--- /dev/null
+<?php
+
+namespace Drupal\libraries\ExternalLibrary\Asset;
+
+use Drupal\libraries\ExternalLibrary\LibraryInterface;
+use Drupal\libraries\ExternalLibrary\LibraryManagerInterface;
+
+/**
+ * An interface for library types that want to react to library instantiation.
+ */
+interface AttachableAssetLibraryRegistrationInterface {
+
+ /**
+ * Reacts to the instantiation of a library.
+ *
+ * @param \Drupal\libraries\ExternalLibrary\LibraryInterface $external_library
+ * The library that is being instantiated.
+ * @param \Drupal\libraries\ExternalLibrary\LibraryManagerInterface $library_manager
+ */
+ public function getAttachableAssetLibraries(LibraryInterface $external_library, LibraryManagerInterface $library_manager);
+
+}