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.
Type: array
protected $directories = [];
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https://api.drupal.org/api/drupal/core!lib!Drupal!Component!Discovery!YamlDirectoryDiscovery.php/property/YamlDirectoryDiscovery::directories/8.1.x