import type { DOMElement } from '../dom.js';
/**
 * Hook for synchronized animations that pause when offscreen.
 *
 * Returns a ref to attach to the animated element and the current animation time.
 * All instances share the same clock, so animations stay in sync.
 * The clock only runs when at least one keepAlive subscriber exists.
 *
 * Pass `null` to pause — unsubscribes from the clock so no ticks fire.
 * Time freezes at the last value and resumes from the current clock time
 * when a number is passed again.
 *
 * @param intervalMs - How often to update, or null to pause
 * @returns [ref, time] - Ref to attach to element, elapsed time in ms
 */
export declare function useAnimationFrame(intervalMs?: number | null): [ref: (element: DOMElement | null) => void, time: number];
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