From 1126bf7004ec6cabfeb0641eefc823175d33c4ba Mon Sep 17 00:00:00 2001
From: Stuart Taylor <staylor1012@gmail.com>
Date: Sun, 2 Apr 2017 17:51:07 +0100
Subject: [PATCH] Protect the global name space from the code editor

---
 common/app/routes/challenges/views/classic/Editor.jsx | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/common/app/routes/challenges/views/classic/Editor.jsx b/common/app/routes/challenges/views/classic/Editor.jsx
index dd90aa6b68..bade31f0d0 100644
--- a/common/app/routes/challenges/views/classic/Editor.jsx
+++ b/common/app/routes/challenges/views/classic/Editor.jsx
@@ -11,14 +11,17 @@ import CodeMirrorSkeleton from '../../Code-Mirror-Skeleton.jsx';
 import {
   executeChallenge,
   classicEditorUpdated,
-
   challengeMetaSelector,
   filesSelector,
   keySelector
 } from '../../redux';
 
+const envProps = typeof window !== 'undefined' ? Object.keys(window) : [];
 const options = {
-  lint: { esversion: 6 },
+  lint: {
+    esversion: 6,
+    predef: envProps
+  },
   lineNumbers: true,
   mode: 'javascript',
   theme: 'freecodecamp',