import { type RefObject } from 'react';
/**
 * Returns a stable ref that becomes `true` after the component unmounts.
 *
 * The initial value is `false`, including during server rendering. The effect
 * setup explicitly restores `false` so React StrictMode's development-only
 * cleanup and re-setup cycle does not leave a live component marked unmounted.
 *
 * @returns A stable ref whose current value indicates unmount status.
 * @public
 */
export declare function useUnmountedRef(): RefObject<boolean>;