/**
  * Constructor.
  *
  * @param array           $repoConfig
  * @param IOInterface     $io
  * @param Config          $config
  * @param EventDispatcher $eventDispatcher
  */
 public function __construct(array $repoConfig, IOInterface $io, Config $config, EventDispatcher $eventDispatcher = null)
 {
     $this->url = isset($repoConfig['private-registry-url']) ? $repoConfig['private-registry-url'] : null;
     parent::__construct($repoConfig, $io, $config, $eventDispatcher);
 }