/**
 * Returns the query string part of the URL.
 *
 * @param url The full URL.
 *
 * @example
 * ```js
 * const queryString = getQueryString( 'http://localhost:8080/this/is/a/test?query=true#fragment' ); // 'query=true'
 * ```
 *
 * @return The query string part of the URL.
 */
export declare function getQueryString(url: string): string | void;
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