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<?php declare(strict_types=1);
* This file is part of Evenement.
* (c) Igor Wiedler <>
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
namespace Evenement;
interface EventEmitterInterface
public function on($event, callable $listener);
public function onceBefore($event, callable $listener);
public function once($event, callable $listener);
public function removeListener($event, callable $listener);
public function removeAllListeners($event = null);
public function listeners($event = null);
public function emit($event, array $arguments = []);
public function forward(EventEmitterInterface $emitter);