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diff --git a/web/modules/contrib/libraries/src/ExternalLibrary/Asset/AssetLibrary.php b/web/modules/contrib/libraries/src/ExternalLibrary/Asset/AssetLibrary.php
new file mode 100644
index 000000000..50a318686
--- /dev/null
+++ b/web/modules/contrib/libraries/src/ExternalLibrary/Asset/AssetLibrary.php
@@ -0,0 +1,128 @@
+<?php
+
+namespace Drupal\libraries\ExternalLibrary\Asset;
+
+use Drupal\Component\Plugin\Factory\FactoryInterface;
+use Drupal\libraries\ExternalLibrary\Exception\LibraryNotInstalledException;
+use Drupal\libraries\ExternalLibrary\LibraryBase;
+use Drupal\libraries\ExternalLibrary\LibraryManagerInterface;
+use Drupal\libraries\ExternalLibrary\Local\LocalLibraryInterface;
+use Drupal\libraries\ExternalLibrary\Local\LocalLibraryTrait;
+use Drupal\libraries\ExternalLibrary\Remote\RemoteLibraryInterface;
+use Drupal\libraries\ExternalLibrary\Remote\RemoteLibraryTrait;
+use Drupal\libraries\ExternalLibrary\Type\LibraryTypeInterface;
+
+/**
+ * Provides a class for a single attachable asset library.
+ */
+class AssetLibrary extends LibraryBase implements
+  AssetLibraryInterface,
+  LocalLibraryInterface,
+  RemoteLibraryInterface
+{
+
+  use
+    LocalLibraryTrait,
+    RemoteLibraryTrait,
+    LocalRemoteAssetTrait
+  ;
+
+  /**
+   * An array containing the CSS assets of the library.
+   *
+   * @var array
+   */
+  protected $cssAssets = [];
+
+  /**
+   * An array containing the JavaScript assets of the library.
+   *
+   * @var array
+   */
+  protected $jsAssets = [];
+
+  /**
+   * An array of attachable asset library IDs that this library depends on.
+   *
+   * @todo Explain the difference to regular dependencies.
+   */
+  protected $attachableDependencies = [];
+
+  /**
+   * Construct an external library.
+   *
+   * @param string $id
+   *   The library ID.
+   * @param array $definition
+   *   The library definition array.
+   * @param \Drupal\libraries\ExternalLibrary\Type\LibraryTypeInterface $library_type
+   *   The library type of the library.
+   */
+  public function __construct($id, array $definition, LibraryTypeInterface $library_type) {
+    parent::__construct($id, $definition, $library_type);
+    $this->remoteUrl = $definition['remote_url'];
+    $this->cssAssets = $definition['css'];
+    $this->jsAssets = $definition['js'];
+    $this->attachableDependencies = $definition['attachable_dependencies'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static function processDefinition(array &$definition) {
+    parent::processDefinition($definition);
+    $definition += [
+      'remote_url' => '',
+      'css' => [],
+      'js' => [],
+      'attachable_dependencies' => [],
+    ];
+  }
+
+  /**
+   * Returns a core library array structure for this library.
+   *
+   * @param \Drupal\libraries\ExternalLibrary\LibraryManagerInterface $library_manager
+   *   The library manager that can be used to fetch dependencies.
+   *
+   * @return array
+   *
+   * @see \Drupal\libraries\ExternalLibrary\Asset\getAttachableAssetLibraries::getAttachableAssetLibraries()
+   *
+   * @throws \Drupal\libraries\ExternalLibrary\Exception\InvalidLibraryDependencyException
+   * @throws \Drupal\libraries\ExternalLibrary\Exception\LibraryDefinitionNotFoundException
+   * @throws \Drupal\libraries\ExternalLibrary\Exception\LibraryTypeNotFoundException
+   * @throws \Drupal\Component\Plugin\Exception\PluginException
+   *
+   * @todo Document the return value.
+   */
+  public function getAttachableAssetLibrary(LibraryManagerInterface $library_manager) {
+    if (!$this->canBeAttached()) {
+      throw new LibraryNotInstalledException($this);
+    }
+    return [
+      'version' => $this->getVersion(),
+      'css' => $this->processCssAssets($this->cssAssets),
+      'js' => $this->processJsAssets($this->jsAssets),
+      'dependencies' => $this->attachableDependencies,
+    ];
+  }
+
+  /**
+   * Gets the locator of this library using the locator factory.
+   *
+   * @param \Drupal\Component\Plugin\Factory\FactoryInterface $locator_factory
+   *
+   * @return \Drupal\libraries\ExternalLibrary\Local\LocatorInterface
+   *
+   * @see \Drupal\libraries\ExternalLibrary\Local\LocalLibraryInterface::getLocator()
+   */
+  public function getLocator(FactoryInterface $locator_factory) {
+    // @todo Consider consolidating the stream wrappers used here. For now we
+    // allow asset libs to live almost anywhere.
+    return $locator_factory->createInstance('chain')
+      ->addLocator($locator_factory->createInstance('uri', ['uri' => 'asset://']))
+      ->addLocator($locator_factory->createInstance('uri', ['uri' => 'php-file://']));
+  }
+
+}