import { MutableRefObject } from 'react';
/** Flavor of useRef with lazy initialization. */
export declare function useLazyRef<T>(factory: () => T): MutableRefObject<T>;
/** Returns a stable constant that will be initialized on the first render. */
export declare function useConstant<T>(factory: () => T): T;
/** Returns a setTimeout-like function that clears the previous timeout when re-invoked or when the component unmounts. */
export declare function useTimeout(): [(handler: () => void, timeout?: number) => void, () => void];