/** * {@inheritdoc} */ public function getAttachableAssetLibraries(LibraryInterface $library, LibraryManagerInterface $library_manager) { assert('$library instanceof \\Drupal\\libraries\\ExternalLibrary\\Asset\\AssetLibraryInterface'); /** @var \Drupal\libraries\ExternalLibrary\Asset\AssetLibraryInterface $library */ return [$library->getId() => $library->getAttachableAssetLibrary($library_manager)]; }