From 1251b46eb647d91312ba07e159afc16b4aaca8e6 Mon Sep 17 00:00:00 2001
From: Basarat Ali Syed <basaratali@gmail.com>
Date: Mon, 27 Jul 2015 17:42:49 +1000
Subject: [PATCH] SourceFile.fileWatcher should be optional

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

diff --git a/src/compiler/tsc.ts b/src/compiler/tsc.ts
index a657cc8c31..6872c4c876 100644
--- a/src/compiler/tsc.ts
+++ b/src/compiler/tsc.ts
@@ -3,7 +3,7 @@
 
 namespace ts {
     export interface SourceFile {
-        fileWatcher: FileWatcher;
+        fileWatcher?: FileWatcher;
     }
 
     /**