/**
 * @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.
 */
/**
 * Returns a querystring-formatted string (e.g. &arg=val&arg2=val2) from a
 * params object (e.g. {arg: 'val', arg2: 'val2'})
 * Note: You must prepend it with ? when adding it to a URL.
 */
export declare function querystring(querystringParams: {
    [key: string]: string | number;
}): string;
/**
 * Decodes a querystring (e.g. ?arg=val&arg2=val2) into a params object
 * (e.g. {arg: 'val', arg2: 'val2'})
 */
export declare function querystringDecode(querystring: string): Record<string, string>;
/**
 * Extract the query string part of a URL, including the leading question mark (if present).
 */
export declare function extractQuerystring(url: string): string;