/**
 * @license
 * Copyright 2019 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 { Installations } from '../interfaces/public-types';
/**
 * Creates a Firebase Installation if there isn't one for the app and
 * returns the Installation ID.
 * @param installations - The `Installations` instance.
 *
 * @public
 */
export declare function getId(installations: Installations): Promise<string>;