Function scheduleCallbackWithRafRace

packages/core/src/util/callback_scheduler.ts:37–66

(callback: Function)

 * @returns a function to cancel the scheduled callback
 */
export function scheduleCallbackWithRafRace(callback: Function): () => void {
  let timeoutId: number;
  let animationFrameId: number;
  function cleanup() {
    callback = noop;
    try {
      if (animationFrameId !== undefined && typeof cancelAnimationFrame === 'function') {
        cancelAnimationFrame(animationFrameId);
      }
      if (timeoutId !== undefined) {
        clearTimeout(timeoutId);
      }
    } catch {
      // Clearing/canceling can fail in tests due to the timing of functions being patched and unpatched
      // Just ignore the errors - we protect ourselves from this issue by also making the callback a no-op.
    }
  }
  timeoutId = setTimeout(() => {
    callback();
    cleanup();
  }) as unknown as number;
  if (typeof requestAnimationFrame === 'function') {
    animationFrameId = requestAnimationFrame(() => {
      callback();
      cleanup();
    });
  }

  return () => cleanup();
}

export function scheduleCallbackWithMicrotask(callback: Function): () => void {
  queueMicrotask(() => callback());