From e8a0f726ace7775d6efdecfb7c75007301e5d38d Mon Sep 17 00:00:00 2001
From: Tobias Koppers <tobias.koppers@googlemail.com>
Date: Wed, 9 Jan 2019 14:12:07 +0100
Subject: [PATCH 1/2] fallback to directory scan when change event without
 filename occurs

---
 lib/DirectoryWatcher.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/DirectoryWatcher.js b/lib/DirectoryWatcher.js
index f75634e..0aed93a 100644
--- a/lib/DirectoryWatcher.js
+++ b/lib/DirectoryWatcher.js
@@ -332,6 +332,14 @@ class DirectoryWatcher extends EventEmitter {
 
 	onWatchEvent(eventType, filename) {
 		if(this.closed) return;
+		if(!filename) {
+			// In some cases no filename is provided
+			// This seem to happen on windows
+			// So some event happened but we don't know which file is affected
+			// We have to do a full scan of the directory
+			this.doScan(false);
+			return;
+		}
 		if(this._activeEvents.get(filename) === undefined) {
 			this._activeEvents.set(filename, false);
 			const checkStats = () => {

From 3edd5c554e8311345ed945a4f0f3a976b7f29a6a Mon Sep 17 00:00:00 2001
From: Tobias Koppers <tobias.koppers@googlemail.com>
Date: Wed, 9 Jan 2019 14:20:20 +0100
Subject: [PATCH 2/2] early repeat scan

---
 lib/DirectoryWatcher.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/DirectoryWatcher.js b/lib/DirectoryWatcher.js
index 0aed93a..e7f1314 100644
--- a/lib/DirectoryWatcher.js
+++ b/lib/DirectoryWatcher.js
@@ -502,6 +502,12 @@ class DirectoryWatcher extends EventEmitter {
 					this.setMissing(file, initial, "scan (missing)");
 				}
 			}
+			if(this.scanAgain) {
+				// Early repeat of scan
+				this.scanAgain = false;
+				this.doScan(initial);
+				return;
+			}
 			async.forEach(itemPaths, (itemPath, callback) => {
 				fs.stat(itemPath, (err2, stats) => {
 					if(this.closed) return;