/**
 * @license
 * Copyright 2017 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.
 */
/**
 * @param {string} str
 * @return {Array}
 */
export declare const stringToByteArray: (str: string) => number[];
/**
 * Calculate length without actually converting; useful for doing cheaper validation.
 * @param {string} str
 * @return {number}
 */
export declare const stringLength: (str: string) => number;