@wordpress/url/src/get-query-string.js

WordPress URL utilities.

/**
 * Returns the query string part of the URL.
 *
 * @param {string} url The full URL.
 *
 * @example
 * ```js
 * const queryString = getQueryString( 'http://localhost:8080/this/is/a/test?query=true#fragment' ); // 'query=true'
 * ```
 *
 * @return {string|void} The query string part of the URL.
 */
export function getQueryString( url ) {
	let query;
	try {
		query = new URL( url ).search.substring( 1 );
	} catch ( error ) {}

	if ( query ) {
		return query;
	}
}