Function onTransitionEnd

core/src/utils/helpers.ts:36–41

(ev?: Event)

  };

  const onTransitionEnd = (ev?: Event) => {
    if (ev === undefined || el === ev.target) {
      unregister();
      callback(ev as TransitionEvent);
    }
  };

  if (el) {
    el.addEventListener('webkitTransitionEnd', onTransitionEnd, opts);