK.
     *
     * @example
     * Override the `example_option`:
     * ```
     *   execute({
     *     pipeline: myPipeline,
     *     rawOptions: {
     *       // Override `example_option`. This will not
     *       // merge with the existing `example_option` object.
     *       "example_option": {
     *         foo: "bar"
     *       }
     *     }
     *   }
     * ```
     *
     * `rawOptions` supports dot notation, if you want to override
     * a nested option.
     * ```
     *   execute({
     *     pipeline: myPipeline,
     *     rawOptions: {
     *       // Override `example_option.foo` and do not override
     *       // any other properties of `example_option`.
     *       "example_option.foo": "bar"
     *     }
     *   }
     * ```
     */
    rawOptions?: {
        [name: string]: unknown;
    };
}

declare type PipelineFlavor = 'exact' | 'augmented' | 'keyless';

/**
 *
 * A PipelineResult contains data read from a Firestore Pipeline. The data can be extracted with the
 * {@link @firebase/firestore/pipelines#PipelineResult.data} or {@link @firebase/firestore/pipelines#PipelineResult.(get:1)} methods.
 *
 * <p>If the PipelineResult represents a non-document result, `ref` will return a undefined
 * value.
 */
export declare class PipelineResult<AppModelType = DocumentData> {
    private readonly _userDataWriter;
    private readonly _createTime;
    private readonly _updateTime;
    readonly _metadata: SnapshotMetadata | undefined;
    readonly _listenOptions: ListenOptions | undefined;
    /**
     * @internal
     * @private
     */
    readonly _ref: DocumentReference | undefined;
    /**
     * @internal
     * @private
     */
    readonly _fields: ObjectValue;
    /**
     * @private
     * @internal
     *
     * @param userDataWriter - The serializer used to encode/decode protobuf.
     * @param fields - The fields of the Firestore `Document` Protobuf backing
     * this document.
     * @param ref - The reference to the document.
     * @param createTime - The time when the document was created if the result is a document, undefined otherwise.
     * @param updateTime - The time when the document was last updated if the result is a document, undefined otherwise.
     * @param metadata
     * @param listenOptions
     */
    constructor(userDataWriter: AbstractUserDataWriter, fields: ObjectValue, ref?: DocumentReference, createTime?: Timestamp, updateTime?: Timestamp, metadata?: SnapshotMetadata, listenOptions?: ListenOptions);
    /**
     * @private
     * @internal
     * @param userDataWriter
     * @param doc
     * @param ref
     * @param metadata
     * @param listenOptions
     */
    static fromDocument(userDataWriter: AbstractUserDataWriter, doc: Document_2, ref?: DocumentReference, metadata?: SnapshotMetadata, listenOptions?: ListenOptions): PipelineResult;
    /**
     * The reference of the document, if it is a document; otherwise `undefined`.
     */
    get ref(): DocumentReference | undefined;
    /**
     * The ID of the document for which this PipelineResult contains data, if it is a document; otherwise `undefined`.
     *
     * @readonly
     *
     */
    get id(): string | undefined;
    /**
     * The time the document was created. Undefined if this result is not a document.
     *
     * @readonly
     */
    get createTime(): Timestamp | undefined;
    /**
     * The time the document was last updated (at the time the snapshot was
     * generated). Undefined if this result is not a document.
     *
     * @readonly
     */
    get updateTime(): Timestamp | undefined;
    /**
     * Retrieves all fields in the result as an object.
     *
     * @returns An object containing all fields in the document or
     * 'undefined' if the document doesn't exist.
     *
     * @example
     * ```
     * let p = firestore.pipeline().collection('col');
     *
     * p.execute().then(results => {
     *   let data = results[0].data();
     *   console.log(`Retrieved data: ${JSON.stringify(data)}`);
     * });
     * ```
     */
    data(): AppModelType;
    /**
     * @internal
     * @private
     *
     * Retrieves all fields in the result as a proto value.
     *
     * @returns An `Object` containing all fields in the result.
     */
    _fieldsProto(): {
        [key: string]: firestoreV1ApiClientInterfaces.Value;
    };
    /**
     * Retrieves the field specified by `field`.
     *
     * @param field - The field path
     * (e.g. 'foo' or 'foo.bar') to a specific field.
     * @returns The data at the specified field location or `undefined` if no
     * such field exists.
     *
     * @example
     * ```
     * let p = firestore.pipeline().collection('col');
     *
     * p.execute().then(results => {
     *   let field = results[0].get('a.b');
     *   console.log(`Retrieved field value: ${field}`);
     * });
     * ```
     */
    get(fieldPath: string | FieldPath | Field): any;
}

/**
 * Test equality of two PipelineResults.
 * @param left - First PipelineResult to compare.
 * @param right - Second PipelineResult to compare.
 */
export declare function pipelineResultEqual(left: PipelineResult, right: PipelineResult): boolean;

/**
 * Represents the results of a Firestore pipeline execution.
 *
 * A `PipelineSnapshot` contains zero or more {@link @firebase/firestore/pipelines#PipelineResult} objects
 * representing the documents returned by a pipeline query. It provides methods
 * to iterate over the documents and access metadata about the query results.
 *
 * @example
 * ```typescript
 * const snapshot: PipelineSnapshot = await firestore
 *   .pipeline()
 *   .collection('myCollection')
 *   .where(field('value').greaterThan(10))
 *   .execute();
 *
 * snapshot.results.forEach(doc => {
 *   console.log(doc.id, '=>', doc.data());
 * });
 * ```
 */
export declare class PipelineSnapshot {
    private readonly _pipeline;
    private readonly _executionTime;
    private readonly _results;
    constructor(pipeline: Pipeline_2, results: PipelineResult[], executionTime?: Timestamp);
    /**
     * An array of all the results in the `PipelineSnapshot`.
     */
    get results(): PipelineResult[];
    /**
     * The time at which the pipeline producing this result is executed.
     *
     * @readonly
     *
     */
    get executionTime(): Timestamp;
}

/**
 * Provides the entry point for defining the data source of a Firestore {@link @firebase/firestore/pipelines#Pipeline}.
 *
 * Use the methods of this class (e.g., {@link @firebase/firestore/pipelines#PipelineSource.(collection:1)}, {@link @firebase/firestore/pipelines#PipelineSource.(collectionGroup:1)},
 * {@link @firebase/firestore/pipelines#PipelineSource.(database:1)}, or {@link @firebase/firestore/pipelines#PipelineSource.(documents:1)}) to specify the initial data
 * for your pipeline, such as a collection, a collection group, the entire database, or a set of specific documents.
 */
export declare class PipelineSource<PipelineType> {
    private databaseId;
    private userDataReader;
    /**
     * @internal
     * @private
     */
    _createPipeline: (stages: Stage[]) => PipelineType;
    /**
     * @internal
     * @private
     * @param databaseId
     * @param userDataReader
     * @param _createPipeline
     */
    constructor(databaseId: DatabaseId, userDataReader: UserDataReader, 
    /**
     * @internal
     * @private
     */
    _createPipeline: (stages: Stage[]) => PipelineType);
    /**
     * Returns all documents from the entire collection. The collection can be nested.
     * @param collection - Name or reference to the collection that will be used as the Pipeline source.
     */
    collection(collection: string | CollectionReference): PipelineType;
    /**
     * Returns all documents from the entire collection. The collection can be nested.
     * @param options - Options defining how this CollectionStage is evaluated.
     */
    collection(options: CollectionStageOptions): PipelineType;
    /**
     * Returns all documents from a collection ID regardless of the parent.
     * @param collectionId - ID of the collection group to use as the Pipeline source.
     */
    collectionGroup(collectionId: string): PipelineType;
    /**
     * Returns all documents from a collection ID regardless of the parent.
     * @param options - Options defining how this CollectionGroupStage is evaluated.
     */
    collectionGroup(options: CollectionGroupStageOptions): PipelineType;
    /**
     * Returns all documents from the entire database.
     */
    database(): PipelineType;
    /**
     * Returns all documents from the entire database.
     * @param options - Options defining how a DatabaseStage is evaluated.
     */
    database(options: DatabaseStageOptions): PipelineType;
    /**
     * Set the pipeline's source to the documents specified by the given paths and DocumentReferences.
     *
     * @param docs - An array of paths and DocumentReferences specifying the individual documents that will be the source of this pipeline.
     * The converters for these DocumentReferences will be ignored and not have an effect on this pipeline.
     *
     * @throws `FirestoreError` Thrown if any of the provided DocumentReferences target a different project or database than the pipeline.
     */
    documents(docs: Array<string | DocumentReference>): PipelineType;
    /**
     * Set the pipeline's source to the documents specified by the given paths and DocumentReferences.
     *
     * @param options - Options defining how this DocumentsStage is evaluated.
     *
     * @throws `FirestoreError` Thrown if any of the provided DocumentReferences target a different project or database than the pipeline.
     */
    documents(options: DocumentsStageOptions): PipelineType;
    /**
     * Convert the given Query into an equivalent Pipeline.
     *
     * @param query - A Query to be converted into a Pipeline.
     *
     * @throws `FirestoreError` Thrown if any of the provided DocumentReferences target a different project or database than the pipeline.
     */
    createFrom(query: Query): PipelineType;
    _validateReference(reference: CollectionReference | DocumentReference): void;
}

declare type PipelineSourceType = 'collection' | 'collection_group' | 'database' | 'documents';

/**
 * Creates an expression that returns the value of the base expression raised to the power of the exponent expression.
 *
 * @example
 * ```typescript
 * // Raise the value of the 'base' field to the power of the 'exponent' field.
 * pow(field("base"), field("exponent"));
 * ```
 *
 * @param base - The expression to raise to the power of the exponent.
 * @param exponent - The expression to raise the base to the power of.
 * @returns A new `Expression` representing the power operation.
 */
export declare function pow(base: Expression, exponent: Expression): FunctionExpression;

/**
 * Creates an expression that returns the value of the base expression raised to the power of the exponent.
 *
 * @example
 * ```typescript
 * // Raise the value of the 'base' field to the power of 2.
 * pow(field("base"), 2);
 * ```
 *
 * @param base - The expression to raise to the power of the exponent.
 * @param exponent - The constant value to raise the base to the power of.
 * @returns A new `Expression` representing the power operation.
 */
export declare function pow(base: Expression, exponent: number): FunctionExpression;

/**
 * Creates an expression that returns the value of the base field raised to the power of the exponent expression.
 *
 * @example
 * ```typescript
 * // Raise the value of the 'base' field to the power of the 'exponent' field.
 * pow("base", field("exponent"));
 * ```
 *
 * @param base - The name of the field to raise to the power of the exponent.
 * @param exponent - The expression to raise the base to the power of.
 * @returns A new `Expression` representing the power operation.
 */
export declare function pow(base: string, exponent: Expression): FunctionExpression;

/**
 * Creates an expression that returns the value of the base field raised to the power of the exponent.
 *
 * @example
 * ```typescript
 * // Raise the value of the 'base' field to the power of 2.
 * pow("base", 2);
 * ```
 *
 * @param base - The name of the field to raise to the power of the exponent.
 * @param exponent - The constant value to raise the base to the power of.
 * @returns A new `Expression` representing the power operation.
 */
export declare function pow(base: string, exponent: number): FunctionExpression;

/**
 * Encodes a precondition for a mutation. This follows the model that the
 * backend accepts with the special case of an explicit "empty" precondition
 * (meaning no precondition).
 */
declare class Precondition {
    readonly updateTime?: SnapshotVersion | undefined;
    readonly exists?: boolean | undefined;
    private constructor();
    /** Creates a new empty Precondition. */
    static none(): Precondition;
    /** Creates a new Precondition with an exists flag. */
    static exists(exists: boolean): Precondition;
    /** Creates a new Precondition based on a version a document exists at. */
    static updateTime(version: SnapshotVersion): Precondition;
    /** Returns whether this Precondition is empty. */
    get isNone(): boolean;
    isEqual(other: Precondition): boolean;
}

/**
 * These types primarily exist to support the `UpdateData`,
 * `WithFieldValue`, and `PartialWithFieldValue` types and are not consumed
 * directly by the end developer.
 */
/** Primitive types. */
export declare type Primitive = string | number | boolean | undefined | null;

/**
 * @internal
 * Undocumented, private additional settings not exposed in our public API.
 */
declare interface PrivateSettings extends FirestoreSettings {
    credentials?: CredentialsSettings;
    cacheSizeBytes?: number;
    experimentalForceLongPolling?: boolean;
    experimentalAutoDetectLongPolling?: boolean;
    experimentalLongPollingOptions?: ExperimentalLongPollingOptions;
    useFetchStreams?: boolean;
    emulatorOptions?: {
        mockUserToken?: EmulatorMockTokenOptions | string;
    };
    localCache?: FirestoreLocalCache;
}

/**
 * The representation of a JSON object property name and its type value.
 * @private
 * @internal
 */
declare interface Property<T extends JsonTypeDesc> {
    value?: TSType<T>;
    typeString: JsonTypeDesc;
}

declare interface ProtoSerializable<ProtoType> {
    _toProto(serializer: JsonProtoSerializer): ProtoType;
}

declare interface ProtoValueSerializable extends ProtoSerializable<Value> {
    _protoValueType: 'ProtoValue';
}

declare interface ProviderCredentialsSettings {
    ['type']: 'provider';
    ['client']: CredentialsProvider<User>;
}

/**
 * A `Query` refers to a query which you can read or listen to. You can also
 * construct refined `Query` objects by adding filters and ordering.
 */
export declare class Query<AppModelType = DocumentData, DbModelType extends DocumentData = DocumentData> {
    /**
     * If provided, the `FirestoreDataConverter` associated with this instance.
     */
    readonly converter: FirestoreDataConverter_2<AppModelType, DbModelType> | null;
    readonly _query: Query_2;
    /** The type of this Firestore reference. */
    readonly type: 'query' | 'collection';
    /**
     * The `Firestore` instance for the Firestore database (useful for performing
     * transactions, etc.).
     */
    readonly firestore: Firestore_2;
    /** @hideconstructor protected */
    constructor(firestore: Firestore_2, 
    /**
     * If provided, the `FirestoreDataConverter` associated with this instance.
     */
    converter: FirestoreDataConverter_2<AppModelType, DbModelType> | null, _query: Query_2);
    /**
     * Removes the current converter.
     *
     * @param converter - `null` removes the current converter.
     * @returns A `Query<DocumentData, DocumentData>` that does not use a
     * converter.
     */
    withConverter(converter: null): Query<DocumentData, DocumentData>;
    /**
     * Applies a custom data converter to this query, allowing you to use your own
     * custom model objects with Firestore. When you call {@link getDocs} with
     * the returned query, the provided converter will convert between Firestore
     * data of type `NewDbModelType` and your custom type `NewAppModelType`.
     *
     * @param converter - Converts objects to and from Firestore.
     * @returns A `Query` that uses the provided converter.
     */
    withConverter<NewAppModelType, NewDbModelType extends DocumentData = DocumentData>(converter: FirestoreDataConverter_2<NewAppModelType, NewDbModelType>): Query<NewAppModelType, NewDbModelType>;
}

/**
 * The Query interface defines all external properties of a query.
 *
 * QueryImpl implements this interface to provide memoization for `queryNormalizedOrderBy`
 * and `queryToTarget`.
 */
declare interface Query_2 {
    readonly path: ResourcePath;
    readonly collectionGroup: string | null;
    readonly explicitOrderBy: OrderBy[];
    readonly filters: Filter[];
    readonly limit: number | null;
    readonly limitType: LimitType;
    readonly startAt: Bound | null;
    readonly endAt: Bound | null;
}

/**
 * @license
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * A tracker to keep a record of important details during database local query
 * execution.
 */
declare class QueryContext {
    /**
     * Counts the number of documents passed through during local query execution.
     */
    private _documentReadCount;
    get documentReadCount(): number;
    incrementDocumentReadCount(amount: number): void;
}

