From 3b5d73f5cee0921c692e53e5b1e6489a61e8faa9 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Tue, 16 Jun 2015 12:13:18 -0700
Subject: [PATCH] Use Object.create(null) in __extends when base is null

---
 src/compiler/emitter.ts | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index 8081668f98c..5181a0f17f5 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -21,8 +21,7 @@ namespace ts {
 var __extends = (this && this.__extends) || function (d, b) {
     for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
     function __() { this.constructor = d; }
-    __.prototype = b.prototype;
-    d.prototype = new __();
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };`;
 
         // emit output for the __decorate helper function