/**
 * Determines whether the URL contains a given query arg.
 *
 * @param url URL.
 * @param arg Query arg name.
 *
 * @example
 * ```js
 * const hasBar = hasQueryArg( 'https://wordpress.org?foo=bar&bar=baz', 'bar' ); // true
 * ```
 *
 * @return Whether or not the URL contains the query arg.
 */
export declare function hasQueryArg(url: string, arg: string): boolean;
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