/**
* Calls all handlers associated with an event group.
*
* This is a legacy method, implementing old-style (Joomla! 3.x) plugin calls. It's best to go directly through the
* Dispatcher and handle the returned EventInterface object instead of going through this method. This method is
* deprecated and will be removed in Joomla! 5.x.
*
* This method will only return the 'result' argument of the event
*
* @param string $eventName The event name.
* @param array|Event $args An array of arguments or an Event object (optional).
*
* @return array An array of results from each function call. Note this will be an empty array if no dispatcher is set.
*
* @since 4.0.0
* @throws \InvalidArgumentException
* @deprecated 5.0
*/
public function triggerEvent($eventName, $args = []);