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    <h3>Editing: AddEventAliasesPass.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\EventDispatcher\DependencyInjection;

use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;

/**
 * This pass allows bundles to extend the list of event aliases.
 *
 * @author Alexander M. Turek &lt;me@derrabus.de&gt;
 */
class AddEventAliasesPass implements CompilerPassInterface
{
    private array $eventAliases;

    public function __construct(array $eventAliases)
    {
        $this-&gt;eventAliases = $eventAliases;
    }

    public function process(ContainerBuilder $container): void
    {
        $eventAliases = $container-&gt;hasParameter('event_dispatcher.event_aliases') ? $container-&gt;getParameter('event_dispatcher.event_aliases') : [];

        $container-&gt;setParameter(
            'event_dispatcher.event_aliases',
            array_merge($eventAliases, $this-&gt;eventAliases)
        );
    }
}
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