From 551a92d0c2c27e7e1ae9e0dc4d8846af41b09970 Mon Sep 17 00:00:00 2001
From: Moshe Atlow <moshe@atlow.co.il>
Date: Mon, 28 Nov 2022 00:03:42 +0200
Subject: [PATCH] fs: fix `nonNativeWatcher` watching folder with existing
 files

PR-URL: https://github.com/nodejs/node/pull/45500
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
---
 lib/internal/fs/recursive_watch.js       |  3 +++
 test/parallel/test-fs-watch-recursive.js | 30 ++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/lib/internal/fs/recursive_watch.js b/lib/internal/fs/recursive_watch.js
index 5c7a3e5b39a9a2..cbe513a166ec20 100644
--- a/lib/internal/fs/recursive_watch.js
+++ b/lib/internal/fs/recursive_watch.js
@@ -199,6 +199,9 @@ class FSWatcher extends EventEmitter {
         this.emit('change', 'rename', pathRelative(this.#rootPath, file));
       } else if (currentStats.isDirectory()) {
         this.#watchFolder(file);
+      } else {
+        // Watching a directory will trigger a change event for child files)
+        this.emit('change', 'change', pathRelative(this.#rootPath, file));
       }
     });
   }
diff --git a/test/parallel/test-fs-watch-recursive.js b/test/parallel/test-fs-watch-recursive.js
index acf3a3bc6a421d..eb91860d2e66ac 100644
--- a/test/parallel/test-fs-watch-recursive.js
+++ b/test/parallel/test-fs-watch-recursive.js
@@ -54,6 +54,36 @@ process.on('exit', function() {
   assert(watcherClosed, 'watcher Object was not closed');
 });
 
+(async () => {
+  // Watch a folder and update an already existing file in it.
+
+  const rootDirectory = fs.mkdtempSync(testDir + path.sep);
+  const testDirectory = path.join(rootDirectory, 'test-0');
+  fs.mkdirSync(testDirectory);
+
+  const testFile = path.join(testDirectory, 'file-1.txt');
+  fs.writeFileSync(testFile, 'hello');
+
+  const watcher = fs.watch(testDirectory, { recursive: true });
+  let watcherClosed = false;
+  watcher.on('change', common.mustCallAtLeast(function(event, filename) {
+    // Libuv inconsistenly emits a rename event for the file we are watching
+    assert.ok(event === 'change' || event === 'rename');
+
+    if (filename === path.basename(testFile)) {
+      watcher.close();
+      watcherClosed = true;
+    }
+  }));
+
+  await setTimeout(common.platformTimeout(100));
+  fs.writeFileSync(testFile, 'hello');
+
+  process.once('exit', function() {
+    assert(watcherClosed, 'watcher Object was not closed');
+  });
+})().then(common.mustCall());
+
 (async () => {
   // Assert recursive watch does not leak handles
   const rootDirectory = fs.mkdtempSync(testDir + path.sep);