From eca55a6de757bd2f6347cc3593b950a4b8cdd1b6 Mon Sep 17 00:00:00 2001
From: Benjamin Goering <bengoering@gmail.com>
Date: Thu, 7 May 2015 18:13:12 -0700
Subject: [PATCH] better fetch-browser that preserves original fetch if it was
 there

---
 fetch-browser.js | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/fetch-browser.js b/fetch-browser.js
index 6f53df7..de9c9d9 100644
--- a/fetch-browser.js
+++ b/fetch-browser.js
@@ -1,9 +1,13 @@
 // the whatwg-fetch polyfill installs the fetch() function
 // on the global object (window or self)
-//
-// Return that as the export for use in Webpack, Browserify etc.
+var fetchWasDefined = 'fetch' in global;
+var originalGlobalFetch = global.fetch;
+
 require('whatwg-fetch');
-var globalFetch = fetch;
-delete global.fetch;
+module.exports = fetch;
 
-module.exports = globalFetch;
+if (fetchWasDefined) {
+	global.fetch = originalGlobalFetch;
+} else {
+	delete global.fetch;
+}