fs: protect fs.watch from monkeypatches

lib/fs.js

@@ -2299,7 +2299,7 @@ function watch(filename, options, listener) {
 
   let watcher;
 
-  // TODO(anonrig): Remove this when/if libuv supports it.
+  // TODO(anonrig): Remove non-native watcher when/if libuv supports recursive.
   // As of November 2022, libuv does not support recursive file watch on all platforms,
   // e.g. Linux due to the limitations of inotify.
   if (options.recursive && !isOSX && !isWindows) {

lib/internal/fs/promises.js

@@ -925,7 +925,7 @@ async function* _watch(filename, options = kEmptyObject) {
   if (options.recursive != null) {
     validateBoolean(options.recursive, 'options.recursive');
 
-    // TODO(anonrig): Remove this when/if libuv supports it.
+    // TODO(anonrig): Remove non-native watcher when/if libuv supports recursive.
     // As of November 2022, libuv does not support recursive file watch on all platforms,
     // e.g. Linux due to the limitations of inotify.
     if (options.recursive && !isOSX && !isWindows) {

lib/internal/fs/recursive_watch.js

@@ -23,7 +23,12 @@ const { getValidatedPath } = require('internal/fs/utils');
 const { kFSWatchStart, StatWatcher } = require('internal/fs/watchers');
 const { kEmptyObject } = require('internal/util');
 const { validateBoolean, validateAbortSignal } = require('internal/validators');
-const path = require('path');
+const {
+  basename: pathBasename,
+  join: pathJoin,
+  relative: pathRelative,
+  resolve: pathResolve,
+} = require('path');
 
 let internalSync;
 let internalPromises;
@@ -45,7 +50,7 @@ async function traverse(dir, files = new SafeMap(), symbolicLinks = new SafeSet(
   const subdirectories = [];
 
   for await (const file of filenames) {
-    const f = path.join(dir, file.name);
+    const f = pathJoin(dir, file.name);
 
     files.set(f, file);
 
@@ -67,7 +72,7 @@ class FSWatcher extends EventEmitter {
   #closed = false;
   #files = new SafeMap();
   #symbolicFiles = new SafeSet();
-  #rootPath = path.resolve();
+  #rootPath = pathResolve();
   #watchingFile = false;
 
   constructor(options = kEmptyObject) {
@@ -140,10 +145,10 @@ class FSWatcher extends EventEmitter {
           break;
         }
 
-        const f = path.join(folder, file.name);
+        const f = pathJoin(folder, file.name);
 
         if (!this.#files.has(f)) {
-          this.emit('change', 'rename', path.relative(this.#rootPath, f));
+          this.emit('change', 'rename', pathRelative(this.#rootPath, f));
 
           if (file.isSymbolicLink()) {
             this.#symbolicFiles.add(f);
@@ -186,23 +191,23 @@ class FSWatcher extends EventEmitter {
       if (currentStats.birthtimeMs === 0 && previousStats.birthtimeMs !== 0) {
         // The file is now deleted
         this.#files.delete(file);
-        this.emit('change', 'rename', path.relative(this.#rootPath, file));
+        this.emit('change', 'rename', pathRelative(this.#rootPath, file));
         this.#unwatchFiles(file);
       } else if (file === this.#rootPath && this.#watchingFile) {
         // This case will only be triggered when watching a file with fs.watch
-        this.emit('change', 'change', path.basename(file));
+        this.emit('change', 'change', pathBasename(file));
       } else if (this.#symbolicFiles.has(file)) {
         // Stats from watchFile does not return correct value for currentStats.isSymbolicLink()
         // Since it is only valid when using fs.lstat(). Therefore, check the existing symbolic files.
-        this.emit('change', 'rename', path.relative(this.#rootPath, file));
+        this.emit('change', 'rename', pathRelative(this.#rootPath, file));
       } else if (currentStats.isDirectory()) {
         this.#watchFolder(file);
       }
     });
   }
 
   [kFSWatchStart](filename) {
-    filename = path.resolve(getValidatedPath(filename));
+    filename = pathResolve(getValidatedPath(filename));
 
     try {
       const file = lazyLoadFsSync().statSync(filename);