/**
 * A React hook that monitors the DOM for the addition of a div with id "headlessui-portal-root"
 * and adds a specified className to it. It handles both initial presence and dynamic additions.
 *
 * @param {string} portalId - ID of the portal root div.
 * @param {string} className - The class name to add to the portal root div.
 */
export declare function useAddClassToPortal(portalIds: string[], className: string): void;
