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diff --git a/web/modules/contrib/libraries/src/StreamWrapper/PrivateStreamTrait.php b/web/modules/contrib/libraries/src/StreamWrapper/PrivateStreamTrait.php
new file mode 100644
index 000000000..4690551b9
--- /dev/null
+++ b/web/modules/contrib/libraries/src/StreamWrapper/PrivateStreamTrait.php
@@ -0,0 +1,39 @@
+<?php
+
+namespace Drupal\libraries\StreamWrapper;
+
+/**
+ * Provides a trait for local streams that are not publicly accessible.
+ *
+ * @see \Drupal\locale\StreamWrapper\TranslationsStream
+ */
+trait PrivateStreamTrait {
+
+  /**
+   * Returns a web accessible URL for the resource.
+   *
+   * This function should return a URL that can be embedded in a web page
+   * and accessed from a browser. For example, the external URL of
+   * "youtube://xIpLd0WQKCY" might be
+   * "http://www.youtube.com/watch?v=xIpLd0WQKCY".
+   *
+   * @return string
+   *   Returns a string containing a web accessible URL for the resource.
+   *
+   * @see \Drupal\Core\StreamWrapper\StreamWrapperInterface::getExternalUrl()
+   */
+  function getExternalUrl() {
+    throw new \LogicException("{$this->getName()} should not be public.");
+  }
+
+  /**
+   * Returns the name of the stream wrapper for use in the UI.
+   *
+   * @return string
+   *   The stream wrapper name.
+   *
+   * @see \Drupal\Core\StreamWrapper\StreamWrapperInterface::getName()
+   */
+  abstract public function getName();
+
+}