code: public function register(Container $app)
      {
          $configDirectories = [$app['app.config.dir']];
          $locator = new FileLocator($configDirectories);
  
          // Loads routes files
          $app['config.loader'] = function ($app) use ($locator) {
              // load only *.yml files?
              $loader =  new YamlFileLoader($locator);
              return $loader;
          };
  
          // Finds files or directories
          $app['config.finder'] = function () {
              return new Finder();
          };
  
          // Parses yaml files
          $app['config.parser'] = function () {
              return new Parser();
          };
      }
docs: {@inheritdoc}