/***
 * A custom hook that keeps track of whether a component is currently mounted.
 *
 * This hook returns a function that can be called to determine if the component
 * is still mounted. This is useful for preventing memory leaks and ensuring that
 * state updates or callbacks are only executed when the component is mounted.
 *
 * @returns {() => boolean} A callback function that returns `true` if the
 * component is mounted, and `false` otherwise.
 */
export default function useIsMounted(): () => boolean;