/**
 * A `QueryDocumentSnapshot` contains data read from a document in your
 * Firestore database as part of a query. The document is guaranteed to exist
 * and its data can be extracted with `.data()` or `.get(<field>)` to get a
 * specific field.
 *
 * A `QueryDocumentSnapshot` offers the same API surface as a
 * `DocumentSnapshot`. Since query results contain only existing documents, the
 * `exists` property will always be true and `data()` will never return
 * 'undefined'.
 */
export declare class QueryDocumentSnapshot<AppModelType = DocumentData, DbModelType extends DocumentData = DocumentData> extends DocumentSnapshot_2<AppModelType, DbModelType> {
    /**
     * Retrieves all fields in the document as an `Object`.
     *
     * By default, `serverTimestamp()` values that have not yet been
     * set to their final value will be returned as `null`. You can override
     * this by passing an options object.
     *
     * @override
     * @param options - An options object to configure how data is retrieved from
     * the snapshot (for example the desired behavior for server timestamps that
     * have not yet been set to their final value).
     * @returns An `Object` containing all fields in the document.
     */
    data(options?: SnapshotOptions): AppModelType;
}

/**
 * A `QueryDocumentSnapshot` contains data read from a document in your
 * Firestore database as part of a query. The document is guaranteed to exist
 * and its data can be extracted with `.data()` or `.get(<field>)` to get a
 * specific field.
 *
 * A `QueryDocumentSnapshot` offers the same API surface as a
 * `DocumentSnapshot`. Since query results contain only existing documents, the
 * `exists` property will always be true and `data()` will never return
 * 'undefined'.
 */
declare class QueryDocumentSnapshot_2<AppModelType = DocumentData, DbModelType extends DocumentData = DocumentData> extends DocumentSnapshot<AppModelType, DbModelType> {
    /**
     * Retrieves all fields in the document as an `Object`.
     *
     * @override
     * @returns An `Object` containing all fields in the document.
     */
    data(): AppModelType;
}

declare type QueryOrPipeline = Query_2 | CorePipeline;

/** The different states of a watch target. */
declare type QueryTargetState = 'not-current' | 'current' | 'rejected';

/**
 *
 * Creates an expression that generates a random number between 0.0 and 1.0 but not including 1.0.
 *
 * @example
 * ```typescript
 * // Generate a random number between 0.0 and 1.0.
 * rand();
 * ```
 *
 * @returns A new `Expression` representing the rand operation.
 */
export declare function rand(): FunctionExpression;

/**
 * A ReferenceDelegate instance handles all of the hooks into the document-reference lifecycle. This
 * includes being added to a target, being removed from a target, being subject to mutation, and
 * being mutated by the user.
 *
 * Different implementations may do different things with each of these events. Not every
 * implementation needs to do something with every lifecycle hook.
 *
 * PORTING NOTE: since sequence numbers are attached to transactions in this
 * client, the ReferenceDelegate does not need to deal in transactional
 * semantics (onTransactionStarted/Committed()), nor does it need to track and
 * generate sequence numbers (getCurrentSequenceNumber()).
 */
declare interface ReferenceDelegate {
    /** Notify the delegate that the given document was added to a target. */
    addReference(txn: PersistenceTransaction, targetId: TargetId, doc: DocumentKey): PersistencePromise<void>;
    /** Notify the delegate that the given document was removed from a target. */
    removeReference(txn: PersistenceTransaction, targetId: TargetId, doc: DocumentKey): PersistencePromise<void>;
    /**
     * Notify the delegate that a target was removed. The delegate may, but is not obligated to,
     * actually delete the target and associated data.
     */
    removeTarget(txn: PersistenceTransaction, targetData: TargetData): PersistencePromise<void>;
    /**
     * Notify the delegate that a document may no longer be part of any views or
     * have any mutations associated.
     */
    markPotentiallyOrphaned(txn: PersistenceTransaction, doc: DocumentKey): PersistencePromise<void>;
    /** Notify the delegate that a limbo document was updated. */
    updateLimboDocument(txn: PersistenceTransaction, doc: DocumentKey): PersistencePromise<void>;
}

/**
 *
 * Creates an expression that checks if a string field contains a specified regular expression as
 * a substring.
 *
 * @example
 * ```typescript
 * // Check if the 'description' field contains "example" (case-insensitive)
 * regexContains("description", "(?i)example");
 * ```
 *
 * @param fieldName - The name of the field containing the string.
 * @param pattern - The regular expression to use for the search.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'contains' comparison.
 */
export declare function regexContains(fieldName: string, pattern: string): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string field contains a specified regular expression as
 * a substring.
 *
 * @example
 * ```typescript
 * // Check if the 'description' field contains "example" (case-insensitive)
 * regexContains("description", field("pattern"));
 * ```
 *
 * @param fieldName - The name of the field containing the string.
 * @param pattern - The regular expression to use for the search.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'contains' comparison.
 */
export declare function regexContains(fieldName: string, pattern: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string expression contains a specified regular
 * expression as a substring.
 *
 * @example
 * ```typescript
 * // Check if the 'description' field contains "example" (case-insensitive)
 * regexContains(field("description"), "(?i)example");
 * ```
 *
 * @param stringExpression - The expression representing the string to perform the comparison on.
 * @param pattern - The regular expression to use for the search.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'contains' comparison.
 */
export declare function regexContains(stringExpression: Expression, pattern: string): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string expression contains a specified regular
 * expression as a substring.
 *
 * @example
 * ```typescript
 * // Check if the 'description' field contains "example" (case-insensitive)
 * regexContains(field("description"), field("pattern"));
 * ```
 *
 * @param stringExpression - The expression representing the string to perform the comparison on.
 * @param pattern - The regular expression to use for the search.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'contains' comparison.
 */
export declare function regexContains(stringExpression: Expression, pattern: Expression): BooleanExpression;

/**
 *
 * Creates an expression that returns the first substring of a string field that matches a
 * specified regular expression.
 *
 * This expression uses the {@link https://github.com/google/re2/wiki/Syntax | RE2} regular expression syntax.
 *
 * @example
 * ```typescript
 * // Extract the domain name from an email field
 * regexFind("email", "@[A-Za-z0-9.-]+");
 * ```
 *
 * @param fieldName - The name of the field containing the string to search.
 * @param pattern - The regular expression to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the regular expression find function.
 */
export declare function regexFind(fieldName: string, pattern: string): FunctionExpression;

/**
 *
 * Creates an expression that returns the first substring of a string field that matches a
 * specified regular expression.
 *
 * This expression uses the {@link https://github.com/google/re2/wiki/Syntax | RE2} regular expression syntax.
 *
 * @example
 * ```typescript
 * // Extract a substring from 'email' based on a pattern stored in another field
 * regexFind("email", field("pattern"));
 * ```
 *
 * @param fieldName - The name of the field containing the string to search.
 * @param pattern - The regular expression to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the regular expression find function.
 */
export declare function regexFind(fieldName: string, pattern: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns the first substring of a string expression that matches
 * a specified regular expression.
 *
 * This expression uses the {@link https://github.com/google/re2/wiki/Syntax | RE2} regular expression syntax.
 *
 * @example
 * ```typescript
 * // Extract the domain from a lower-cased email address
 * regexFind(field("email"), "@[A-Za-z0-9.-]+");
 * ```
 *
 * @param stringExpression - The expression representing the string to search.
 * @param pattern - The regular expression to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the regular expression find function.
 */
export declare function regexFind(stringExpression: Expression, pattern: string): FunctionExpression;

/**
 *
 * Creates an expression that returns the first substring of a string expression that matches
 * a specified regular expression.
 *
 * This expression uses the {@link https://github.com/google/re2/wiki/Syntax | RE2} regular expression syntax.
 *
 * @example
 * ```typescript
 * // Extract a substring based on a dynamic pattern field
 * regexFind(field("email"), field("pattern"));
 * ```
 *
 * @param stringExpression - The expression representing the string to search.
 * @param pattern - The regular expression to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the regular expression find function.
 */
export declare function regexFind(stringExpression: Expression, pattern: Expression): FunctionExpression;

/**
 *
 * Creates an expression that evaluates to a list of all substrings in a string field that
 * match a specified regular expression.
 *
 * This expression uses the {@link https://github.com/google/re2/wiki/Syntax | RE2} regular expression syntax.
 *
 * @example
 * ```typescript
 * // Extract all hashtags from a post content field
 * regexFindAll("content", "#[A-Za-z0-9_]+");
 * ```
 *
 * @param fieldName - The name of the field containing the string to search.
 * @param pattern - The regular expression to search for.
 * @returns A new {@link @firebase/firestore/pipelines#FunctionExpression} that evaluates to an array of matched substrings.
 */
export declare function regexFindAll(fieldName: string, pattern: string): FunctionExpression;

/**
 *
 * Creates an expression that evaluates to a list of all substrings in a string field that
 * match a specified regular expression.
 *
 * This expression uses the {@link https://github.com/google/re2/wiki/Syntax | RE2} regular expression syntax.
 *
 * @example
 * ```typescript
 * // Extract all matches from 'content' based on a pattern stored in another field
 * regexFindAll("content", field("pattern"));
 * ```
 *
 * @param fieldName - The name of the field containing the string to search.
 * @param pattern - The regular expression to search for.
 * @returns A new {@link @firebase/firestore/pipelines#FunctionExpression} that evaluates to an array of matched substrings.
 */
export declare function regexFindAll(fieldName: string, pattern: Expression): FunctionExpression;

/**
 *
 * Creates an expression that evaluates to a list of all substrings in a string expression
 * that match a specified regular expression.
 *
 * This expression uses the {@link https://github.com/google/re2/wiki/Syntax | RE2} regular expression syntax.
 *
 * @example
 * ```typescript
 * // Extract all mentions from a lower-cased comment
 * regexFindAll(field("comment"), "@[A-Za-z0-9_]+");
 * ```
 *
 * @param stringExpression - The expression representing the string to search.
 * @param pattern - The regular expression to search for.
 * @returns A new {@link @firebase/firestore/pipelines#FunctionExpression} that evaluates to an array of matched substrings.
 */
export declare function regexFindAll(stringExpression: Expression, pattern: string): FunctionExpression;

/**
 *
 * Creates an expression that evaluates to a list of all substrings in a string expression
 * that match a specified regular expression.
 *
 * This expression uses the {@link https://github.com/google/re2/wiki/Syntax | RE2} regular expression syntax.
 *
 * @example
 * ```typescript
 * // Extract all matches based on a dynamic pattern expression
 * regexFindAll(field("comment"), field("pattern"));
 * ```
 *
 * @param stringExpression - The expression representing the string to search.
 * @param pattern - The regular expression to search for.
 * @returns A new {@link @firebase/firestore/pipelines#FunctionExpression} that evaluates to an array of matched substrings.
 */
export declare function regexFindAll(stringExpression: Expression, pattern: Expression): FunctionExpression;

/**
 *
 * Creates an expression that checks if a string field matches a specified regular expression.
 *
 * @example
 * ```typescript
 * // Check if the 'email' field matches a valid email pattern
 * regexMatch("email", "[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}");
 * ```
 *
 * @param fieldName - The name of the field containing the string.
 * @param pattern - The regular expression to use for the match.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the regular expression match.
 */
export declare function regexMatch(fieldName: string, pattern: string): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string field matches a specified regular expression.
 *
 * @example
 * ```typescript
 * // Check if the 'email' field matches a valid email pattern
 * regexMatch("email", field("pattern"));
 * ```
 *
 * @param fieldName - The name of the field containing the string.
 * @param pattern - The regular expression to use for the match.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the regular expression match.
 */
export declare function regexMatch(fieldName: string, pattern: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string expression matches a specified regular
 * expression.
 *
 * @example
 * ```typescript
 * // Check if the 'email' field matches a valid email pattern
 * regexMatch(field("email"), "[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}");
 * ```
 *
 * @param stringExpression - The expression representing the string to match against.
 * @param pattern - The regular expression to use for the match.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the regular expression match.
 */
export declare function regexMatch(stringExpression: Expression, pattern: string): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string expression matches a specified regular
 * expression.
 *
 * @example
 * ```typescript
 * // Check if the 'email' field matches a valid email pattern
 * regexMatch(field("email"), field("pattern"));
 * ```
 *
 * @param stringExpression - The expression representing the string to match against.
 * @param pattern - The regular expression to use for the match.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the regular expression match.
 */
export declare function regexMatch(stringExpression: Expression, pattern: Expression): BooleanExpression;

declare type RejectedHandler<R> = ((reason: Error) => R | PersistencePromise<R>) | null;

declare type Rejector = (error: Error) => void;

/**
 * Represents cached documents received from the remote backend.
 *
 * The cache is keyed by DocumentKey and entries in the cache are
 * MutableDocuments, meaning we can cache both actual documents as well as
 * documents that are known to not exist.
 */
declare interface RemoteDocumentCache {
    /** Sets the index manager to use for managing the collectionGroup index. */
    setIndexManager(indexManager: IndexManager): void;
    /**
     * Looks up an entry in the cache.
     *
     * @param documentKey - The key of the entry to look up.*
     * @returns The cached document entry. Returns an invalid document if the
     * document is not cached.
     */
    getEntry(transaction: PersistenceTransaction, documentKey: DocumentKey): PersistencePromise<MutableDocument>;
    /**
     * Looks up a set of entries in the cache.
     *
     * @param documentKeys - The keys of the entries to look up.
     * @returns The cached document entries indexed by key. If an entry is not
     * cached, the corresponding key will be mapped to an invalid document.
     */
    getEntries(transaction: PersistenceTransaction, documentKeys: DocumentKeySet): PersistencePromise<MutableDocumentMap>;
    getAllEntries(transaction: PersistenceTransaction): PersistencePromise<MutableDocumentMap>;
    /**
     * Returns the documents matching the given query
     *
     * @param query - The query to match documents against.
     * @param offset - The offset to start the scan at (exclusive).
     * @param context - A optional tracker to keep a record of important details
     *   during database local query execution.
     * @returns The set of matching documents.
     */
    getDocumentsMatchingQuery(transaction: PersistenceTransaction, query: QueryOrPipeline, offset: IndexOffset, mutatedDocs: OverlayMap, context?: QueryContext): PersistencePromise<MutableDocumentMap>;
    /**
     * Looks up the next `limit` documents for a collection group based on the
     * provided offset. The ordering is based on the document's read time and key.
     *
     * @param collectionGroup - The collection group to scan.
     * @param offset - The offset to start the scan at (exclusive).
     * @param limit - The maximum number of results to return.
     * @returns The set of matching documents.
     */
    getAllFromCollectionGroup(transaction: PersistenceTransaction, collectionGroup: string, offset: IndexOffset, limit: number): PersistencePromise<MutableDocumentMap>;
    /**
     * Provides access to add or update the contents of the cache. The buffer
     * handles proper size accounting for the change.
     *
     * Multi-Tab Note: This should only be called by the primary client.
     *
     * @param options - Specify `trackRemovals` to create sentinel entries for
     * removed documents, which allows removals to be tracked by
     * `getNewDocumentChanges()`.
     */
    newChangeBuffer(options?: {
        trackRemovals: boolean;
    }): RemoteDocumentChangeBuffer;
    /**
     * Get an estimate of the size of the document cache. Note that for eager
     * garbage collection, we don't track sizes so this will return 0.
     */
    getSize(transaction: PersistenceTransaction): PersistencePromise<number>;
}

