From 7349bcd3d3e052ee85bcd193ffb4c6d528de2c34 Mon Sep 17 00:00:00 2001
From: guybedford <guybedford@gmail.com>
Date: Tue, 15 Nov 2016 14:54:01 +0200
Subject: [PATCH] dont clobber existing System global

---
 src/system.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/system.js b/src/system.js
index 5d0f6d1a..c8af328a 100644
--- a/src/system.js
+++ b/src/system.js
@@ -5,7 +5,9 @@ SystemJSLoader.prototype.version = VERSION;
 
 var System = new SystemJSLoader();
 
-global.System = global.SystemJS = System;
+global.SystemJS = System;
+
+global.System = global.System || global.SystemJS;
 
 if (typeof module !== 'undefined' && module.exports)
   module.exports = System;