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diff --git a/web/modules/contrib/libraries/src/ExternalLibrary/LibraryManagerInterface.php b/web/modules/contrib/libraries/src/ExternalLibrary/LibraryManagerInterface.php
new file mode 100644
index 000000000..0c4383f37
--- /dev/null
+++ b/web/modules/contrib/libraries/src/ExternalLibrary/LibraryManagerInterface.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace Drupal\libraries\ExternalLibrary;
+
+/**
+ * Provides an interface for external library managers.
+ */
+interface LibraryManagerInterface {
+
+  /**
+   * Gets a library by its ID.
+   *
+   * @param string $id
+   *   The library ID.
+   *
+   * @return \Drupal\libraries\ExternalLibrary\LibraryInterface
+   *   The library object.
+   *
+   * @throws \Drupal\libraries\ExternalLibrary\Exception\LibraryDefinitionNotFoundException
+   * @throws \Drupal\libraries\ExternalLibrary\Exception\LibraryTypeNotFoundException
+   * @throws \Drupal\Component\Plugin\Exception\PluginException
+   */
+  public function getLibrary($id);
+
+  /**
+   * Gets the list of libraries that are required by enabled extensions.
+   *
+   * Modules, themes, and installation profiles can declare library dependencies
+   * by specifying a 'library_dependencies' key in their info files.
+   *
+   * @return string[]
+   *   An array of library IDs.
+   */
+  public function getRequiredLibraryIds();
+
+  /**
+   * Loads library files for a library.
+   *
+   * Note that not all library types support explicit loading. Asset libraries,
+   * in particular, are declared to Drupal core's library system and are then
+   * loaded using that.
+   *
+   * @param string $id
+   *   The ID of the library.
+   *
+   * @throws \Drupal\libraries\ExternalLibrary\Exception\LibraryDefinitionNotFoundException
+   * @throws \Drupal\libraries\ExternalLibrary\Exception\LibraryNotInstalledException
+   */
+  public function load($id);
+
+}