/*! firebase-admin v13.2.0 */
/*!
 * Copyright 2020 Google Inc.
 *
 * 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 { Message } from './messaging-api';
export declare const BLACKLISTED_DATA_PAYLOAD_KEYS: string[];
export declare const BLACKLISTED_OPTIONS_KEYS: string[];
/**
 * Checks if the given Message object is valid. Recursively validates all the child objects
 * included in the message (android, apns, data etc.). If successful, transforms the message
 * in place by renaming the keys to what's expected by the remote FCM service.
 *
 * @param {Message} Message An object to be validated.
 */
export declare function validateMessage(message: Message): void;