/**
 * A hook that provides a way to run a function at regular intervals.
 * Automatically handles cleanup and can be paused/resumed.
 *
 * @param callback - The function to call on each interval
 * @param delay - The delay between calls in milliseconds (null to pause)
 *
 * @example
 * ```tsx
 * const [count, setCount] = useState(0)
 * const [isRunning, setIsRunning] = useState(true)
 *
 * useInterval(
 *   () => setCount(c => c + 1),
 *   isRunning ? 1000 : null
 * )
 *
 * return (
 *   <div>
 *     Count: {count}
 *     <button onClick={() => setIsRunning(!isRunning)}>
 *       {isRunning ? 'Pause' : 'Resume'}
 *     </button>
 *   </div>
 * )
 * ```
 */
export declare function useInterval(callback: () => void, delay: number | null): void;
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