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diff --git a/web/modules/contrib/libraries/src/StreamWrapper/LibraryDefinitionsStream.php b/web/modules/contrib/libraries/src/StreamWrapper/LibraryDefinitionsStream.php
new file mode 100644
index 000000000..7cf0764ec
--- /dev/null
+++ b/web/modules/contrib/libraries/src/StreamWrapper/LibraryDefinitionsStream.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace Drupal\libraries\StreamWrapper;
+
+use Drupal\Core\StreamWrapper\LocalStream;
+
+/**
+ * Provides a stream wrapper for library definitions.
+ *
+ * Can be used with the 'library-definitions' scheme, for example
+ * 'library-definitions://example.json' for a library ID of 'example'.
+ *
+ * By default this stream wrapper reads from a single directory that is
+ * configurable and points to the 'library-definitions' directory within the
+ * public files directory by default. This makes library definitions writable
+ * by the webserver by default, which is in anticipation of a user interface
+ * that fetches definitions from a remote repository and stores them locally.
+ * For improved security the library definitions can be managed manually (or put
+ * under version control) and placed in a directory that is not writable by the
+ * webserver.
+ *
+ * The idea of using a stream wrapper for this as well as the default location
+ * is taken from the 'translations' stream wrapper provided by the Interface
+ * Translation module.
+ *
+ * @see \Drupal\locale\StreamWrapper\TranslationsStream
+ *
+ * @todo Use a setting instead of configuration for the directory.
+ */
+class LibraryDefinitionsStream extends LocalStream {
+
+  use LocalHiddenStreamTrait;
+  use PrivateStreamTrait;
+
+  /**
+   * The config factory
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
+   * Constructs an external library registry.
+   *
+   * @todo Dependency injection.
+   */
+  public function __construct() {
+    $this->configFactory = \Drupal::configFactory();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getName() {
+    return t('Library definitions');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDescription() {
+    return t('Provides access to library definition files.');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDirectoryPath() {
+    return $this->getConfig('local.path');
+  }
+
+  /**
+   * Fetches a configuration value from the library definitions configuration.
+   * @param $key
+   *   The configuration key to fetch.
+   *
+   * @return array|mixed|null
+   *   The configuration value.
+   */
+  protected function getConfig($key) {
+    return $this->configFactory
+      ->get('libraries.settings')
+      ->get("definitions.$key");
+  }
+
+}