From 3f6fe70f39a00e2b120ec07f3eea6a1194e924ce Mon Sep 17 00:00:00 2001
From: Matt Gaunt <mattgaunt@google.com>
Date: Wed, 14 Aug 2013 13:04:09 +0100
Subject: [PATCH] Prevent the defineProperty being called when property already
 exists

---
 colors.js | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/colors.js b/colors.js
index c830d6a..92612b5 100644
--- a/colors.js
+++ b/colors.js
@@ -50,11 +50,13 @@ var addProperty = function (color, func) {
   };
 
   if (Object.defineProperty) {
-    Object.defineProperty(String.prototype, color, {
-      get : func,
-      configurable: true,
-      enumerable: false
-    });
+    if(!String.prototype.hasOwnProperty(color)) {
+      Object.defineProperty(String.prototype, color, {
+        get : func,
+        configurable: true,
+        enumerable: false
+      });
+    }
   } else {
     String.prototype.__defineGetter__(color, func);
   }