Function tick

src/js/tether.js:88–111

()

  let pendingTimeout = null;

  const tick = () => {
    if (!isUndefined(lastDuration) && lastDuration > 16) {
      // We voluntarily throttle ourselves if we can't manage 60fps
      lastDuration = Math.min(lastDuration - 16, 250);

      // Just in case this is the last event, remember to position just once more
      pendingTimeout = setTimeout(tick, 250);
      return;
    }

    if (!isUndefined(lastCall) && now() - lastCall < 10) {
      // Some browsers call events a little too frequently, refuse to run more than is reasonable
      return;
    }

    if (pendingTimeout != null) {
      clearTimeout(pendingTimeout);
      pendingTimeout = null;
    }

    lastCall = now();
    position();
    lastDuration = now() - lastCall;
  };

  if (typeof window !== 'undefined' && !isUndefined(window.addEventListener)) {
    ['resize', 'scroll', 'touchmove'].forEach((event) => {