/**
 * @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.
 */
import { FirebaseApp } from '@firebase/app-exp';
import { FirebaseAuthInternalName } from '@firebase/auth-interop-types';
import { Provider } from '@firebase/component';
import { EmulatorMockTokenOptions } from '@firebase/util';
import { CredentialsProvider } from '../api/credentials';
import { DatabaseId } from '../core/database_info';
import { FirestoreService } from './components';
import { FirestoreSettings, PrivateSettings, Settings } from './settings';
declare module '@firebase/component' {
    interface NameServiceMapping {
        'firestore/lite': FirebaseFirestore;
    }
}
/**
 * The Cloud Firestore service interface.
 *
 * Do not call this constructor directly. Instead, use {@link getFirestore}.
 */
export declare class FirebaseFirestore implements FirestoreService {
    type: 'firestore-lite' | 'firestore';
    readonly _databaseId: DatabaseId;
    readonly _persistenceKey: string;
    _credentials: CredentialsProvider;
    private _settings;
    private _settingsFrozen;
    private _terminateTask?;
    _app?: FirebaseApp;
    /** @hideconstructor */
    constructor(databaseIdOrApp: DatabaseId | FirebaseApp, authProvider: Provider<FirebaseAuthInternalName>);
    /**
     * 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(): FirestoreSettings;
    _freezeSettings(): FirestoreSettings;
    _delete(): 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>;
}
/**
 * Initializes a new instance of Cloud Firestore with the provided settings.
 * Can only be called before any other functions, including
 * {@link getFirestore}. If the custom settings are empty, this function is
 * equivalent to calling {@link getFirestore}.
 *
 * @param app - The {@link @firebase/app#FirebaseApp} with which the `Firestore` instance will
 * be associated.
 * @param settings - A settings object to configure the `Firestore` instance.
 * @returns A newly initialized Firestore instance.
 */
export declare function initializeFirestore(app: FirebaseApp, settings: Settings): FirebaseFirestore;
/**
 * Returns the existing instance of Firestore that is associated with the
 * provided {@link @firebase/app#FirebaseApp}. If no instance exists, initializes a new
 * instance with default settings.
 *
 * @param app - The {@link @firebase/app#FirebaseApp} instance that the returned Firestore
 * instance is associated with.
 * @returns The `Firestore` instance of the provided app.
 */
export declare function getFirestore(app?: FirebaseApp): FirebaseFirestore;
/**
 * Modify this instance to communicate with the Cloud Firestore emulator.
 *
 * Note: This must be called before this instance has been used to do any
 * operations.
 *
 * @param firestore - The Firestore instance to configure to connect to the
 * emulator.
 * @param host - the emulator host (ex: localhost).
 * @param port - the emulator port (ex: 9000).
 * @param options.mockUserToken - the mock auth token to use for unit testing
 * Security Rules.
 */
export declare function useFirestoreEmulator(firestore: FirebaseFirestore, host: string, port: number, options?: {
    mockUserToken?: EmulatorMockTokenOptions;
}): void;
/**
 * Terminates the provided Firestore instance.
 *
 * After calling `terminate()` only the `clearIndexedDbPersistence()` functions
 * may be used. Any other function will throw a `FirestoreError`. Termination
 * does not cancel any pending writes, and any promises that are awaiting a
 * response from the server will not be resolved.
 *
 * To restart after termination, create a new instance of FirebaseFirestore with
 * {@link getFirestore}.
 *
 * Note: Under normal circumstances, calling `terminate()` is not required. This
 * function is useful only when you want to force this instance to release all of
 * its resources or in combination with {@link clearIndexedDbPersistence} to
 * ensure that all local state is destroyed between test runs.
 *
 * @param firestore - The Firestore instance to terminate.
 * @returns A promise that is resolved when the instance has been successfully
 * terminated.
 */
export declare function terminate(firestore: FirebaseFirestore): Promise<void>;
