From 49c7888717f37b13e27333e0093e8d035b7c85bb Mon Sep 17 00:00:00 2001
From: Stephen Hebson <shebson@uber.com>
Date: Fri, 14 Aug 2015 13:40:55 -0400
Subject: [PATCH] Only add __set__ and __get__ methods if module.exports is an
 extensible object

---
 lib/index.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/index.js b/lib/index.js
index c5bcb68..626d0f3 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -33,8 +33,10 @@ module.exports = function rewireify(file, options) {
 
   function end() {
     post += "/* This code was injected by Rewireify */\n";
+    post += "if (typeof module.exports === 'object' && Object.isExtensible(module.exports)) {\n";
     post += "Object.defineProperty(module.exports, '__get__', { value: " + __get__ + ", writable: true });\n";
     post += "Object.defineProperty(module.exports, '__set__', { value: " + __set__ + ", writable: true });\n";
+    post += "}\n";
 
     this.queue(data);
     this.queue(post);