/**
 * An in-memory buffer of entries to be written to a RemoteDocumentCache.
 * It can be used to batch up a set of changes to be written to the cache, but
 * additionally supports reading entries back with the `getEntry()` method,
 * falling back to the underlying RemoteDocumentCache if no entry is
 * buffered.
 *
 * Entries added to the cache *must* be read first. This is to facilitate
 * calculating the size delta of the pending changes.
 *
 * PORTING NOTE: This class was implemented then removed from other platforms.
 * If byte-counting ends up being needed on the other platforms, consider
 * porting this class as part of that implementation work.
 */
declare abstract class RemoteDocumentChangeBuffer {
    protected changes: ObjectMap<DocumentKey, MutableDocument>;
    private changesApplied;
    protected abstract getFromCache(transaction: PersistenceTransaction, documentKey: DocumentKey): PersistencePromise<MutableDocument>;
    protected abstract getAllFromCache(transaction: PersistenceTransaction, documentKeys: DocumentKeySet): PersistencePromise<MutableDocumentMap>;
    protected abstract applyChanges(transaction: PersistenceTransaction): PersistencePromise<void>;
    /**
     * Buffers a `RemoteDocumentCache.addEntry()` call.
     *
     * You can only modify documents that have already been retrieved via
     * `getEntry()/getEntries()` (enforced via IndexedDbs `apply()`).
     */
    addEntry(document: MutableDocument): void;
    /**
     * Buffers a `RemoteDocumentCache.removeEntry()` call.
     *
     * You can only remove documents that have already been retrieved via
     * `getEntry()/getEntries()` (enforced via IndexedDbs `apply()`).
     */
    removeEntry(key: DocumentKey, readTime: SnapshotVersion): void;
    /**
     * Looks up an entry in the cache. The buffered changes will first be checked,
     * and if no buffered change applies, this will forward to
     * `RemoteDocumentCache.getEntry()`.
     *
     * @param transaction - The transaction in which to perform any persistence
     *     operations.
     * @param documentKey - The key of the entry to look up.
     * @returns The cached document or an invalid document if we have nothing
     * cached.
     */
    getEntry(transaction: PersistenceTransaction, documentKey: DocumentKey): PersistencePromise<MutableDocument>;
    /**
     * Looks up several entries in the cache, forwarding to
     * `RemoteDocumentCache.getEntry()`.
     *
     * @param transaction - The transaction in which to perform any persistence
     *     operations.
     * @param documentKeys - The keys of the entries to look up.
     * @returns A map of cached documents, indexed by key. If an entry cannot be
     *     found, the corresponding key will be mapped to an invalid document.
     */
    getEntries(transaction: PersistenceTransaction, documentKeys: DocumentKeySet): PersistencePromise<MutableDocumentMap>;
    /**
     * Applies buffered changes to the underlying RemoteDocumentCache, using
     * the provided transaction.
     */
    apply(transaction: PersistenceTransaction): PersistencePromise<void>;
    /** Helper to assert this.changes is not null  */
    protected assertNotApplied(): void;
}

/**
 * An event from the RemoteStore. It is split into targetChanges (changes to the
 * state or the set of documents in our watched targets) and documentUpdates
 * (changes to the actual documents).
 */
declare class RemoteEvent<T extends TargetId | RemoteTargetId = TargetId> {
    /**
     * The snapshot version this event brings us up to, or MIN if not set.
     */
    readonly snapshotVersion: SnapshotVersion;
    /**
     * A map from target to changes to the target. See TargetChange.
     */
    readonly targetChanges: Map<T, TargetChange>;
    /**
     * A map of targets that is known to be inconsistent, and the purpose for
     * re-listening. Listens for these targets should be re-established without
     * resume tokens.
     */
    readonly targetMismatches: SortedMap<T, TargetPurpose>;
    /**
     * A set of which documents have changed or been deleted, along with the
     * doc's new values (if not deleted).
     */
    readonly documentUpdates: MutableDocumentMap;
    /**
     * A set of which augmented documents (pipeline) have changed or been deleted, along with the
     * doc's new values (if not deleted).
     */
    readonly augmentedDocumentUpdates: MutableDocumentMap;
    /**
     * A set of which document updates are due only to limbo resolution targets.
     */
    readonly resolvedLimboDocuments: DocumentKeySet;
    constructor(
    /**
     * The snapshot version this event brings us up to, or MIN if not set.
     */
    snapshotVersion: SnapshotVersion, 
    /**
     * A map from target to changes to the target. See TargetChange.
     */
    targetChanges: Map<T, TargetChange>, 
    /**
     * A map of targets that is known to be inconsistent, and the purpose for
     * re-listening. Listens for these targets should be re-established without
     * resume tokens.
     */
    targetMismatches: SortedMap<T, TargetPurpose>, 
    /**
     * A set of which documents have changed or been deleted, along with the
     * doc's new values (if not deleted).
     */
    documentUpdates: MutableDocumentMap, 
    /**
     * A set of which augmented documents (pipeline) have changed or been deleted, along with the
     * doc's new values (if not deleted).
     */
    augmentedDocumentUpdates: MutableDocumentMap, 
    /**
     * A set of which document updates are due only to limbo resolution targets.
     */
    resolvedLimboDocuments: DocumentKeySet);
    /**
     * HACK: Views require RemoteEvents in order to determine whether the view is
     * CURRENT, but secondary tabs don't receive remote events. So this method is
     * used to create a synthesized RemoteEvent that can be used to apply a
     * CURRENT status change to a View, for queries executed in a different tab.
     */
    static createSynthesizedRemoteEventForCurrentChange(targetId: TargetId, current: boolean, resumeToken: ByteString): RemoteEvent<TargetId>;
}

/**
 * RemoteStore - An interface to remotely stored data, basically providing a
 * wrapper around the Datastore that is more reliable for the rest of the
 * system.
 *
 * RemoteStore is responsible for maintaining the connection to the server.
 * - maintaining a list of active listens.
 * - reconnecting when the connection is dropped.
 * - resuming all the active listens on reconnect.
 *
 * RemoteStore handles all incoming events from the Datastore.
 * - listening to the watch stream and repackaging the events as RemoteEvents
 * - notifying SyncEngine of any changes to the active listens.
 *
 * RemoteStore takes writes from other components and handles them reliably.
 * - pulling pending mutations from LocalStore and sending them to Datastore.
 * - retrying mutations that failed because of network problems.
 * - acking mutations to the SyncEngine once they are accepted or rejected.
 */
declare interface RemoteStore {
    /**
     * SyncEngine to notify of watch and write events. This must be set
     * immediately after construction.
     */
    remoteSyncer: RemoteSyncer;
}

/**
 * An interface that describes the actions the RemoteStore needs to perform on
 * a cooperating synchronization engine.
 */
declare interface RemoteSyncer {
    /**
     * Applies one remote event to the sync engine, notifying any views of the
     * changes, and releasing any pending mutation batches that would become
     * visible because of the snapshot version the remote event contains.
     */
    applyRemoteEvent?(remoteEvent: RemoteEvent): Promise<void>;
    /**
     * Rejects the listen for the given targetID. This can be triggered by the
     * backend for any active target.
     *
     * @param targetId - The targetID corresponds to one previously initiated by
     * the user as part of TargetData passed to listen() on RemoteStore.
     * @param error - A description of the condition that has forced the rejection.
     * Nearly always this will be an indication that the user is no longer
     * authorized to see the data matching the target.
     */
    rejectListen?(targetId: TargetId, error: FirestoreError): Promise<void>;
    /**
     * Applies the result of a successful write of a mutation batch to the sync
     * engine, emitting snapshots in any views that the mutation applies to, and
     * removing the batch from the mutation queue.
     */
    applySuccessfulWrite?(result: MutationBatchResult): Promise<void>;
    /**
     * Rejects the batch, removing the batch from the mutation queue, recomputing
     * the local view of any documents affected by the batch and then, emitting
     * snapshots with the reverted value.
     */
    rejectFailedWrite?(batchId: BatchId, error: FirestoreError): Promise<void>;
    /**
     * Returns the set of remote document keys for the given target ID. This list
     * includes the documents that were assigned to the target when we received
     * the last snapshot.
     */
    getRemoteKeysForTarget?(targetId: TargetId): DocumentKeySet;
    /**
     * Updates all local state to match the pending mutations for the given user.
     * May be called repeatedly for the same user.
     */
    handleCredentialChange?(user: User): Promise<void>;
}

/**
 * A locally-assigned ID used to refer to a target being watched via the
 * Watch service.
 */
declare type RemoteTargetId = number & {
    readonly __brand?: 'remote';
};

/**
 * Options defining how a RemoveFieldsStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(removeFields:1)}.
 */
export declare type RemoveFieldsStageOptions = StageOptions & {
    /**
     * The fields to remove from each document.
     */
    fields: Array<Field | string>;
};

/**
 * Options defining how a ReplaceWithStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(replaceWith:1)}.
 */
export declare type ReplaceWithStageOptions = StageOptions & {
    /**
     * The name of a field that contains a map or an {@link @firebase/firestore/pipelines#Expression} that
     * evaluates to a map.
     */
    map: Expression | string;
};

declare type Resolver<T> = (value?: T) => void;

/**
 * A slash-separated path for navigating resources (documents and collections)
 * within Firestore.
 *
 * @internal
 */
declare class ResourcePath extends BasePath<ResourcePath> {
    protected construct(segments: string[], offset?: number, length?: number): ResourcePath;
    canonicalString(): string;
    toString(): string;
    toStringWithLeadingSlash(): string;
    /**
     * Returns a string representation of this path
     * where each path segment has been encoded with
     * `encodeURIComponent`.
     */
    toUriEncodedString(): string;
    /**
     * Creates a resource path from the given slash-delimited string. If multiple
     * arguments are provided, all components are combined. Leading and trailing
     * slashes from all components are ignored.
     */
    static fromString(...pathComponents: string[]): ResourcePath;
    static emptyPath(): ResourcePath;
}

/**
 *
 * Creates an expression that reverses a string.
 *
 * @example
 * ```typescript
 * // Reverse the value of the 'myString' field.
 * reverse(field("myString"));
 * ```
 *
 * @param stringExpression - An expression evaluating to a string value, which will be reversed.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the reversed string.
 */
export declare function reverse(stringExpression: Expression): FunctionExpression;

/**
 *
 * Creates an expression that reverses a string value in the specified field.
 *
 * @example
 * ```typescript
 * // Reverse the value of the 'myString' field.
 * reverse("myString");
 * ```
 *
 * @param field - The name of the field representing the string to reverse.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the reversed string.
 */
export declare function reverse(field: string): FunctionExpression;

/**
 * Creates an expression that rounds a numeric value to the nearest whole number.
 *
 * @example
 * ```typescript
 * // Round the value of the 'price' field.
 * round("price");
 * ```
 *
 * @param fieldName - The name of the field to round.
 * @returns A new `Expression` representing the rounded value.
 */
export declare function round(fieldName: string): FunctionExpression;

/**
 * Creates an expression that rounds a numeric value to the nearest whole number.
 *
 * @example
 * ```typescript
 * // Round the value of the 'price' field.
 * round(field("price"));
 * ```
 *
 * @param expression - An expression evaluating to a numeric value, which will be rounded.
 * @returns A new `Expression` representing the rounded value.
 */
export declare function round(expression: Expression): FunctionExpression;

/**
 * Creates an expression that rounds a numeric value to the specified number of decimal places.
 *
 * @example
 * ```typescript
 * // Round the value of the 'price' field to two decimal places.
 * round("price", 2);
 * ```
 *
 * @param fieldName - The name of the field to round.
 * @param decimalPlaces - A constant or expression specifying the rounding precision in decimal places.
 * @returns A new `Expression` representing the rounded value.
 */
export declare function round(fieldName: string, decimalPlaces: number | Expression): FunctionExpression;

/**
 * Creates an expression that rounds a numeric value to the specified number of decimal places.
 *
 * @example
 * ```typescript
 * // Round the value of the 'price' field to two decimal places.
 * round(field("price"), constant(2));
 * ```
 *
 * @param expression - An expression evaluating to a numeric value, which will be rounded.
 * @param decimalPlaces - A constant or expression specifying the rounding precision in decimal places.
 * @returns A new `Expression` representing the rounded value.
 */
export declare function round(expression: Expression, decimalPlaces: number | Expression): FunctionExpression;

/**
 * Trims whitespace or a specified set of characters/bytes from the end of a string or byte array.
 *
 * @example
 * ```typescript
 * // Trim whitespace from the end of the 'userInput' field
 * rtrim(field("userInput"));
 *
 * // Trim quotes from the end of the 'userInput' field
 * rtrim(field("userInput"), '"');
 * ```
 *
 * @param fieldName - The name of the field containing the string or byte array.
 * @param valueToTrim - Optional. A string or byte array containing the characters/bytes to trim.
 * If not specified, whitespace will be trimmed.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the trimmed string or byte array.
 */
export declare function rtrim(fieldName: string, valueToTrim?: string | Expression | Bytes): FunctionExpression;

/**
 * Trims whitespace or a specified set of characters/bytes from the end of a string or byte array.
 *
 * @example
 * ```typescript
 * // Trim whitespace from the end of the 'userInput' field
 * rtrim(field("userInput"));
 *
 * // Trim quotes from the end of the 'userInput' field
 * rtrim(field("userInput"), '"');
 * ```
 *
 * @param expression - The expression representing the string or byte array.
 * @param valueToTrim - Optional. A string or byte array containing the characters/bytes to trim.
 * If not specified, whitespace will be trimmed.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the trimmed string or byte array.
 */
export declare function rtrim(expression: Expression, valueToTrim?: string | Expression | Bytes): FunctionExpression;

/**
 * Defines the options for evaluating a sample stage within a pipeline.
 * This type combines common {@link @firebase/firestore/pipelines#StageOptions} with a specific configuration
 * where only one of the defined sampling methods can be applied.
 *
 * See {@link @firebase/firestore/pipelines#Pipeline.(sample:1)} to create a sample stage..
 */
export declare type SampleStageOptions = StageOptions & OneOf<{
    /**
     * If set, specifies the sample rate as a percentage of the
     * input documents.
     *
     * Cannot be set when `documents: number` is set.
     */
    percentage: number;
    /**
     * If set, specifies the sample rate as a total number of
     * documents to sample from the input documents.
     *
     * Cannot be set when `percentage: number` is set.
     */
    documents: number;
}>;

/**
 * Interface to schedule periodic tasks within SDK.
 */
declare interface Scheduler {
    readonly started: boolean;
    start(): void;
    stop(): void;
}

/**
 * @beta
 *
 * Evaluates to the search score that reflects the topicality of the document
 * to all of the text predicates (for example: `documentMatches`)
 * in the search query. If `SearchOptions.query` is not set or does not contain
 * any text predicates, then this topicality score will always be `0`.
 *
 * @example
 * ```typescript
 * db.pipeline().collection('restaurants').search({
 *   query: 'waffles',
 *   sort: score().descending()
 * })
 * ```
 *
 * @remarks This Expression can only be used within a `search` stage.
 */
export declare function score(): Expression;

/**
 * @beta
 * Options defining how a search stage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(search:1)}.
 */
export declare type SearchStageOptions = StageOptions & {
    /**
     * Specifies the search query that will be used to query and score documents
     * by the search stage.
     *
     * The query can be expressed as an `Expression`, which will be used to score
     * and filter the results. Not all expressions supported by Pipelines
     * are supported in the search query.
     *
     * @example
     * ```typescript
     * db.pipeline().collection('restaurants').search({
     *   query: or(
     *     documentMatches("breakfast"),
     *     field('menu').matches('waffle AND coffee')
     *   )
     * })
     * ```
     *
     * The query can also be expressed as a string in the search domain-specific language (DSL), which will be used for searching the document.
     *
     * @example
     * ```typescript
     * db.pipeline().collection('restaurants').search({ query: 'breakfast -diner' });
     *
     * // The above query is equivalent to:
     * db.pipeline().collection('restaurants').search({ query: documentMatches('breakfast -diner') });
     * ```
     *
     * The query can also represent a geoDistance query:
     *
     * @example
     * ```typescript
     * db.pipeline().collection('restaurants').search({
     *   query: field('location').geoDistance(new GeoPoint(0, 0)).lessThanOrEqual(1000)
     * })
     * ```
     */
    query: BooleanExpression | string;
    /**
     * The BCP-47 language code of text in the search query, such as “en” or “sr”.
     */
    languageCode?: string;
    /**
     * The maximum number of documents to retrieve from the search index. Documents will be retrieved in the
     * pre-sort order specified by the search index. The `retrievalDepth` is a limit applied before documents
     * are scored and sorted, which can reduce costs of expensive scoring and sorting operations.
     */
    retrievalDepth?: number;
    /**
     * Orderings specify how the returned documents are sorted.
     * One or more ordering are required.
     */
    sort?: Ordering | Ordering[];
    /**
     * The number of documents to skip from the beginning of the search result set.
     */
    offset?: number;
    /**
     * The maximum number of documents to return from the `search` stage. The `limit` is applied after documents
     * are scored and sorted.
     */
    limit?: number;
    /**
     * The fields to add to each document, specified as a {@link @firebase/firestore/pipelines#Selectable}.
     */
    addFields?: Selectable[];
};

/**
 *
 * An interface that represents a selectable expression.
 */
export declare interface Selectable {
    selectable: true;
    /**
     * @private
     * @internal
     */
    readonly alias: string;
    /**
     * @private
     * @internal
     */
    readonly expr: Expression;
}

