From 2abc7369554e5716e3c1a3e3e85cedb2138c0ce7 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <drosen@microsoft.com>
Date: Thu, 7 Apr 2016 00:55:02 -0700
Subject: [PATCH] Ensure that the entire contents of the prologue are simply
 'use strict'.

---
 src/compiler/factory.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/factory.ts b/src/compiler/factory.ts
index f7aa18fa7ea..0fd423d342c 100644
--- a/src/compiler/factory.ts
+++ b/src/compiler/factory.ts
@@ -1204,7 +1204,7 @@ namespace ts {
     // Utilities
 
     function isUseStrictPrologue(node: ExpressionStatement): boolean {
-        return !!(node.expression as StringLiteral).text.match(/use strict/);
+        return (node.expression as StringLiteral).text === "use strict";
     }
 
     export function addPrologueDirectives(target: Statement[], source: Statement[], ensureUseStrict?: boolean): number {