Function trackTimer

im/im.ts:105–109

(timer: ReturnType<typeof setTimeout>)

function trackTimer(timer: ReturnType<typeof setTimeout>): ReturnType<typeof setTimeout> {
  pendingTimers.add(timer);
  timer.unref?.(); // Don't prevent process exit
  return timer;
}

function clearTrackedTimer(timer: ReturnType<typeof setTimeout>): void {
  clearTimeout(timer);
  pendingTimers.delete(timer);