/**
 * Options defining how a SelectStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(select:1)}.
 */
export declare type SelectStageOptions = StageOptions & {
    /**
     * The fields to include in the output documents, specified as {@link @firebase/firestore/pipelines#Selectable} expression
     * or as a string value indicating the field name.
     */
    selections: Array<Selectable | string>;
};

/** Base interface for the Serializer implementation. */
declare interface Serializer {
    readonly useProto3Json: boolean;
}

declare type ServerTimestampBehavior = 'estimate' | 'previous' | 'none';

/**
 * An options object that configures the behavior of {@link @firebase/firestore/lite#(setDoc:1)}, {@link
 * @firebase/firestore/lite#(WriteBatch.set:1)} and {@link @firebase/firestore/lite#(Transaction.set:1)} calls. These calls can be
 * configured to perform granular merges instead of overwriting the target
 * documents in their entirety by providing a `SetOptions` with `merge: true`.
 *
 * @param merge - Changes the behavior of a `setDoc()` call to only replace the
 * values specified in its data argument. Fields omitted from the `setDoc()`
 * call remain untouched. If your input sets any field to an empty map, all
 * nested fields are overwritten.
 * @param mergeFields - Changes the behavior of `setDoc()` calls to only replace
 * the specified field paths. Any field path that is not specified is ignored
 * and remains untouched. If your input sets any field to an empty map, all
 * nested fields are overwritten.
 */
export declare type SetOptions = {
    readonly merge?: boolean;
} | {
    readonly mergeFields?: Array<string | FieldPath>;
};

/**
 * A `SharedClientState` keeps track of the global state of the mutations
 * and query targets for all active clients with the same persistence key (i.e.
 * project ID and FirebaseApp name). It relays local changes to other clients
 * and updates its local state as new state is observed.
 *
 * `SharedClientState` is primarily used for synchronization in Multi-Tab
 * environments. Each tab is responsible for registering its active query
 * targets and mutations. `SharedClientState` will then notify the listener
 * assigned to `.syncEngine` for updates to mutations and queries that
 * originated in other clients.
 *
 * To receive notifications, `.syncEngine` and `.onlineStateHandler` has to be
 * assigned before calling `start()`.
 */
declare interface SharedClientState {
    onlineStateHandler: ((onlineState: OnlineState) => void) | null;
    sequenceNumberHandler: ((sequenceNumber: ListenSequenceNumber) => void) | null;
    /** Registers the Mutation Batch ID of a newly pending mutation. */
    addPendingMutation(batchId: BatchId): void;
    /**
     * Records that a pending mutation has been acknowledged or rejected.
     * Called by the primary client to notify secondary clients of mutation
     * results as they come back from the backend.
     */
    updateMutationState(batchId: BatchId, state: 'acknowledged' | 'rejected', error?: FirestoreError): void;
    /**
     * Associates a new Query Target ID with the local Firestore client. Returns
     * the new query state for the query (which can be 'current' if the query is
     * already associated with another tab).
     *
     * If the target id is already associated with local client, the method simply
     * returns its `QueryTargetState`.
     */
    addLocalQueryTarget(targetId: TargetId, addToActiveTargetIds?: boolean): QueryTargetState;
    /** Removes the Query Target ID association from the local client. */
    removeLocalQueryTarget(targetId: TargetId): void;
    /** Checks whether the target is associated with the local client. */
    isLocalQueryTarget(targetId: TargetId): boolean;
    /**
     * Processes an update to a query target.
     *
     * Called by the primary client to notify secondary clients of document
     * changes or state transitions that affect the provided query target.
     */
    updateQueryState(targetId: TargetId, state: QueryTargetState, error?: FirestoreError): void;
    /**
     * Removes the target's metadata entry.
     *
     * Called by the primary client when all clients stopped listening to a query
     * target.
     */
    clearQueryState(targetId: TargetId): void;
    /**
     * Gets the active Query Targets IDs for all active clients.
     *
     * The implementation for this may require O(n) runtime, where 'n' is the size
     * of the result set.
     */
    getAllActiveQueryTargets(): SortedSet<TargetId>;
    /**
     * Checks whether the provided target ID is currently being listened to by
     * any of the active clients.
     *
     * The implementation may require O(n*log m) runtime, where 'n' is the number
     * of clients and 'm' the number of targets.
     */
    isActiveQueryTarget(targetId: TargetId): boolean;
    /**
     * Starts the SharedClientState, reads existing client data and registers
     * listeners for updates to new and existing clients.
     */
    start(): Promise<void>;
    /** Shuts down the `SharedClientState` and its listeners. */
    shutdown(): void;
    /**
     * Changes the active user and removes all existing user-specific data. The
     * user change does not call back into SyncEngine (for example, no mutations
     * will be marked as removed).
     */
    handleUserChange(user: User, removedBatchIds: BatchId[], addedBatchIds: BatchId[]): void;
    /** Changes the shared online state of all clients. */
    setOnlineState(onlineState: OnlineState): void;
    writeSequenceNumber(sequenceNumber: ListenSequenceNumber): void;
    /**
     * Notifies other clients when remote documents have changed due to loading
     * a bundle.
     *
     * @param collectionGroups - The collection groups affected by this bundle.
     */
    notifyBundleLoaded(collectionGroups: Set<string>): void;
}

/**
 * An options object that can be passed to {@link (onSnapshot:1)} and {@link
 * QuerySnapshot.docChanges} to control which types of changes to include in the
 * result set.
 */
export declare interface SnapshotListenOptions {
    /**
     * Include a change even if only the metadata of the query or of a document
     * changed. Default is false.
     */
    readonly includeMetadataChanges?: boolean;
    /**
     * Set the source the query listens to. Default to "default", which
     * listens to both cache and server.
     */
    readonly source?: ListenSource;
}

/**
 * Metadata about a snapshot, describing the state of the snapshot.
 */
export declare class SnapshotMetadata {
    /**
     * True if the snapshot contains the result of local writes (for example
     * `set()` or `update()` calls) that have not yet been committed to the
     * backend. If your listener has opted into metadata updates (via
     * `SnapshotListenOptions`) you will receive another snapshot with
     * `hasPendingWrites` equal to false once the writes have been committed to
     * the backend.
     */
    readonly hasPendingWrites: boolean;
    /**
     * True if the snapshot was created from cached data rather than guaranteed
     * up-to-date server data. If your listener has opted into metadata updates
     * (via `SnapshotListenOptions`) you will receive another snapshot with
     * `fromCache` set to false once the client has received up-to-date data from
     * the backend.
     */
    readonly fromCache: boolean;
    /** @hideconstructor */
    constructor(hasPendingWrites: boolean, fromCache: boolean);
    /**
     * Returns true if this `SnapshotMetadata` is equal to the provided one.
     *
     * @param other - The `SnapshotMetadata` to compare against.
     * @returns true if this `SnapshotMetadata` is equal to the provided one.
     */
    isEqual(other: SnapshotMetadata): boolean;
}

/**
 * Options that configure how data is retrieved from a `DocumentSnapshot` (for
 * example the desired behavior for server timestamps that have not yet been set
 * to their final value).
 */
export declare interface SnapshotOptions {
    /**
     * If set, controls the return value for server timestamps that have not yet
     * been set to their final value.
     *
     * By specifying 'estimate', pending server timestamps return an estimate
     * based on the local clock. This estimate will differ from the final value
     * and cause these values to change once the server result becomes available.
     *
     * By specifying 'previous', pending timestamps will be ignored and return
     * their previous value instead.
     *
     * If omitted or set to 'none', `null` will be returned by default until the
     * server value becomes available.
     */
    readonly serverTimestamps?: 'estimate' | 'previous' | 'none';
}

/**
 * A version of a document in Firestore. This corresponds to the version
 * timestamp, such as update_time or read_time.
 */
declare class SnapshotVersion {
    private timestamp;
    static fromTimestamp(value: Timestamp): SnapshotVersion;
    static min(): SnapshotVersion;
    static max(): SnapshotVersion;
    private constructor();
    compareTo(other: SnapshotVersion): number;
    isEqual(other: SnapshotVersion): boolean;
    /** Returns a number representation of the version for use in spec tests. */
    toMicroseconds(): number;
    toString(): string;
    toTimestamp(): Timestamp;
}

declare class SortedMap<K, V> {
    comparator: Comparator<K>;
    root: LLRBNode<K, V> | LLRBEmptyNode<K, V>;
    constructor(comparator: Comparator<K>, root?: LLRBNode<K, V> | LLRBEmptyNode<K, V>);
    insert(key: K, value: V): SortedMap<K, V>;
    remove(key: K): SortedMap<K, V>;
    get(key: K): V | null;
    indexOf(key: K): number;
    isEmpty(): boolean;
    get size(): number;
    minKey(): K | null;
    maxKey(): K | null;
    inorderTraversal<T>(action: (k: K, v: V) => T): T;
    forEach(fn: (k: K, v: V) => void): void;
    toString(): string;
    reverseTraversal<T>(action: (k: K, v: V) => T): T;
    getIterator(): SortedMapIterator<K, V>;
    getIteratorFrom(key: K): SortedMapIterator<K, V>;
    getReverseIterator(): SortedMapIterator<K, V>;
    getReverseIteratorFrom(key: K): SortedMapIterator<K, V>;
}

declare class SortedMapIterator<K, V> {
    private isReverse;
    private nodeStack;
    constructor(node: LLRBNode<K, V> | LLRBEmptyNode<K, V>, startKey: K | null, comparator: Comparator<K>, isReverse: boolean);
    getNext(): Entry<K, V>;
    hasNext(): boolean;
    peek(): Entry<K, V> | null;
}

/**
 * SortedSet is an immutable (copy-on-write) collection that holds elements
 * in order specified by the provided comparator.
 *
 * NOTE: if provided comparator returns 0 for two elements, we consider them to
 * be equal!
 */
declare class SortedSet<T> {
    private comparator;
    private data;
    constructor(comparator: (left: T, right: T) => number);
    has(elem: T): boolean;
    first(): T | null;
    last(): T | null;
    get size(): number;
    indexOf(elem: T): number;
    /** Iterates elements in order defined by "comparator" */
    forEach(cb: (elem: T) => void): void;
    /** Iterates over `elem`s such that: range[0] &lt;= elem &lt; range[1]. */
    forEachInRange(range: [T, T], cb: (elem: T) => void): void;
    /**
     * Iterates over `elem`s such that: start &lt;= elem until false is returned.
     */
    forEachWhile(cb: (elem: T) => boolean, start?: T): void;
    /** Finds the least element greater than or equal to `elem`. */
    firstAfterOrEqual(elem: T): T | null;
    getIterator(): SortedSetIterator<T>;
    getIteratorFrom(key: T): SortedSetIterator<T>;
    /** Inserts or updates an element */
    add(elem: T): SortedSet<T>;
    /** Deletes an element */
    delete(elem: T): SortedSet<T>;
    isEmpty(): boolean;
    unionWith(other: SortedSet<T>): SortedSet<T>;
    isEqual(other: SortedSet<T>): boolean;
    toArray(): T[];
    toString(): string;
    private copy;
}

declare class SortedSetIterator<T> {
    private iter;
    constructor(iter: SortedMapIterator<T, boolean>);
    getNext(): T;
    hasNext(): boolean;
}

/**
 * Options defining how a SortStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(sort:1)}.
 */
export declare type SortStageOptions = StageOptions & {
    /**
     * Orderings specify how the input documents are sorted.
     * One or more ordering are required.
     */
    orderings: Ordering[];
};

/**
 * Creates an expression that splits the value of a field on the provided delimiter.
 *
 * @example
 * ```typescript
 * // Split the 'scoresCsv' field on delimiter ','
 * split('scoresCsv', ',')
 * ```
 *
 * @param fieldName - Split the value in this field.
 * @param delimiter - Split on this delimiter.
 *
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the split function.
 */
export declare function split(fieldName: string, delimiter: string): FunctionExpression;

/**
 * Creates an expression that splits the value of a field on the provided delimiter.
 *
 * @example
 * ```typescript
 * // Split the 'scores' field on delimiter ',' or ':' depending on the stored format
 * split('scores', conditional(field('format').equal('csv'), constant(','), constant(':')))
 * ```
 *
 * @param fieldName - Split the value in this field.
 * @param delimiter - Split on this delimiter returned by evaluating this expression.
 *
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the split function.
 */
export declare function split(fieldName: string, delimiter: Expression): FunctionExpression;

/**
 * Creates an expression that splits a string into an array of substrings based on the provided delimiter.
 *
 * @example
 * ```typescript
 * // Split the 'scoresCsv' field on delimiter ','
 * split(field('scoresCsv'), ',')
 * ```
 *
 * @param expression - Split the result of this expression.
 * @param delimiter - Split on this delimiter.
 *
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the split function.
 */
export declare function split(expression: Expression, delimiter: string): FunctionExpression;

/**
 * Creates an expression that splits a string into an array of substrings based on the provided delimiter.
 *
 * @example
 * ```typescript
 * // Split the 'scores' field on delimiter ',' or ':' depending on the stored format
 * split(field('scores'), conditional(field('format').equal('csv'), constant(','), constant(':')))
 * ```
 *
 * @param expression - Split the result of this expression.
 * @param delimiter - Split on this delimiter returned by evaluating this expression.
 *
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the split function.
 */
export declare function split(expression: Expression, delimiter: Expression): FunctionExpression;

/**
 * Creates an expression that computes the square root of a numeric value.
 *
 * @example
 * ```typescript
 * // Compute the square root of the 'value' field.
 * sqrt(field("value"));
 * ```
 *
 * @param expression - An expression evaluating to a numeric value, which the square root will be computed for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the square root of the numeric value.
 */
export declare function sqrt(expression: Expression): FunctionExpression;

/**
 * Creates an expression that computes the square root of a numeric value.
 *
 * @example
 * ```typescript
 * // Compute the square root of the 'value' field.
 * sqrt("value");
 * ```
 *
 * @param fieldName - The name of the field to compute the square root of.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the square root of the numeric value.
 */
export declare function sqrt(fieldName: string): FunctionExpression;

declare abstract class Stage implements ProtoSerializable<Stage_2>, UserData {
    /**
     * Store _optionsProto parsed by _readUserData.
     * @private
     * @internal
     * @protected
     */
    protected optionsProto: ApiClientObjectMap<firestoreV1ApiClientInterfaces.Value> | undefined;
    protected knownOptions: Record<string, unknown>;
    protected rawOptions?: Record<string, unknown>;
    constructor(options: Record<string, unknown> & StageOptions);
    _readUserData(context: ParseContext): void;
    _toProto(_: JsonProtoSerializer): Stage_2;
    abstract get _optionsUtil(): OptionsUtil;
    abstract get _name(): string;
}

declare type Stage_2 = firestoreV1ApiClientInterfaces.Stage;

/**
 * Options defining how a Stage is evaluated.
 */
export declare type StageOptions = {
    /**
     * An escape hatch to set options not known at SDK build time. These values
     * will be passed directly to the Firestore backend and not used by the SDK.
     *
     * The option name will be used as provided. And must match the name
     * format used by the backend (hint: use a snake_case_name).
     *
     * Raw option values can be any type supported
     * by Firestore (for example: string, boolean, number, map, …). Value types
     * not known to the SDK will be rejected.
     *
     * Values specified in rawOptions will take precedence over any options
     * with the same name set by the SDK.
     *
     * `rawOptions` supports dot notation, if you want to override
     * a nested option.
     */
    rawOptions?: {
        [name: string]: unknown;
    };
};

/**
 *
 * Creates an expression that checks if a field's value starts with a given prefix.
 *
 * @example
 * ```typescript
 * // Check if the 'name' field starts with "Mr."
 * startsWith("name", "Mr.");
 * ```
 *
 * @param fieldName - The field name to check.
 * @param prefix - The prefix to check for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'starts with' comparison.
 */
export declare function startsWith(fieldName: string, prefix: string): BooleanExpression;

