6 files declare their use of YamlDirectoryDiscovery

ComponentLoader.php in core/lib/Drupal/Core/Template/Loader/ComponentLoader.php
ComponentPluginManager.php in core/lib/Drupal/Core/Theme/ComponentPluginManager.php
DirectoryWithMetadataDiscovery.php in core/lib/Drupal/Core/Plugin/Discovery/DirectoryWithMetadataDiscovery.php
YamlDirectoryDiscovery.php in core/lib/Drupal/Core/Plugin/Discovery/YamlDirectoryDiscovery.php
YamlDirectoryDiscoveryTest.php in core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDirectoryDiscoveryTest.php
YamlDirectoryDiscoveryTest.php in core/tests/Drupal/Tests/Component/Discovery/YamlDirectoryDiscoveryTest.php

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