symfony/src/Symfony/Bundle/FrameworkBundle/Resources/skeleton/bundle/Bundle.php

<?php

namespace {{ namespace }}\{{ bundle }};

use Symfony\Framework\Bundle\Bundle;
use Symfony\Components\DependencyInjection\ContainerInterface;
use Symfony\Components\DependencyInjection\ParameterBag\ParameterBagInterface;

class {{ bundle }} extends Bundle
{
}