/**
 *
 * Creates an expression that checks if a field's value starts with a given prefix.
 *
 * @example
 * ```typescript
 * // Check if the 'fullName' field starts with the value of the 'firstName' field
 * startsWith("fullName", field("firstName"));
 * ```
 *
 * @param fieldName - The field name to check.
 * @param prefix - The expression representing the prefix.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'starts with' comparison.
 */
export declare function startsWith(fieldName: string, prefix: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string expression starts with a given prefix.
 *
 * @example
 * ```typescript
 * // Check if the result of concatenating 'firstName' and 'lastName' fields starts with "Mr."
 * startsWith(field("fullName"), "Mr.");
 * ```
 *
 * @param stringExpression - The expression to check.
 * @param prefix - The prefix to check for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'starts with' comparison.
 */
export declare function startsWith(stringExpression: Expression, prefix: string): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string expression starts with a given prefix.
 *
 * @example
 * ```typescript
 * // Check if the result of concatenating 'firstName' and 'lastName' fields starts with "Mr."
 * startsWith(field("fullName"), field("prefix"));
 * ```
 *
 * @param stringExpression - The expression to check.
 * @param prefix - The prefix to check for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'starts with' comparison.
 */
export declare function startsWith(stringExpression: Expression, prefix: Expression): BooleanExpression;

/**
 *
 * Creates an expression that concatenates string functions, fields or constants together.
 *
 * @example
 * ```typescript
 * // Combine the 'firstName', " ", and 'lastName' fields into a single string
 * stringConcat("firstName", " ", field("lastName"));
 * ```
 *
 * @param fieldName - The field name containing the initial string value.
 * @param secondString - An expression or string literal to concatenate.
 * @param otherStrings - Optional additional expressions or literals (typically strings) to concatenate.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the concatenated string.
 */
export declare function stringConcat(fieldName: string, secondString: Expression | string, ...otherStrings: Array<Expression | string>): FunctionExpression;

/**
 * Creates an expression that concatenates string expressions together.
 *
 * @example
 * ```typescript
 * // Combine the 'firstName', " ", and 'lastName' fields into a single string
 * stringConcat(field("firstName"), " ", field("lastName"));
 * ```
 *
 * @param firstString - The initial string expression to concatenate to.
 * @param secondString - An expression or string literal to concatenate.
 * @param otherStrings - Optional additional expressions or literals (typically strings) to concatenate.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the concatenated string.
 */
export declare function stringConcat(firstString: Expression, secondString: Expression | string, ...otherStrings: Array<Expression | string>): FunctionExpression;

/**
 *
 * Creates an expression that checks if a string field contains a specified substring.
 *
 * @example
 * ```typescript
 * // Check if the 'description' field contains "example".
 * stringContains("description", "example");
 * ```
 *
 * @param fieldName - The name of the field containing the string.
 * @param substring - The substring to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'contains' comparison.
 */
export declare function stringContains(fieldName: string, substring: string): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string field contains a substring specified by an expression.
 *
 * @example
 * ```typescript
 * // Check if the 'description' field contains the value of the 'keyword' field.
 * stringContains("description", field("keyword"));
 * ```
 *
 * @param fieldName - The name of the field containing the string.
 * @param substring - The expression representing the substring to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'contains' comparison.
 */
export declare function stringContains(fieldName: string, substring: Expression): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string expression contains a specified substring.
 *
 * @example
 * ```typescript
 * // Check if the 'description' field contains "example".
 * stringContains(field("description"), "example");
 * ```
 *
 * @param stringExpression - The expression representing the string to perform the comparison on.
 * @param substring - The substring to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'contains' comparison.
 */
export declare function stringContains(stringExpression: Expression, substring: string): BooleanExpression;

/**
 *
 * Creates an expression that checks if a string expression contains a substring specified by another expression.
 *
 * @example
 * ```typescript
 * // Check if the 'description' field contains the value of the 'keyword' field.
 * stringContains(field("description"), field("keyword"));
 * ```
 *
 * @param stringExpression - The expression representing the string to perform the comparison on.
 * @param substring - The expression representing the substring to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the 'contains' comparison.
 */
export declare function stringContains(stringExpression: Expression, substring: Expression): BooleanExpression;

/**
 * Creates an expression that finds the index of the first occurrence of a substring or byte sequence.
 *
 * @example
 * ```typescript
 * // Find the index of "foo" in the 'text' field
 * stringIndexOf("text", "foo");
 * ```
 *
 * @param fieldName - The name of the field containing the string or byte array.
 * @param search - The substring or byte sequence to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the index of the first occurrence.
 */
export declare function stringIndexOf(fieldName: string, search: string | Expression | Bytes): FunctionExpression;

/**
 * Creates an expression that finds the index of the first occurrence of a substring or byte sequence.
 *
 * @example
 * ```typescript
 * // Find the index of "foo" in the 'text' field
 * stringIndexOf(field("text"), "foo");
 * ```
 *
 * @param expression - The expression representing the string or byte array.
 * @param search - The substring or byte sequence to search for.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the index of the first occurrence.
 */
export declare function stringIndexOf(expression: Expression, search: string | Expression | Bytes): FunctionExpression;

/**
 * Creates an expression that repeats a string or byte array a specified number of times.
 *
 * @example
 * ```typescript
 * // Repeat the 'label' field 3 times
 * stringRepeat("label", 3);
 * ```
 *
 * @param fieldName - The name of the field containing the string or byte array.
 * @param repetitions - The number of times to repeat the string or byte array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the repeated string or byte array.
 */
export declare function stringRepeat(fieldName: string, repetitions: number | Expression): FunctionExpression;

/**
 * Creates an expression that repeats a string or byte array a specified number of times.
 *
 * @example
 * ```typescript
 * // Repeat the 'label' field 3 times
 * stringRepeat(field("label"), 3);
 * ```
 *
 * @param expression - The expression representing the string or byte array.
 * @param repetitions - The number of times to repeat the string or byte array.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the repeated string or byte array.
 */
export declare function stringRepeat(expression: Expression, repetitions: number | Expression): FunctionExpression;

/**
 * Creates an expression that replaces all occurrences of a substring or byte sequence with a replacement.
 *
 * @example
 * ```typescript
 * // Replace all occurrences of "foo" with "bar" in the 'text' field
 * stringReplaceAll("text", "foo", "bar");
 * ```
 *
 * @param fieldName - The name of the field containing the string or byte array.
 * @param find - The substring or byte sequence to search for.
 * @param replacement - The replacement string or byte sequence.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the string or byte array with replacements.
 */
export declare function stringReplaceAll(fieldName: string, find: string | Expression | Bytes, replacement: string | Expression | Bytes): FunctionExpression;

/**
 * Creates an expression that replaces all occurrences of a substring or byte sequence with a replacement.
 *
 * @example
 * ```typescript
 * // Replace all occurrences of "foo" with "bar" in the 'text' field
 * stringReplaceAll(field("text"), "foo", "bar");
 * ```
 *
 * @param expression - The expression representing the string or byte array.
 * @param find - The substring or byte sequence to search for.
 * @param replacement - The replacement string or byte sequence.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the string or byte array with replacements.
 */
export declare function stringReplaceAll(expression: Expression, find: string | Expression | Bytes, replacement: string | Expression | Bytes): FunctionExpression;

/**
 * Creates an expression that replaces the first occurrence of a substring or byte sequence with a replacement.
 *
 * @example
 * ```typescript
 * // Replace the first occurrence of "foo" with "bar" in the 'text' field
 * stringReplaceOne("text", "foo", "bar");
 * ```
 *
 * @param fieldName - The name of the field containing the string or byte array.
 * @param find - The substring or byte sequence to search for.
 * @param replacement - The replacement string or byte sequence.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the string or byte array with the replacement.
 */
export declare function stringReplaceOne(fieldName: string, find: string | Expression | Bytes, replacement: string | Expression | Bytes): FunctionExpression;

/**
 * Creates an expression that replaces the first occurrence of a substring or byte sequence with a replacement.
 *
 * @example
 * ```typescript
 * // Replace the first occurrence of "foo" with "bar" in the 'text' field
 * stringReplaceOne(field("text"), "foo", "bar");
 * ```
 *
 * @param expression - The expression representing the string or byte array.
 * @param find - The substring or byte sequence to search for.
 * @param replacement - The replacement string or byte sequence.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the string or byte array with the replacement.
 */
export declare function stringReplaceOne(expression: Expression, find: string | Expression | Bytes, replacement: string | Expression | Bytes): FunctionExpression;

/**
 * Creates an expression that reverses a string.
 *
 * @example
 * ```typescript
 * // Reverse the value of the 'myString' field.
 * stringReverse(field("myString"));
 * ```
 *
 * @param stringExpression - An expression evaluating to a string value, which will be reversed.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the reversed string.
 */
export declare function stringReverse(stringExpression: Expression): FunctionExpression;

/**
 * Creates an expression that reverses a string value in the specified field.
 *
 * @example
 * ```typescript
 * // Reverse the value of the 'myString' field.
 * stringReverse("myString");
 * ```
 *
 * @param field - The name of the field representing the string to reverse.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the reversed string.
 */
export declare function stringReverse(field: string): FunctionExpression;

declare type StructuredQuery = firestoreV1ApiClientInterfaces.StructuredQuery;

/**
 * @public
 * Creates a new Pipeline targeted at a subcollection relative to the current document context.
 * This creates a pipeline without a database instance, suitable for embedding as a subquery.
 * If executed directly, this pipeline will fail.
 *
 * @param path - The relative path to the subcollection.
 */
export declare function subcollection(path: string): Pipeline_2;

/**
 * @public
 * Creates a new Pipeline targeted at a subcollection relative to the current document context.
 * This creates a pipeline without a database instance, suitable for embedding as a subquery.
 * If executed directly, this pipeline will fail.
 *
 * @param options - Options defining how this SubcollectionStage is evaluated.
 */
export declare function subcollection(options: SubcollectionStageOptions): Pipeline_2;

/**
 * @public
 * Options defining how a `SubcollectionStage` is evaluated.
 */
export declare type SubcollectionStageOptions = StageOptions & {
    /**
     * @public
     * The relative path to the subcollection.
     */
    path: string;
};

/**
 *
 * Creates an expression that returns a substring of a string or byte array.
 *
 * @param field - The name of a field containing a string or byte array to compute the substring from.
 * @param position - Index of the first character of the substring.
 * @param length - Length of the substring.
 */
export declare function substring(field: string, position: number, length?: number): FunctionExpression;

/**
 *
 * Creates an expression that returns a substring of a string or byte array.
 *
 * @param input - An expression returning a string or byte array to compute the substring from.
 * @param position - Index of the first character of the substring.
 * @param length - Length of the substring.
 */
export declare function substring(input: Expression, position: number, length?: number): FunctionExpression;

/**
 *
 * Creates an expression that returns a substring of a string or byte array.
 *
 * @param field - The name of a field containing a string or byte array to compute the substring from.
 * @param position - An expression that returns the index of the first character of the substring.
 * @param length - An expression that returns the length of the substring.
 */
export declare function substring(field: string, position: Expression, length?: Expression): FunctionExpression;

/**
 *
 * Creates an expression that returns a substring of a string or byte array.
 *
 * @param input - An expression returning a string or byte array to compute the substring from.
 * @param position - An expression that returns the index of the first character of the substring.
 * @param length - An expression that returns the length of the substring.
 */
export declare function substring(input: Expression, position: Expression, length?: Expression): FunctionExpression;

/**
 *
 * Creates an expression that subtracts two expressions.
 *
 * @example
 * ```typescript
 * // Subtract the 'discount' field from the 'price' field
 * subtract(field("price"), field("discount"));
 * ```
 *
 * @param left - The expression to subtract from.
 * @param right - The expression to subtract.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the subtraction operation.
 */
export declare function subtract(left: Expression, right: Expression): FunctionExpression;

/**
 *
 * Creates an expression that subtracts a constant value from an expression.
 *
 * @example
 * ```typescript
 * // Subtract the constant value 2 from the 'value' field
 * subtract(field("value"), 2);
 * ```
 *
 * @param expression - The expression to subtract from.
 * @param value - The constant value to subtract.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the subtraction operation.
 */
export declare function subtract(expression: Expression, value: unknown): FunctionExpression;

/**
 *
 * Creates an expression that subtracts an expression from a field's value.
 *
 * @example
 * ```typescript
 * // Subtract the 'discount' field from the 'price' field
 * subtract("price", field("discount"));
 * ```
 *
 * @param fieldName - The field name to subtract from.
 * @param expression - The expression to subtract.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the subtraction operation.
 */
export declare function subtract(fieldName: string, expression: Expression): FunctionExpression;

/**
 *
 * Creates an expression that subtracts a constant value from a field's value.
 *
 * @example
 * ```typescript
 * // Subtract 20 from the value of the 'total' field
 * subtract("total", 20);
 * ```
 *
 * @param fieldName - The field name to subtract from.
 * @param value - The constant value to subtract.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the subtraction operation.
 */
export declare function subtract(fieldName: string, value: unknown): FunctionExpression;

/**
 *
 * Creates an aggregation that calculates the sum of values from an expression across multiple
 * stage inputs.
 *
 * @example
 * ```typescript
 * // Calculate the total revenue from a set of orders
 * sum(field("orderAmount")).as("totalRevenue");
 * ```
 *
 * @param expression - The expression to sum up.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'sum' aggregation.
 */
export declare function sum(expression: Expression): AggregateFunction;

/**
 *
 * Creates an aggregation that calculates the sum of a field's values across multiple stage
 * inputs.
 *
 * @example
 * ```typescript
 * // Calculate the total revenue from a set of orders
 * sum("orderAmount").as("totalRevenue");
 * ```
 *
 * @param fieldName - The name of the field containing numeric values to sum up.
 * @returns A new {@link @firebase/firestore/pipelines#AggregateFunction} representing the 'sum' aggregation.
 */
export declare function sum(fieldName: string): AggregateFunction;

/**
 * Creates an expression that evaluates to the result corresponding to the first true condition.
 *
 * @remarks
 * This function behaves like a `switch` statement. It accepts an alternating sequence of conditions
 * and their corresponding results.
 * If an odd number of arguments is provided, the final argument serves as a default fallback result.
 * If no default is provided and no condition evaluates to true, it throws an error.
 *
 * @example
 * ```typescript
 * // Return "Active" if field "status" is 1, "Pending" if field "status" is 2,
 * // and default to "Unknown" if none of the conditions are true.
 * switchOn(
 *   equal(field("status"), 1), constant("Active"),
 *   equal(field("status"), 2), constant("Pending"),
 *   constant("Unknown")
 * )
 * ```
 *
 * @param condition - The first condition to check.
 * @param result - The result if the first condition is true.
 * @param others - Additional conditions and results, and optionally a default value.
 * @returns A new Expression representing the switch operation.
 */
export declare function switchOn(condition: BooleanExpression, result: Expression, ...others: Array<BooleanExpression | Expression>): FunctionExpression;

/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * SyncEngine is the central controller in the client SDK architecture. It is
 * the glue code between the EventManager, LocalStore, and RemoteStore. Some of
 * SyncEngine's responsibilities include:
 * 1. Coordinating client requests and remote events between the EventManager
 *    and the local and remote data stores.
 * 2. Managing a View object for each query, providing the unified view between
 *    the local and remote data stores.
 * 3. Notifying the RemoteStore when the LocalStore has new mutations in its
 *    queue that need sending to the backend.
 *
 * The SyncEngine’s methods should only ever be called by methods running in the
 * global async queue.
 *
 * PORTING NOTE: On Web, SyncEngine does not have an explicit subscribe()
 * function. Instead, it directly depends on EventManager's tree-shakeable API
 * (via `ensureWatchStream()`).
 */
declare interface SyncEngine {
    isPrimaryClient: boolean;
}

/**
 * A Target represents the WatchTarget representation of a Query, which is used
 * by the LocalStore and the RemoteStore to keep track of and to execute
 * backend queries. While a Query can represent multiple Targets, each Targets
 * maps to a single WatchTarget in RemoteStore and a single TargetData entry
 * in persistence.
 */
declare interface Target {
    readonly path: ResourcePath;
    readonly collectionGroup: string | null;
    readonly orderBy: OrderBy[];
    readonly filters: Filter[];
    readonly limit: number | null;
    readonly startAt: Bound | null;
    readonly endAt: Bound | null;
}

