/**
 * 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.
 */
export declare function normalize<T = {}, U = Function>(optionsOrCallback?: T | U, cb?: U): {
    options: T;
    callback: U;
};
/**
 * Flatten an object into an Array of arrays, [[key, value], ..].
 * Implements Object.entries() for Node.js <8
 * @internal
 */
export declare function objectEntries<T>(obj: {
    [key: string]: T;
}): Array<[string, T]>;
