/**
 * A hook for subscribing to a value.
 * @example
 * const { subscribe, notify } = useSubscribe<number>();
 * subscribe((value) => console.log(value));
 * notify(1);
 *
 * @returns A tuple of `subscribe` and `notify` functions.
 */
export declare function useSubscribe<T>(): {
    subscribe: (fn: (value: T) => void) => () => boolean;
    notify: (value: T) => void;
};