1 files changed, 15 insertions, 0 deletions
diff --git a/devtools/shared/extend.js b/devtools/shared/extend.js
new file mode 100644
index 0000000000..2241056c31
--- /dev/null
+++ b/devtools/shared/extend.js
@@ -0,0 +1,15 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/**
+ * Utility function, that is useful for creating objects that inherit from other
+ * objects, without associated classes.
+ *
+ * Replacement for `extends` API from "sdk/core/heritage".
+ */
+exports.extend = function(prototype, properties) {
+  return Object.create(prototype, Object.getOwnPropertyDescriptors(properties));
+};