/**
 * Represents cached targets received from the remote backend.
 *
 * The cache is keyed by `Target` and entries in the cache are `TargetData`
 * instances.
 */
declare interface TargetCache {
    /**
     * A global snapshot version representing the last consistent snapshot we
     * received from the backend. This is monotonically increasing and any
     * snapshots received from the backend prior to this version (e.g. for targets
     * resumed with a resume_token) should be suppressed (buffered) until the
     * backend has caught up to this snapshot version again. This prevents our
     * cache from ever going backwards in time.
     *
     * This is updated whenever our we get a TargetChange with a read_time and
     * empty target_ids.
     */
    getLastRemoteSnapshotVersion(transaction: PersistenceTransaction): PersistencePromise<SnapshotVersion>;
    /**
     * @returns The highest sequence number observed, including any that might be
     *         persisted on-disk.
     */
    getHighestSequenceNumber(transaction: PersistenceTransaction): PersistencePromise<ListenSequenceNumber>;
    /**
     * Call provided function with each `TargetData` that we have cached.
     */
    forEachTarget(txn: PersistenceTransaction, f: (q: TargetData) => void): PersistencePromise<void>;
    /**
     * Set the highest listen sequence number and optionally updates the
     * snapshot version of the last consistent snapshot received from the backend
     * (see getLastRemoteSnapshotVersion() for more details).
     *
     * @param highestListenSequenceNumber - The new maximum listen sequence number.
     * @param lastRemoteSnapshotVersion - The new snapshot version. Optional.
     */
    setTargetsMetadata(transaction: PersistenceTransaction, highestListenSequenceNumber: number, lastRemoteSnapshotVersion?: SnapshotVersion): PersistencePromise<void>;
    /**
     * Adds an entry in the cache.
     *
     * The cache key is extracted from `targetData.target`. The key must not already
     * exist in the cache.
     *
     * @param targetData - A TargetData instance to put in the cache.
     */
    addTargetData(transaction: PersistenceTransaction, targetData: TargetData): PersistencePromise<void>;
    /**
     * Updates an entry in the cache.
     *
     * The cache key is extracted from `targetData.target`. The entry must already
     * exist in the cache, and it will be replaced.
     * @param targetData - The TargetData to be replaced into the cache.
     */
    updateTargetData(transaction: PersistenceTransaction, targetData: TargetData): PersistencePromise<void>;
    /**
     * Removes the cached entry for the given target data. It is an error to remove
     * a target data that does not exist.
     *
     * Multi-Tab Note: This operation should only be called by the primary client.
     */
    removeTargetData(transaction: PersistenceTransaction, targetData: TargetData): PersistencePromise<void>;
    /**
     * The number of targets currently in the cache.
     */
    getTargetCount(transaction: PersistenceTransaction): PersistencePromise<number>;
    /**
     * Looks up a TargetData entry by target.
     *
     * @param target - The query target corresponding to the entry to look up.
     * @returns The cached TargetData entry, or null if the cache has no entry for
     * the target.
     */
    getTargetData(transaction: PersistenceTransaction, target: TargetOrPipeline): PersistencePromise<TargetData | null>;
    /**
     * Adds the given document keys to cached query results of the given target
     * ID.
     *
     * Multi-Tab Note: This operation should only be called by the primary client.
     */
    addMatchingKeys(transaction: PersistenceTransaction, keys: DocumentKeySet, targetId: TargetId): PersistencePromise<void>;
    /**
     * Removes the given document keys from the cached query results of the
     * given target ID.
     *
     * Multi-Tab Note: This operation should only be called by the primary client.
     */
    removeMatchingKeys(transaction: PersistenceTransaction, keys: DocumentKeySet, targetId: TargetId): PersistencePromise<void>;
    /**
     * Removes all the keys in the query results of the given target ID.
     *
     * Multi-Tab Note: This operation should only be called by the primary client.
     */
    removeMatchingKeysForTargetId(transaction: PersistenceTransaction, targetId: TargetId): PersistencePromise<void>;
    /**
     * Returns the document keys that match the provided target ID.
     */
    getMatchingKeysForTargetId(transaction: PersistenceTransaction, targetId: TargetId): PersistencePromise<DocumentKeySet>;
    /**
     * Returns a new target ID that is higher than any query in the cache. If
     * there are no queries in the cache, returns the first valid target ID.
     * Allocated target IDs are persisted and `allocateTargetId()` will never
     * return the same ID twice.
     */
    allocateTargetId(transaction: PersistenceTransaction): PersistencePromise<TargetId>;
    containsKey(transaction: PersistenceTransaction, key: DocumentKey): PersistencePromise<boolean>;
}

/**
 * A TargetChange specifies the set of changes for a specific target as part of
 * a RemoteEvent. These changes track which documents are added, modified or
 * removed, as well as the target's resume token and whether the target is
 * marked CURRENT.
 * The actual changes *to* documents are not part of the TargetChange since
 * documents may be part of multiple targets.
 */
declare class TargetChange {
    /**
     * An opaque, server-assigned token that allows watching a query to be resumed
     * after disconnecting without retransmitting all the data that matches the
     * query. The resume token essentially identifies a point in time from which
     * the server should resume sending results.
     */
    readonly resumeToken: ByteString;
    /**
     * The "current" (synced) status of this target. Note that "current"
     * has special meaning in the RPC protocol that implies that a target is
     * both up-to-date and consistent with the rest of the watch stream.
     */
    readonly current: boolean;
    /**
     * The set of documents that were newly assigned to this target as part of
     * this remote event.
     */
    readonly addedDocuments: DocumentKeySet;
    /**
     * The set of documents that were already assigned to this target but received
     * an update during this remote event.
     */
    readonly modifiedDocuments: DocumentKeySet;
    /**
     * The set of documents that were removed from this target as part of this
     * remote event.
     */
    readonly removedDocuments: DocumentKeySet;
    constructor(
    /**
     * An opaque, server-assigned token that allows watching a query to be resumed
     * after disconnecting without retransmitting all the data that matches the
     * query. The resume token essentially identifies a point in time from which
     * the server should resume sending results.
     */
    resumeToken: ByteString, 
    /**
     * The "current" (synced) status of this target. Note that "current"
     * has special meaning in the RPC protocol that implies that a target is
     * both up-to-date and consistent with the rest of the watch stream.
     */
    current: boolean, 
    /**
     * The set of documents that were newly assigned to this target as part of
     * this remote event.
     */
    addedDocuments: DocumentKeySet, 
    /**
     * The set of documents that were already assigned to this target but received
     * an update during this remote event.
     */
    modifiedDocuments: DocumentKeySet, 
    /**
     * The set of documents that were removed from this target as part of this
     * remote event.
     */
    removedDocuments: DocumentKeySet);
    /**
     * This method is used to create a synthesized TargetChanges that can be used to
     * apply a CURRENT status change to a View (for queries executed in a different
     * tab) or for new queries (to raise snapshots with correct CURRENT status).
     */
    static createSynthesizedTargetChangeForCurrentChange(targetId: TargetId, current: boolean, resumeToken: ByteString): TargetChange;
}

declare type TargetChangeTargetChangeType = 'NO_CHANGE' | 'ADD' | 'REMOVE' | 'CURRENT' | 'RESET';

/**
 * An immutable set of metadata that the local store tracks for each target.
 */
declare class TargetData<T extends TargetId | RemoteTargetId = TargetId> {
    /** The target being listened to. */
    readonly target: TargetOrPipeline;
    /**
     * The target ID to which the target corresponds; Assigned by the
     * LocalStore for user listens and by the SyncEngine for limbo watches.
     */
    readonly targetId: T;
    /** The purpose of the target. */
    readonly purpose: TargetPurpose;
    /**
     * The sequence number of the last transaction during which this target data
     * was modified.
     */
    readonly sequenceNumber: ListenSequenceNumber;
    /** The latest snapshot version seen for this target. */
    readonly snapshotVersion: SnapshotVersion;
    /**
     * The maximum snapshot version at which the associated view
     * contained no limbo documents.
     */
    readonly lastLimboFreeSnapshotVersion: SnapshotVersion;
    /**
     * An opaque, server-assigned token that allows watching a target to be
     * resumed after disconnecting without retransmitting all the data that
     * matches the target. The resume token essentially identifies a point in
     * time from which the server should resume sending results.
     */
    readonly resumeToken: ByteString;
    /**
     * The number of documents that last matched the query at the resume token or
     * read time. Documents are counted only when making a listen request with
     * resume token or read time, otherwise, keep it null.
     */
    readonly expectedCount: number | null;
    constructor(
    /** The target being listened to. */
    target: TargetOrPipeline, 
    /**
     * The target ID to which the target corresponds; Assigned by the
     * LocalStore for user listens and by the SyncEngine for limbo watches.
     */
    targetId: T, 
    /** The purpose of the target. */
    purpose: TargetPurpose, 
    /**
     * The sequence number of the last transaction during which this target data
     * was modified.
     */
    sequenceNumber: ListenSequenceNumber, 
    /** The latest snapshot version seen for this target. */
    snapshotVersion?: SnapshotVersion, 
    /**
     * The maximum snapshot version at which the associated view
     * contained no limbo documents.
     */
    lastLimboFreeSnapshotVersion?: SnapshotVersion, 
    /**
     * An opaque, server-assigned token that allows watching a target to be
     * resumed after disconnecting without retransmitting all the data that
     * matches the target. The resume token essentially identifies a point in
     * time from which the server should resume sending results.
     */
    resumeToken?: ByteString, 
    /**
     * The number of documents that last matched the query at the resume token or
     * read time. Documents are counted only when making a listen request with
     * resume token or read time, otherwise, keep it null.
     */
    expectedCount?: number | null);
    /** Creates a new target data instance with an updated sequence number. */
    withSequenceNumber(sequenceNumber: number): TargetData<T>;
    /**
     * Creates a new target data instance with an updated resume token and
     * snapshot version.
     */
    withResumeToken(resumeToken: ByteString, snapshotVersion: SnapshotVersion): TargetData<T>;
    /**
     * Creates a new target data instance with an updated expected count.
     */
    withExpectedCount(expectedCount: number): TargetData<T>;
    /**
     * Creates a new target data instance with an updated last limbo free
     * snapshot version number.
     */
    withLastLimboFreeSnapshotVersion(lastLimboFreeSnapshotVersion: SnapshotVersion): TargetData<T>;
}

/**
 * A locally-assigned ID used to refer to a target being tracked in the local
 * store.
 */
declare type TargetId = number & {
    readonly __brand?: 'sdk';
};

declare type TargetOrPipeline = Target | CorePipeline;

/** An enumeration of the different purposes we have for targets. */
declare const enum TargetPurpose {
    /** A regular, normal query target. */
    Listen = "TargetPurposeListen",
    /**
     * The query target was used to refill a query after an existence filter
     * mismatch.
     */
    ExistenceFilterMismatch = "TargetPurposeExistenceFilterMismatch",
    /**
     * The query target was used if the query is the result of a false positive in
     * the bloom filter.
     */
    ExistenceFilterMismatchBloom = "TargetPurposeExistenceFilterMismatchBloom",
    /** The query target was used to resolve a limbo document. */
    LimboResolution = "TargetPurposeLimboResolution"
}

/**
 * Specify time granularity for expressions.
 */
export declare type TimeGranularity = TimeUnit | 'week' | 'week(monday)' | 'week(tuesday)' | 'week(wednesday)' | 'week(thursday)' | 'week(friday)' | 'week(saturday)' | 'week(sunday)' | 'isoweek' | 'month' | 'quarter' | 'year' | 'isoyear';

/**
 * Specify time parts for `timestampExtract` expressions.
 */
export declare type TimePart = TimeGranularity | 'dayofweek' | 'dayofyear';

/**
 * Wellknown "timer" IDs used when scheduling delayed operations on the
 * AsyncQueue. These IDs can then be used from tests to check for the presence
 * of operations or to run them early.
 *
 * The string values are used when encoding these timer IDs in JSON spec tests.
 */
declare const enum TimerId {
    /** All can be used with runDelayedOperationsEarly() to run all timers. */
    All = "all",
    /**
     * The following 5 timers are used in persistent_stream.ts for the listen and
     * write streams. The "Idle" timer is used to close the stream due to
     * inactivity. The "ConnectionBackoff" timer is used to restart a stream once
     * the appropriate backoff delay has elapsed. The health check is used to mark
     * a stream healthy if it has not received an error during its initial setup.
     */
    ListenStreamIdle = "listen_stream_idle",
    ListenStreamConnectionBackoff = "listen_stream_connection_backoff",
    WriteStreamIdle = "write_stream_idle",
    WriteStreamConnectionBackoff = "write_stream_connection_backoff",
    HealthCheckTimeout = "health_check_timeout",
    /**
     * A timer used in online_state_tracker.ts to transition from
     * OnlineState.Unknown to Offline after a set timeout, rather than waiting
     * indefinitely for success or failure.
     */
    OnlineStateTimeout = "online_state_timeout",
    /**
     * A timer used to update the client metadata in IndexedDb, which is used
     * to determine the primary leaseholder.
     */
    ClientMetadataRefresh = "client_metadata_refresh",
    /** A timer used to periodically attempt LRU Garbage collection */
    LruGarbageCollection = "lru_garbage_collection",
    /**
     * A timer used to retry transactions. Since there can be multiple concurrent
     * transactions, multiple of these may be in the queue at a given time.
     */
    TransactionRetry = "transaction_retry",
    /**
     * A timer used to retry operations scheduled via retryable AsyncQueue
     * operations.
     */
    AsyncQueueRetry = "async_queue_retry",
    /**
     *  A timer used to periodically attempt index backfill.
     */
    IndexBackfill = "index_backfill"
}

/**
 * A `Timestamp` represents a point in time independent of any time zone or
 * calendar, represented as seconds and fractions of seconds at nanosecond
 * resolution in UTC Epoch time.
 *
 * It is encoded using the Proleptic Gregorian Calendar which extends the
 * Gregorian calendar backwards to year one. It is encoded assuming all minutes
 * are 60 seconds long, i.e. leap seconds are "smeared" so that no leap second
 * table is needed for interpretation. Range is from 0001-01-01T00:00:00Z to
 * 9999-12-31T23:59:59.999999999Z.
 *
 * For examples and further specifications, refer to the
 * {@link https://github.com/google/protobuf/blob/master/src/google/protobuf/timestamp.proto | Timestamp definition}.
 */
export declare class Timestamp {
    /**
     * The number of seconds of UTC time since Unix epoch 1970-01-01T00:00:00Z.
     */
    readonly seconds: number;
    /**
     * The fractions of a second at nanosecond resolution.*
     */
    readonly nanoseconds: number;
    /**
     * Creates a new timestamp with the current date, with millisecond precision.
     *
     * @returns a new timestamp representing the current date.
     */
    static now(): Timestamp;
    /**
     * Creates a new timestamp from the given date.
     *
     * @param date - The date to initialize the `Timestamp` from.
     * @returns A new `Timestamp` representing the same point in time as the given
     *     date.
     */
    static fromDate(date: Date): Timestamp;
    /**
     * Creates a new timestamp from the given number of milliseconds.
     *
     * @param milliseconds - Number of milliseconds since Unix epoch
     *     1970-01-01T00:00:00Z.
     * @returns A new `Timestamp` representing the same point in time as the given
     *     number of milliseconds.
     */
    static fromMillis(milliseconds: number): Timestamp;
    /**
     * Creates a new timestamp.
     *
     * @param seconds - The number of seconds of UTC time since Unix epoch
     *     1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
     *     9999-12-31T23:59:59Z inclusive.
     * @param nanoseconds - The non-negative fractions of a second at nanosecond
     *     resolution. Negative second values with fractions must still have
     *     non-negative nanoseconds values that count forward in time. Must be
     *     from 0 to 999,999,999 inclusive.
     */
    constructor(
    /**
     * The number of seconds of UTC time since Unix epoch 1970-01-01T00:00:00Z.
     */
    seconds: number, 
    /**
     * The fractions of a second at nanosecond resolution.*
     */
    nanoseconds: number);
    /**
     * Converts a `Timestamp` to a JavaScript `Date` object. This conversion
     * causes a loss of precision since `Date` objects only support millisecond
     * precision.
     *
     * @returns JavaScript `Date` object representing the same point in time as
     *     this `Timestamp`, with millisecond precision.
     */
    toDate(): Date;
    /**
     * Converts a `Timestamp` to a numeric timestamp (in milliseconds since
     * epoch). This operation causes a loss of precision.
     *
     * @returns The point in time corresponding to this timestamp, represented as
     *     the number of milliseconds since Unix epoch 1970-01-01T00:00:00Z.
     */
    toMillis(): number;
    _compareTo(other: Timestamp): number;
    /**
     * Returns true if this `Timestamp` is equal to the provided one.
     *
     * @param other - The `Timestamp` to compare against.
     * @returns true if this `Timestamp` is equal to the provided one.
     */
    isEqual(other: Timestamp): boolean;
    /** Returns a textual representation of this `Timestamp`. */
    toString(): string;
    static _jsonSchemaVersion: string;
    static _jsonSchema: {
        type: Property<"string">;
        seconds: Property<"number">;
        nanoseconds: Property<"number">;
    };
    /**
     * Returns a JSON-serializable representation of this `Timestamp`.
     */
    toJSON(): {
        seconds: number;
        nanoseconds: number;
        type: string;
    };
    /**
     * Builds a `Timestamp` instance from a JSON object created by {@link Timestamp.toJSON}.
     */
    static fromJSON(json: object): Timestamp;
    /**
     * Converts this object to a primitive string, which allows `Timestamp` objects
     * to be compared using the `>`, `<=`, `>=` and `>` operators.
     */
    valueOf(): string;
}

declare type Timestamp_2 = string | {
    seconds?: string | number;
    nanos?: number;
};

