From 95b2630fb805c120b17e21aa0f3a8a0be7e8ca65 Mon Sep 17 00:00:00 2001
From: Sheetal Nandi <shkamat@microsoft.com>
Date: Thu, 25 Jan 2018 09:30:20 -0800
Subject: [PATCH] Add watchFile option to use fsEvents on parent directory

---
 src/compiler/sys.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/compiler/sys.ts b/src/compiler/sys.ts
index 2097475758b..67beed19363 100644
--- a/src/compiler/sys.ts
+++ b/src/compiler/sys.ts
@@ -608,6 +608,9 @@ namespace ts {
                         // Use notifications from FS to watch with falling back to dynamic watch file
                         dynamicPollingWatchFile = createDynamicPriorityPollingWatchFile(nodeSystem);
                         return createWatchFileUsingDynamicWatchFile(dynamicPollingWatchFile);
+                    case "UseFsEventsOnParentDirectory":
+                        // Use notifications from FS to watch with falling back to fs.watchFile
+                        return createNonPollingWatchFile();
                 }
                 return useNonPollingWatchers ?
                     createNonPollingWatchFile() :