From 91023227e49c6757522c826f6a4fbaeb61693252 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <drosen@microsoft.com>
Date: Thu, 31 Jul 2014 21:58:05 -0700
Subject: [PATCH] Changed watchFile callback behavior.

We no longer recompile unless the new last-modified time is more recent.
---
 src/compiler/sys.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/compiler/sys.ts b/src/compiler/sys.ts
index ce31988b504..03d517476cd 100644
--- a/src/compiler/sys.ts
+++ b/src/compiler/sys.ts
@@ -199,7 +199,11 @@ var sys: System = (function () {
                     close() { _fs.unwatchFile(fileName, fileChanged); }
                 };
 
-                function fileChanged() {
+                function fileChanged(curr:any, prev:any) {
+                    if (+curr.mtime <= +prev.mtime) {
+                        return;
+                    }
+
                     callback(fileName);
                 };
             },