/**
 *
 * Creates an expression that adds a specified amount of time to a timestamp.
 *
 * @example
 * ```typescript
 * // Add some duration determined by field 'unit' and 'amount' to the 'timestamp' field.
 * timestampAdd(field("timestamp"), field("unit"), field("amount"));
 * ```
 *
 * @param timestamp - The expression representing the timestamp.
 * @param unit - The expression evaluates to unit of time, must be one of 'microsecond', 'millisecond', 'second', 'minute', 'hour', 'day'.
 * @param amount - The expression evaluates to amount of the unit.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the resulting timestamp.
 */
export declare function timestampAdd(timestamp: Expression, unit: Expression, amount: Expression): FunctionExpression;

/**
 *
 * Creates an expression that adds a specified amount of time to a timestamp.
 *
 * @example
 * ```typescript
 * // Add 1 day to the 'timestamp' field.
 * timestampAdd(field("timestamp"), "day", 1);
 * ```
 *
 * @param timestamp - The expression representing the timestamp.
 * @param unit - The unit of time to add (e.g., "day", "hour").
 * @param amount - The amount of time to add.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the resulting timestamp.
 */
export declare function timestampAdd(timestamp: Expression, unit: TimeUnit, amount: number): FunctionExpression;

/**
 *
 * Creates an expression that adds a specified amount of time to a timestamp represented by a field.
 *
 * @example
 * ```typescript
 * // Add 1 day to the 'timestamp' field.
 * timestampAdd("timestamp", "day", 1);
 * ```
 *
 * @param fieldName - The name of the field representing the timestamp.
 * @param unit - The unit of time to add (e.g., "day", "hour").
 * @param amount - The amount of time to add.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the resulting timestamp.
 */
export declare function timestampAdd(fieldName: string, unit: TimeUnit, amount: number): FunctionExpression;

export declare function timestampDiff(endFieldName: string, startFieldName: string, unit: TimeUnit | Expression): FunctionExpression;

/**
 * Creates an expression that calculates the difference between two timestamps.
 *
 * @example
 * ```typescript
 * // Calculate the difference in days between 'endTime' field and a starting timestamp expression.
 * timestampDiff('endTime', field('startTime'), 'day')
 * ```
 *
 * @param endFieldName - The name of the field representing the ending timestamp.
 * @param startExpression - The starting timestamp for the difference calculation.
 * @param unit - The unit of time for the difference (e.g., "day", "hour").
 * @returns A new `Expression` representing the difference as an integer.
 */
export declare function timestampDiff(endFieldName: string, startExpression: Expression, unit: TimeUnit | Expression): FunctionExpression;

/**
 * Creates an expression that calculates the difference between two timestamps.
 *
 * @example
 * ```typescript
 * // Calculate the difference in days between an ending timestamp expression and 'startTime' field.
 * timestampDiff(field('endTime'), 'startTime', 'day')
 * ```
 *
 * @param endExpression - The ending timestamp for the difference calculation.
 * @param startFieldName - The name of the field representing the starting timestamp.
 * @param unit - The unit of time for the difference (e.g., "day", "hour").
 * @returns A new `Expression` representing the difference as an integer.
 */
export declare function timestampDiff(endExpression: Expression, startFieldName: string, unit: TimeUnit | Expression): FunctionExpression;

/**
 * Creates an expression that calculates the difference between two timestamps.
 *
 * @example
 * ```typescript
 * // Calculate the difference in days between two timestamp expressions.
 * timestampDiff(field('endTime'), field('startTime'), 'day')
 * ```
 *
 * @param endExpression - The ending timestamp for the difference calculation.
 * @param startExpression - The starting timestamp for the difference calculation.
 * @param unit - The unit of time for the difference (e.g., "day", "hour").
 * @returns A new `Expression` representing the difference as an integer.
 */
export declare function timestampDiff(endExpression: Expression, startExpression: Expression, unit: TimeUnit | Expression): FunctionExpression;

/**
 * Creates an expression that extracts a specified part from a timestamp.
 *
 * @example
 * ```typescript
 * // Extract the year from the 'createdAt' timestamp.
 * timestampExtract('createdAt', 'year')
 * ```
 *
 * @param fieldName - The name of the field representing the timestamp.
 * @param part - The part to extract from the timestamp (e.g., "year", "month", "day").
 * @param timezone - The timezone to use for extraction. Valid values are from
 * the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1."
 * @returns A new `Expression` representing the extracted part as an integer.
 */
export declare function timestampExtract(fieldName: string, part: TimePart, timezone?: string | Expression): FunctionExpression;

/**
 * Creates an expression that extracts a specified part from a timestamp.
 *
 * @example
 * ```typescript
 * // Extract the part specified by the field 'part' from 'createdAt'.
 * timestampExtract('createdAt', field('part'))
 * ```
 *
 * @param fieldName - The name of the field representing the timestamp.
 * @param part - The expression evaluating to the part to extract.
 * @param timezone - The timezone to use for extraction. Valid values are from
 * the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1."
 * @returns A new `Expression` representing the extracted part as an integer.
 */
export declare function timestampExtract(fieldName: string, part: Expression, timezone?: string | Expression): FunctionExpression;

/**
 * Creates an expression that extracts a specified part from a timestamp.
 *
 * @example
 * ```typescript
 * // Extract the year from the timestamp returned by the expression.
 * timestampExtract(field('createdAt'), 'year')
 * ```
 *
 * @param timestampExpression - The expression evaluating to the timestamp.
 * @param part - The part to extract from the timestamp (e.g., "year", "month", "day").
 * @param timezone - The timezone to use for extraction. Valid values are from
 * the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1."
 * @returns A new `Expression` representing the extracted part as an integer.
 */
export declare function timestampExtract(timestampExpression: Expression, part: TimePart, timezone?: string | Expression): FunctionExpression;

/**
 * Creates an expression that extracts a specified part from a timestamp.
 *
 * @example
 * ```typescript
 * // Extract the part specified by the field 'part' from the timestamp.
 * timestampExtract(field('createdAt'), field('part'))
 * ```
 *
 * @param timestampExpression - The expression evaluating to the timestamp.
 * @param part - The expression evaluating to the part to extract.
 * @param timezone - The timezone to use for extraction. Valid values are from
 * the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1."
 * @returns A new `Expression` representing the extracted part as an integer.
 */
export declare function timestampExtract(timestampExpression: Expression, part: Expression, timezone?: string | Expression): FunctionExpression;

/**
 *
 * Creates an expression that subtracts a specified amount of time from a timestamp.
 *
 * @example
 * ```typescript
 * // Subtract some duration determined by field 'unit' and 'amount' from the 'timestamp' field.
 * timestampSubtract(field("timestamp"), field("unit"), field("amount"));
 * ```
 *
 * @param timestamp - The expression representing the timestamp.
 * @param unit - The expression evaluates to unit of time, must be one of 'microsecond', 'millisecond', 'second', 'minute', 'hour', 'day'.
 * @param amount - The expression evaluates to amount of the unit.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the resulting timestamp.
 */
export declare function timestampSubtract(timestamp: Expression, unit: Expression, amount: Expression): FunctionExpression;

/**
 *
 * Creates an expression that subtracts a specified amount of time from a timestamp.
 *
 * @example
 * ```typescript
 * // Subtract 1 day from the 'timestamp' field.
 * timestampSubtract(field("timestamp"), "day", 1);
 * ```
 *
 * @param timestamp - The expression representing the timestamp.
 * @param unit - The unit of time to subtract (e.g., "day", "hour").
 * @param amount - The amount of time to subtract.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the resulting timestamp.
 */
export declare function timestampSubtract(timestamp: Expression, unit: TimeUnit, amount: number): FunctionExpression;

/**
 *
 * Creates an expression that subtracts a specified amount of time from a timestamp represented by a field.
 *
 * @example
 * ```typescript
 * // Subtract 1 day from the 'timestamp' field.
 * timestampSubtract("timestamp", "day", 1);
 * ```
 *
 * @param fieldName - The name of the field representing the timestamp.
 * @param unit - The unit of time to subtract (e.g., "day", "hour").
 * @param amount - The amount of time to subtract.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the resulting timestamp.
 */
export declare function timestampSubtract(fieldName: string, unit: TimeUnit, amount: number): FunctionExpression;

/**
 *
 * Creates an expression that converts a timestamp expression to the number of microseconds since the Unix epoch (1970-01-01 00:00:00 UTC).
 *
 * @example
 * ```typescript
 * // Convert the 'timestamp' field to microseconds since epoch.
 * timestampToUnixMicros(field("timestamp"));
 * ```
 *
 * @param expr - The expression representing the timestamp.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the number of microseconds since epoch.
 */
export declare function timestampToUnixMicros(expr: Expression): FunctionExpression;

/**
 *
 * Creates an expression that converts a timestamp field to the number of microseconds since the Unix epoch (1970-01-01 00:00:00 UTC).
 *
 * @example
 * ```typescript
 * // Convert the 'timestamp' field to microseconds since epoch.
 * timestampToUnixMicros("timestamp");
 * ```
 *
 * @param fieldName - The name of the field representing the timestamp.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the number of microseconds since epoch.
 */
export declare function timestampToUnixMicros(fieldName: string): FunctionExpression;

/**
 *
 * Creates an expression that converts a timestamp expression to the number of milliseconds since the Unix epoch (1970-01-01 00:00:00 UTC).
 *
 * @example
 * ```typescript
 * // Convert the 'timestamp' field to milliseconds since epoch.
 * timestampToUnixMillis(field("timestamp"));
 * ```
 *
 * @param expr - The expression representing the timestamp.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the number of milliseconds since epoch.
 */
export declare function timestampToUnixMillis(expr: Expression): FunctionExpression;

/**
 *
 * Creates an expression that converts a timestamp field to the number of milliseconds since the Unix epoch (1970-01-01 00:00:00 UTC).
 *
 * @example
 * ```typescript
 * // Convert the 'timestamp' field to milliseconds since epoch.
 * timestampToUnixMillis("timestamp");
 * ```
 *
 * @param fieldName - The name of the field representing the timestamp.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the number of milliseconds since epoch.
 */
export declare function timestampToUnixMillis(fieldName: string): FunctionExpression;

/**
 *
 * Creates an expression that converts a timestamp expression to the number of seconds since the Unix epoch (1970-01-01 00:00:00 UTC).
 *
 * @example
 * ```typescript
 * // Convert the 'timestamp' field to seconds since epoch.
 * timestampToUnixSeconds(field("timestamp"));
 * ```
 *
 * @param expr - The expression representing the timestamp.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the number of seconds since epoch.
 */
export declare function timestampToUnixSeconds(expr: Expression): FunctionExpression;

/**
 *
 * Creates an expression that converts a timestamp field to the number of seconds since the Unix epoch (1970-01-01 00:00:00 UTC).
 *
 * @example
 * ```typescript
 * // Convert the 'timestamp' field to seconds since epoch.
 * timestampToUnixSeconds("timestamp");
 * ```
 *
 * @param fieldName - The name of the field representing the timestamp.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the number of seconds since epoch.
 */
export declare function timestampToUnixSeconds(fieldName: string): FunctionExpression;

/**
 * Creates an expression that truncates a timestamp to a specified granularity.
 *
 * @example
 * ```typescript
 * // Truncate the 'createdAt' timestamp to the beginning of the day.
 * timestampTruncate('createdAt', 'day')
 * ```
 *
 * @param fieldName - Truncate the timestamp value contained in this field.
 * @param granularity - The granularity to truncate to.
 * @param timezone - The timezone to use for truncation. Valid values are from
 * the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1".
 * @returns A new `Expression` representing the truncated timestamp.
 */
export declare function timestampTruncate(fieldName: string, granularity: TimeGranularity, timezone?: string | Expression): FunctionExpression;

/**
 * Creates an expression that truncates a timestamp to a specified granularity.
 *
 * @example
 * ```typescript
 * // Truncate the 'createdAt' timestamp to the granularity specified in the field 'granularity'.
 * timestampTruncate('createdAt', field('granularity'))
 * ```
 *
 * @param fieldName - Truncate the timestamp value contained in this field.
 * @param granularity - The granularity to truncate to.
 * @param timezone - The timezone to use for truncation. Valid values are from
 * the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1".
 * @returns A new `Expression` representing the truncated timestamp.
 */
export declare function timestampTruncate(fieldName: string, granularity: Expression, timezone?: string | Expression): FunctionExpression;

/**
 * Creates an expression that truncates a timestamp to a specified granularity.
 *
 * @example
 * ```typescript
 * // Truncate the 'createdAt' timestamp to the beginning of the day.
 * timestampTruncate(field('createdAt'), 'day')
 * ```
 *
 * @param timestampExpression - Truncate the timestamp value that is returned by this expression.
 * @param granularity - The granularity to truncate to.
 * @param timezone - The timezone to use for truncation. Valid values are from
 * the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1".
 * @returns A new `Expression` representing the truncated timestamp.
 */
export declare function timestampTruncate(timestampExpression: Expression, granularity: TimeGranularity, timezone?: string | Expression): FunctionExpression;

/**
 * Creates an expression that truncates a timestamp to a specified granularity.
 *
 * @example
 * ```typescript
 * // Truncate the 'createdAt' timestamp to the granularity specified in the field 'granularity'.
 * timestampTruncate(field('createdAt'), field('granularity'))
 * ```
 *
 * @param timestampExpression - Truncate the timestamp value that is returned by this expression.
 * @param granularity - The granularity to truncate to.
 * @param timezone - The timezone to use for truncation. Valid values are from
 * the TZ database (e.g., "America/Los_Angeles") or in the format "Etc/GMT-1".
 * @returns A new `Expression` representing the truncated timestamp.
 */
export declare function timestampTruncate(timestampExpression: Expression, granularity: Expression, timezone?: string | Expression): FunctionExpression;

/**
 * Specify time units for expressions.
 */
export declare type TimeUnit = 'microsecond' | 'millisecond' | 'second' | 'minute' | 'hour' | 'day';

declare interface Token {
    /** Type of token. */
    type: TokenType;
    /**
     * The user with which the token is associated (used for persisting user
     * state on disk, etc.).
     * This will be null for Tokens of the type 'AppCheck'.
     */
    user?: User;
    /** Header values to set for this token */
    headers: Map<string, string>;
}

declare type TokenType = 'OAuth' | 'FirstParty' | 'AppCheck';

/**
 *
 * Creates an expression that converts a string field to lowercase.
 *
 * @example
 * ```typescript
 * // Convert the 'name' field to lowercase
 * toLower("name");
 * ```
 *
 * @param fieldName - The name of the field containing the string.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the lowercase string.
 */
export declare function toLower(fieldName: string): FunctionExpression;

/**
 *
 * Creates an expression that converts a string expression to lowercase.
 *
 * @example
 * ```typescript
 * // Convert the 'name' field to lowercase
 * toLower(field("name"));
 * ```
 *
 * @param stringExpression - The expression representing the string to convert to lowercase.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the lowercase string.
 */
export declare function toLower(stringExpression: Expression): FunctionExpression;

/**
 *
 * Creates an expression that converts a string field to uppercase.
 *
 * @example
 * ```typescript
 * // Convert the 'title' field to uppercase
 * toUpper("title");
 * ```
 *
 * @param fieldName - The name of the field containing the string.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the uppercase string.
 */
export declare function toUpper(fieldName: string): FunctionExpression;

