From 25d15d4b1487e84b493cb055cfa30533fce98ef9 Mon Sep 17 00:00:00 2001
From: Gary Katsevman <git@gkatsev.com>
Date: Fri, 22 Nov 2019 12:32:18 -0500
Subject: [PATCH] fix(extend): super_ should be available for backwards
 compatibility (#6329)

Fixes #6328
---
 src/js/extend.js         |  5 +++++
 test/unit/extend.test.js | 12 ++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/src/js/extend.js b/src/js/extend.js
index 0dd5daf192..098129e4ce 100644
--- a/src/js/extend.js
+++ b/src/js/extend.js
@@ -44,6 +44,11 @@ const extend = function(superClass, subClassMethods = {}) {
 
   _inherits(subClass, superClass);
 
+  // this is needed for backward-compatibility and node compatibility.
+  if (superClass) {
+    subClass.super_ = superClass;
+  }
+
   // Extend subObj's prototype with functions and other properties from props
   for (const name in methods) {
     if (methods.hasOwnProperty(name)) {
diff --git a/test/unit/extend.test.js b/test/unit/extend.test.js
index 84e034b961..8764e0b545 100644
--- a/test/unit/extend.test.js
+++ b/test/unit/extend.test.js
@@ -16,3 +16,15 @@ QUnit.test('should add implicit parent constructor call', function(assert) {
   assert.ok(superCalled, 'super constructor called');
   assert.ok(child.foo, 'child properties set');
 });
+
+QUnit.test('should have a super_ pointer', function(assert) {
+  const Parent = function() {};
+  const Child = extend(Parent, {
+    foo: 'bar'
+  });
+
+  const child = new Child();
+
+  assert.ok(child.foo, 'child properties set');
+  assert.equal(child.constructor.super_, Parent, 'super_ is present and equal to the super class');
+});