/**
 * Hook that returns whether the component is currently mounted
 *
 * @returns True if component is mounted, false otherwise
 *
 * @example
 * ```tsx
 * const Component = () => {
 *   const isMounted = useMountedState();
 *   const [data, setData] = useState(null);
 *
 *   useEffect(() => {
 *     fetchData().then((result) => {
 *       if (isMounted()) {
 *         setData(result);
 *       }
 *     });
 *   }, []);
 * };
 * ```
 */
export declare function useMountedState(): () => boolean;
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