Function isMouseSpecialEvent

packages/core/primitives/event-dispatch/src/event.ts:388–399

(e: Event, type: string, element: Element)

 * @return True if the event is a mouseenter/mouseleave event.
 */
export function isMouseSpecialEvent(e: Event, type: string, element: Element): boolean {
  // `relatedTarget` is an old DOM API.
  const related = (e as any).relatedTarget as Node;

  return (
    ((e.type === EventType.MOUSEOVER && type === EventType.MOUSEENTER) ||
      (e.type === EventType.MOUSEOUT && type === EventType.MOUSELEAVE) ||
      (e.type === EventType.POINTEROVER && type === EventType.POINTERENTER) ||
      (e.type === EventType.POINTEROUT && type === EventType.POINTERLEAVE)) &&
    (!related || (related !== element && !element.contains(related)))
  );
}

/**
 * Creates a new EventLike object for a mouseenter/mouseleave event that's