/**
 * Check the presence of query parameter in the current page URL.
 */
export declare function isQueryParamPresent(queryParam: string): boolean;
/**
 * Watches for changes in the presence of a query parameter in the URL and calls a callback when it changes.
 */
export declare const watchQueryParamPresence: (queryParam: string, onChange: (isPresent: boolean) => void) => (() => void);