From a5a6c10322ed2fbdb04180d32abb14bc9a8a86a2 Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wwigham@gmail.com>
Date: Wed, 2 Dec 2015 21:06:32 -0800
Subject: [PATCH] use typeof to check for presence of `JSON` global

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

diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index 280b8203ff4..95bf4ff7fa3 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -2400,7 +2400,7 @@ namespace ts {
      * Serialize an object graph into a JSON string. This is intended only for use on an acyclic graph
      * as the fallback implementation does not check for circular references by default.
      */
-    export const stringify: (value: any) => string = JSON && JSON.stringify
+    export const stringify: (value: any) => string = typeof JSON !== "undefined" && JSON.stringify
         ? JSON.stringify
         : stringifyFallback;