From 797ab0146732dee5ff8fb64724f5d06c6c0db073 Mon Sep 17 00:00:00 2001
From: Ingvar Stepanyan <me@rreverser.com>
Date: Fri, 22 Aug 2014 13:54:38 +0300
Subject: [PATCH] Return undefined instead of null.

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

diff --git a/src/services/services.ts b/src/services/services.ts
index 4e7323e1b5..0069f53922 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -1411,7 +1411,7 @@ module ts {
             return {
                 getSourceFile: (filename, languageVersion) => {
                     var sourceFile = getSourceFile(filename);
-                    return sourceFile ? sourceFile.getSourceFile() : null;
+                    return sourceFile && sourceFile.getSourceFile();
                 },
                 getCancellationToken: () => cancellationToken,
                 getCanonicalFileName: (filename) => useCaseSensitivefilenames ? filename : filename.toLowerCase(),