1 files changed, 13 insertions, 0 deletions
diff --git a/js/src/builtin/Classes.js b/js/src/builtin/Classes.js
new file mode 100644
index 0000000000..1043fdc4bc
--- /dev/null
+++ b/js/src/builtin/Classes.js
@@ -0,0 +1,13 @@
+/* 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/. */
+
+// Give a builtin constructor that we can use as the default. When we give
+// it to our newly made class, we will be sure to set it up with the correct name
+// and .prototype, so that everything works properly.
+
+var DefaultDerivedClassConstructor =
+    class extends null { constructor(...args) { super(...allowContentIter(args)); } };
+
+var DefaultBaseClassConstructor =
+    class { constructor() { } };