src/Valkyrja/Events/NativeEvents.php
public function hasListener(string $event, string $listenerId): bool
    {
        return $this->has($event) && isset(self::$events[$event][$listenerId]);
    }
public function hasListener(string $event, string $listenerId): bool
    {
        return $this->has($event) && isset(self::$events[$event][$listenerId]);
    }
Determine whether an event has a specified listener.

@param string $event      The event
@param string $listenerId The event listener

@return bool