/**
  * @param PackageEvent $event
  *
  * Can be added as post-install-cmd in composer.json
  */
 public static function registerBundle(PackageEvent $event)
 {
     $package = $event->getOperation()->getPackage();
     if ('symfony-bundle' === $package->getType()) {
         self::registerWithPackage($package, $output = $event->getIo());
     }
 }