/**
 * Hook that runs a callback after a specified delay
 *
 * @param callback - Function to call after delay
 * @param delay - Delay in milliseconds (null to cancel)
 *
 * @example
 * ```tsx
 * const Component = () => {
 *   const [show, setShow] = useState(false);
 *   useTimeout(() => setShow(true), 1000);
 *   return <div>{show ? 'Shown' : 'Hidden'}</div>;
 * };
 * ```
 */
export declare function useTimeout(callback: () => void, delay: number | null): void;
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