/**
 *
 * Creates an expression that converts a string expression to uppercase.
 *
 * @example
 * ```typescript
 * // Convert the 'title' field to uppercase
 * toUpper(field("title"));
 * ```
 *
 * @param stringExpression - The expression representing the string to convert to uppercase.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the uppercase string.
 */
export declare function toUpper(stringExpression: Expression): FunctionExpression;

/** Used to represent a field transform on a mutation. */
declare class TransformOperation {
    private _;
}

/**
 *
 * Creates an expression that removes leading and trailing whitespace from a string or byte array.
 *
 * @example
 * ```typescript
 * // Trim whitespace from the 'userInput' field
 * trim("userInput");
 *
 * // Trim quotes from the 'userInput' field
 * trim("userInput", '"');
 * ```
 *
 * @param fieldName - The name of the field containing the string or byte array.
 * @param valueToTrim - Optional This parameter is treated as a set of characters or bytes that will be
 * trimmed from the input. If not specified, then whitespace will be trimmed.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the trimmed string.
 */
export declare function trim(fieldName: string, valueToTrim?: string | Expression): FunctionExpression;

/**
 *
 * Creates an expression that removes leading and trailing characters from a string or byte array expression.
 *
 * @example
 * ```typescript
 * // Trim whitespace from the 'userInput' field
 * trim(field("userInput"));
 *
 * // Trim quotes from the 'userInput' field
 * trim(field("userInput"), '"');
 * ```
 *
 * @param stringExpression - The expression representing the string or byte array to trim.
 * @param valueToTrim - Optional This parameter is treated as a set of characters or bytes that will be
 * trimmed from the input. If not specified, then whitespace will be trimmed.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the trimmed string or byte array.
 */
export declare function trim(stringExpression: Expression, valueToTrim?: string | Expression): FunctionExpression;

/**
 * Creates an expression that truncates the numeric value of a field to an integer.
 *
 * @example
 * ```typescript
 * // Truncate the value of the 'rating' field
 * trunc("rating");
 * ```
 *
 * @param fieldName - The name of the field containing the number to truncate.
 * @returns A new `Expression` representing the truncated value.
 */
export declare function trunc(fieldName: string): FunctionExpression;

/**
 * Creates an expression that truncates the numeric value of an expression to an integer.
 *
 * @example
 * ```typescript
 * // Truncate the value of the 'rating' field.
 * trunc(field("rating"));
 * ```
 *
 * @param expression - An expression evaluating to a numeric value, which will be truncated.
 * @returns A new `Expression` representing the truncated value.
 */
export declare function trunc(expression: Expression): FunctionExpression;

/**
 * Creates an expression that truncates a numeric expression to the specified number of decimal places.
 *
 * @example
 * ```typescript
 * // Truncate the value of the 'rating' field to two decimal places.
 * trunc("rating", 2);
 * ```
 *
 * @param fieldName - The name of the field to truncate.
 * @param decimalPlaces - A constant or expression specifying the truncation precision in decimal places.
 * @returns A new `Expression` representing the truncated value.
 */
export declare function trunc(fieldName: string, decimalPlaces: number | Expression): FunctionExpression;

/**
 * Creates an expression that truncates a numeric value to the specified number of decimal places.
 *
 * @example
 * ```typescript
 * // Truncate the value of the 'rating' field to two decimal places.
 * trunc(field("rating"), constant(2));
 * ```
 *
 * @param expression - An expression evaluating to a numeric value, which will be truncated.
 * @param decimalPlaces - A constant or expression specifying the truncation precision in decimal places.
 * @returns A new `Expression` representing the truncated value.
 */
export declare function trunc(expression: Expression, decimalPlaces: number | Expression): FunctionExpression;

/**
 * An association of JsonTypeDesc values to their native types.
 * @private
 * @internal
 */
declare type TSType<T extends JsonTypeDesc> = T extends 'object' ? object : T extends 'string' ? string : T extends 'number' ? number : T extends 'boolean' ? boolean : T extends 'null' ? null : T extends 'undefined' ? undefined : never;

/**
 * Creates an expression that returns the data type of the data in the specified field.
 *
 * @remarks
 * String inputs passed iteratively to this global function act as `field()` path lookups.
 * If you wish to pass a string literal value, it must be wrapped: `type(constant("my_string"))`.
 *
 * @example
 * ```typescript
 * // Get the data type of the value in field 'title'
 * type('title')
 * ```
 *
 * @returns A new `Expression` representing the data type.
 */
export declare function type(fieldName: string): FunctionExpression;

/**
 * Creates an expression that returns the data type of an expression's result.
 *
 * @example
 * ```typescript
 * // Get the data type of a conditional expression
 * type(conditional(exists('foo'), constant(1), constant(true)))
 * ```
 *
 * @returns A new `Expression` representing the data type.
 */
export declare function type(expression: Expression): FunctionExpression;

declare type UnaryFilterOp = 'OPERATOR_UNSPECIFIED' | 'IS_NAN' | 'IS_NULL' | 'IS_NOT_NAN' | 'IS_NOT_NULL';

/**
 * Options defining how a UnionStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(union:1)}.
 */
export declare type UnionStageOptions = StageOptions & {
    /**
     * Specifies the other Pipeline to union with.
     */
    other: Pipeline_2;
};

/**
 *
 * Creates an expression that interprets an expression as the number of microseconds since the Unix epoch (1970-01-01 00:00:00 UTC)
 * and returns a timestamp.
 *
 * @example
 * ```typescript
 * // Interpret the 'microseconds' field as microseconds since epoch.
 * unixMicrosToTimestamp(field("microseconds"));
 * ```
 *
 * @param expr - The expression representing the number of microseconds since epoch.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the timestamp.
 */
export declare function unixMicrosToTimestamp(expr: Expression): FunctionExpression;

/**
 *
 * Creates an expression that interprets a field's value as the number of microseconds since the Unix epoch (1970-01-01 00:00:00 UTC)
 * and returns a timestamp.
 *
 * @example
 * ```typescript
 * // Interpret the 'microseconds' field as microseconds since epoch.
 * unixMicrosToTimestamp("microseconds");
 * ```
 *
 * @param fieldName - The name of the field representing the number of microseconds since epoch.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the timestamp.
 */
export declare function unixMicrosToTimestamp(fieldName: string): FunctionExpression;

/**
 *
 * Creates an expression that interprets an expression as the number of milliseconds since the Unix epoch (1970-01-01 00:00:00 UTC)
 * and returns a timestamp.
 *
 * @example
 * ```typescript
 * // Interpret the 'milliseconds' field as milliseconds since epoch.
 * unixMillisToTimestamp(field("milliseconds"));
 * ```
 *
 * @param expr - The expression representing the number of milliseconds since epoch.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the timestamp.
 */
export declare function unixMillisToTimestamp(expr: Expression): FunctionExpression;

/**
 *
 * Creates an expression that interprets a field's value as the number of milliseconds since the Unix epoch (1970-01-01 00:00:00 UTC)
 * and returns a timestamp.
 *
 * @example
 * ```typescript
 * // Interpret the 'milliseconds' field as milliseconds since epoch.
 * unixMillisToTimestamp("milliseconds");
 * ```
 *
 * @param fieldName - The name of the field representing the number of milliseconds since epoch.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the timestamp.
 */
export declare function unixMillisToTimestamp(fieldName: string): FunctionExpression;

/**
 *
 * Creates an expression that interprets an expression as the number of seconds since the Unix epoch (1970-01-01 00:00:00 UTC)
 * and returns a timestamp.
 *
 * @example
 * ```typescript
 * // Interpret the 'seconds' field as seconds since epoch.
 * unixSecondsToTimestamp(field("seconds"));
 * ```
 *
 * @param expr - The expression representing the number of seconds since epoch.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the timestamp.
 */
export declare function unixSecondsToTimestamp(expr: Expression): FunctionExpression;

/**
 *
 * Creates an expression that interprets a field's value as the number of seconds since the Unix epoch (1970-01-01 00:00:00 UTC)
 * and returns a timestamp.
 *
 * @example
 * ```typescript
 * // Interpret the 'seconds' field as seconds since epoch.
 * unixSecondsToTimestamp("seconds");
 * ```
 *
 * @param fieldName - The name of the field representing the number of seconds since epoch.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the timestamp.
 */
export declare function unixSecondsToTimestamp(fieldName: string): FunctionExpression;

/**
 * Represents the specific options available for configuring an `UnnestStage` within a pipeline.
 */
export declare type UnnestStageOptions = StageOptions & {
    /**
     * A `Selectable` object that defines an array expression to be un-nested
     * and the alias for the un-nested field.
     */
    selectable: Selectable;
    /**
     * If set, specifies the field on the output documents that will contain the
     * offset (starting at zero) that the element is from the original array.
     */
    indexField?: string;
};

/**
 * A function returned by `onSnapshot()` that removes the listener when invoked.
 */
export declare interface Unsubscribe {
    /** Removes the listener when invoked. */
    (): void;
}

/**
 * An untyped Firestore Data Converter interface that is shared between the
 * lite, firestore-exp and classic SDK.
 */
declare interface UntypedFirestoreDataConverter<AppModelType, DbModelType extends DocumentData_2 = DocumentData_2> {
    toFirestore(modelObject: WithFieldValue<AppModelType>): WithFieldValue<DbModelType>;
    toFirestore(modelObject: PartialWithFieldValue<AppModelType>, options: SetOptions_2): PartialWithFieldValue<DbModelType>;
    fromFirestore(snapshot: unknown, options?: unknown): AppModelType;
}

/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Simple wrapper around a nullable UID. Mostly exists to make code more
 * readable.
 */
declare class User {
    readonly uid: string | null;
    /** A user with a null UID. */
    static readonly UNAUTHENTICATED: User;
    static readonly GOOGLE_CREDENTIALS: User;
    static readonly FIRST_PARTY: User;
    static readonly MOCK_USER: User;
    constructor(uid: string | null);
    isAuthenticated(): boolean;
    /**
     * Returns a key representing this user, suitable for inclusion in a
     * dictionary.
     */
    toKey(): string;
    isEqual(otherUser: User): boolean;
}

declare interface UserData {
    _readUserData(context: ParseContext): void;
}

/**
 * Helper for parsing raw user input (provided via the API) into internal model
 * classes.
 */
declare class UserDataReader {
    private readonly databaseId;
    private readonly ignoreUndefinedProperties;
    readonly serializer: JsonProtoSerializer;
    constructor(databaseId: DatabaseId, ignoreUndefinedProperties: boolean, serializer?: JsonProtoSerializer);
    /** Creates a new top-level parse context. */
    createContext(dataSource: UserDataSource, methodName: string, targetDoc?: DocumentKey, hasConverter?: boolean): ParseContextImpl;
}

declare const enum UserDataSource {
    Set = 0,
    Update = 1,
    MergeSet = 2,
    /**
     * Indicates the source is a where clause, cursor bound, arrayUnion()
     * element, etc. Of note, isWrite(source) will return false.
     */
    Argument = 3,
    /**
     * Indicates that the source is an Argument that may directly contain nested
     * arrays (e.g. the operand of an `in` query).
     */
    ArrayArgument = 4
}

declare type Value = firestoreV1ApiClientInterfaces.Value;

declare type ValueNullValue = 'NULL_VALUE';

/**
 * @public
 * Creates an expression that retrieves the value of a variable bound via `define()`.
 *
 * @example
 * ```typescript
 * db.pipeline().collection("products")
 *   .define(
 *     field("price").multiply(0.9).as("discountedPrice"),
 *     field("stock").add(10).as("newStock")
 *   )
 *   .where(variable("discountedPrice").lessThan(100))
 *   .select(field("name"), variable("newStock"));
 * ```
 *
 * @param name - The name of the variable to retrieve.
 * @returns An {@link @firebase/firestore/pipelines#Expression} representing the variable's value.
 */
export declare function variable(name: string): Expression;

/**
 *
 * Creates an expression that calculates the length of a Firestore Vector.
 *
 * @example
 * ```typescript
 * // Get the vector length (dimension) of the field 'embedding'.
 * vectorLength(field("embedding"));
 * ```
 *
 * @param vectorExpression - The expression representing the Firestore Vector.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the length of the array.
 */
export declare function vectorLength(vectorExpression: Expression): FunctionExpression;

/**
 *
 * Creates an expression that calculates the length of a Firestore Vector represented by a field.
 *
 * @example
 * ```typescript
 * // Get the vector length (dimension) of the field 'embedding'.
 * vectorLength("embedding");
 * ```
 *
 * @param fieldName - The name of the field representing the Firestore Vector.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the length of the array.
 */
export declare function vectorLength(fieldName: string): FunctionExpression;

/**
 * Represents a vector type in Firestore documents.
 * Create an instance with <code>{@link vector}</code>.
 */
export declare class VectorValue {
    private readonly _values;
    /**
     * @private
     * @internal
     */
    constructor(values: number[] | undefined);
    /**
     * Returns a copy of the raw number array form of the vector.
     */
    toArray(): number[];
    /**
     * Returns `true` if the two `VectorValue` values have the same raw number arrays, returns `false` otherwise.
     */
    isEqual(other: VectorValue): boolean;
    static _jsonSchemaVersion: string;
    static _jsonSchema: {
        type: Property<"string">;
        vectorValues: Property<"object">;
    };
    /**
     * Returns a JSON-serializable representation of this `VectorValue` instance.
     *
     * @returns a JSON representation of this object.
     */
    toJSON(): object;
    /**
     * Builds a `VectorValue` instance from a JSON object created by {@link VectorValue.toJSON}.
     *
     * @param json - a JSON object represention of a `VectorValue` instance.
     * @returns an instance of {@link VectorValue} if the JSON object could be parsed. Throws a
     * {@link FirestoreError} if an error occurs.
     */
    static fromJSON(json: object): VectorValue;
}

declare class ViewSnapshot {
    readonly query: QueryOrPipeline;
    readonly docs: DocumentSet;
    readonly oldDocs: DocumentSet;
    readonly docChanges: DocumentViewChange[];
    readonly mutatedKeys: DocumentKeySet;
    readonly fromCache: boolean;
    readonly syncStateChanged: boolean;
    readonly excludesMetadataChanges: boolean;
    readonly hasCachedResults: boolean;
    constructor(query: QueryOrPipeline, docs: DocumentSet, oldDocs: DocumentSet, docChanges: DocumentViewChange[], mutatedKeys: DocumentKeySet, fromCache: boolean, syncStateChanged: boolean, excludesMetadataChanges: boolean, hasCachedResults: boolean);
    /** Returns a view snapshot as if all documents in the snapshot were added. */
    static fromInitialDocuments(query: QueryOrPipeline, documents: DocumentSet, mutatedKeys: DocumentKeySet, fromCache: boolean, hasCachedResults: boolean): ViewSnapshot;
    get hasPendingWrites(): boolean;
    isEqual(other: ViewSnapshot): boolean;
}

/**
 * Options defining how a WhereStage is evaluated. See {@link @firebase/firestore/pipelines#Pipeline.(where:1)}.
 */
export declare type WhereStageOptions = StageOptions & {
    /**
     * The {@link @firebase/firestore/pipelines#BooleanExpression} to apply as a filter for each input document to this stage.
     */
    condition: BooleanExpression;
};

/**
 * Allows FieldValues to be passed in as a property value while maintaining
 * type safety.
 */
export declare type WithFieldValue<T> = T | (T extends Primitive ? T : T extends {} ? {
    [K in keyof T]: WithFieldValue<T[K]> | FieldValue;
} : never);

/**
 *
 * Creates an expression that performs a logical 'XOR' (exclusive OR) operation on multiple BooleanExpressions.
 *
 * @example
 * ```typescript
 * // Check if only one of the conditions is true: 'age' greater than 18, 'city' is "London",
 * // or 'status' is "active".
 * const condition = xor(
 *     greaterThan("age", 18),
 *     equal("city", "London"),
 *     equal("status", "active"));
 * ```
 *
 * @param first - The first condition.
 * @param second - The second condition.
 * @param additionalConditions - Additional conditions to 'XOR' together.
 * @returns A new {@link @firebase/firestore/pipelines#Expression} representing the logical 'XOR' operation.
 */
export declare function xor(first: BooleanExpression, second: BooleanExpression, ...additionalConditions: BooleanExpression[]): BooleanExpression;

export { }
