src/Adapter/Stk2kEventChannelAdapter.php
public function listen(string $event, callable $callback) : EventChannelInterface
    {
        $this->channel->listen($event, $callback);
        return $this;
    }
public function listen(string $event, callable $callback) : EventChannelInterface
    {
        $this->channel->listen($event, $callback);
        return $this;
    }
Subscribe to event channel

@param string $event
@param callable $callback

@return EventChannelInterface