/**
 * @license
 * Copyright 2018 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 { Observable } from 'rxjs';
import { DocumentReference, DocumentData, SnapshotListenOptions, Query, DocumentSnapshot, QuerySnapshot } from './interfaces';
export declare function fromRef<T = DocumentData>(ref: DocumentReference<T>, options?: SnapshotListenOptions): Observable<DocumentSnapshot<T>>;
export declare function fromRef<T = DocumentData>(ref: Query<T>, options?: SnapshotListenOptions): Observable<QuerySnapshot<T>>;