YamlDirectoryDiscovery.php

<?php

namespace Drupal\Core\Plugin\Discovery;

use Drupal\Component\Discovery\YamlDirectoryDiscovery as ComponentYamlDirectoryDiscovery;

/**
 * Allows multiple YAML files per directory to define plugin definitions.
 */
class YamlDirectoryDiscovery extends YamlDiscovery {
    
    /**
     * Constructs a YamlDirectoryDiscovery object.
     *
     * @param array $directories
     *   An array of directories to scan, keyed by the provider. The value can
     *   either be a string or an array of strings. The string values should be
     *   the path of a directory to scan.
     * @param string $file_cache_key_suffix
     *   The file cache key suffix. This should be unique for each type of
     *   discovery.
     * @param string $key
     *   (optional) The key contained in the discovered data that identifies it.
     *   Defaults to 'id'.
     */
    public function __construct(array $directories, $file_cache_key_suffix, $key = 'id') {
        // Intentionally does not call parent constructor as this class uses a
        // different YAML discovery.
        $this->discovery = new ComponentYamlDirectoryDiscovery($directories, $file_cache_key_suffix, $key);
    }

}