getEmptyInstance example

    public function dispatchEvent($eventName, EventArgs $eventArgs = null): void
    {
        if (!$this->initializedSubscribers) {
            $this->initializeSubscribers();
        }
        if (!isset($this->listeners[$eventName])) {
            return;
        }

        $eventArgs ??= EventArgs::getEmptyInstance();

        if (!isset($this->initialized[$eventName])) {
            $this->initializeListeners($eventName);
        }

        foreach ($this->listeners[$eventName] as $hash => $listener) {
            $listener->{$this->methods[$eventName][$hash]}($eventArgs);
        }
    }

    public function getListeners($event = null): array
    {