/**
 * @file useIsMounted Hook
 * @description Utility hook to track component mounted state and prevent updates after unmount
 *
 * This hook is essential for preventing memory leaks and "Can't perform a React state update
 * on an unmounted component" warnings. Use it to guard async operations and state updates.
 *
 * @example
 * ```tsx
 * function DataFetcher() {
 *   const isMounted = useIsMounted();
 *   const [data, setData] = useState(null);
 *
 *   useEffect(() => {
 *     fetchData().then(result => {
 *       if (isMounted()) {
 *         setData(result);
 *       }
 *     });
 *   }, [isMounted]);
 *
 *   return <div>{data}</div>;
 * }
 * ```
 */
/**
 * Hook to track if component is currently mounted
 *
 * Returns a function that returns true if the component is still mounted.
 * This is useful for preventing state updates on unmounted components.
 *
 * @returns Function that returns true if component is mounted
 */
export declare function useIsMounted(): () => boolean;
/**
 * Hook that provides both a check function and a guard wrapper
 *
 * @example
 * ```tsx
 * const { isMounted, ifMounted } = useMountedState();
 *
 * // Direct check
 * if (isMounted()) {
 *   setState(value);
 * }
 *
 * // Guard wrapper
 * ifMounted(() => setState(value));
 * ```
 */
export declare function useMountedState(): {
    isMounted: () => boolean;
    ifMounted: <T>(fn: () => T) => T | undefined;
};