https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Plugin%21Discovery%21DirectoryWithMetadataDiscovery.php/10
DirectoryWithMetadataDiscovery.php | Drupal API
phpdrupalapi
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Plugin%21Discovery%21DirectoryWithMetadataDiscovery.php/class/DirectoryWithMetadataDiscovery/10
class DirectoryWithMetadataDiscovery | Drupal API
classdrupalapi