v6.4.0

feat(watchers): add Rust-powered watcher backend with runtime fallback and cross-platform test coverage
v6.3.1
2026-03-23 14:15:31 +00:00 · 2026-03-23 14:15:31 +00:00 · 2026-03-23 11:28:50 +00:00 · 2026-03-23 11:28:50 +00:00 · 2025-12-11 21:04:42 +00:00 · 2025-12-11 21:04:42 +00:00
30 changed files with 11062 additions and 3406 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -17,4 +17,8 @@ node_modules/
 dist/
 dist_*/

+# rust
+rust/target/
+dist_rust/
+
 # custom
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,83 @@
 # Changelog

+## 2026-03-23 - 6.4.0 - feat(watchers)
+add Rust-powered watcher backend with runtime fallback and cross-platform test coverage
+
+- introduces a new Rust watcher binary and TypeScript bridge using @push.rocks/smartrust
+- updates watcher selection to prefer the Rust backend when available and fall back to Node.js or Deno implementations
+- improves Deno event classification for any/other file system events
+- prevents Node.js watcher shutdown from affecting unrelated FSWatcher handles
+- adds platform-specific tests for Node.js, Deno, Bun, and Rust-backed watchers
+
+## 2026-03-23 - 6.3.1 - fix(watcher)
+unref lingering FSWatcher handles after stopping the node watcher
+
+- Ensures chokidar file watcher handles do not keep the process running after watcher shutdown
+- Works around chokidar v5 behavior where close() can resolve before all fs.watch() handles are fully released
+
+## 2025-12-11 - 6.3.0 - feat(watchers)
+Integrate chokidar-based Node watcher, expose awaitWriteFinish options, and update docs/tests
+
+- Add chokidar dependency and implement NodeWatcher as a chokidar wrapper for Node.js/Bun
+- Expose awaitWriteFinish, stabilityThreshold and pollInterval in IWatcherOptions and wire them into the NodeWatcher
+- Update watcher factory to return NodeWatcher for Node/Bun and DenoWatcher for Deno
+- Adjust tests to wait for chokidar readiness and to expect chokidar's atomic handling (delete+recreate -> change)
+- Revise README and technical hints to document chokidar usage and cross-runtime behavior
+
+## 2025-12-11 - 6.2.5 - fix(watcher.node)
+Normalize paths and improve Node watcher robustness: restart/rescan on errors (including ENOSPC), clear stale state, and remove legacy throttler
+
+- Normalize all paths to absolute at watcher entry points (watchPath, handleFsEvent, scanDirectory) to avoid relative/absolute mismatch bugs
+- On watcher restart: clear pending unlink timeouts, dispose stale DirEntry data, and perform a rescan to catch files created during the restart window
+- Trigger watcher restart on ENOSPC (inotify limit) errors instead of only logging the error
+- Remove the previous Throttler implementation and rely on the existing debounce + event-sequence tracking to handle rapid events
+- Atomic write handling and queued unlink behavior preserved; pending unlinks are cleared for restarted base paths to avoid stale events
+
+## 2025-12-11 - 6.2.4 - fix(tests)
+Stabilize tests and document chokidar-inspired Node watcher architecture
+
+- test: add waitForFileEvent helper to wait for events for a specific file (reduces test flakiness)
+- test: add small delays after unlink cleanup to account for atomic/temp-file debounce windows
+- docs: expand readme.hints.md with a detailed Node watcher architecture section (DirEntry, Throttler, atomic write handling, closer registry, constants and config)
+- docs: list updated test files and coverage scenarios (inode detection, atomic writes, stress tests)
+
+## 2025-12-11 - 6.2.3 - fix(watcher.node)
+Improve handling of temporary files from atomic editor writes in Node watcher
+
+- Detect temporary files produced by atomic editor saves and attempt to map them to the real target file instead of silently skipping the event
+- Add getTempFileTarget() to extract the real file path from temp filenames (supports patterns like file.ts.tmp.PID.TIMESTAMP and generic .tmp.*)
+- When a temp-file event is seen, queue a corresponding event for the resolved real file after a short delay (50ms) to allow rename/replace to complete
+- Add logging around temp file detection and real-file checks to aid debugging
+
+## 2025-12-11 - 6.2.2 - fix(watcher.node)
+Defer events during initial scan, track full event sequences, and harden watcher shutdown
+
+- Defer fs.watch events that arrive during the initial directory scan and process them after the scan completes to avoid race conditions where watchedFiles isn't populated.
+- Debounce now tracks the full sequence of events per file (rename/change) instead of collapsing to the last event, preventing intermediate events from being lost.
+- Detect delete+recreate via inode changes and emit unlink then add when appropriate; handle rapid create+delete sequences by emitting both events.
+- During stop(), cancel pending debounced emits before flipping _isWatching and make handleFsEvent return early when watcher is stopped to prevent orphaned timeouts and post-stop emits.
+- Add verbose logging of event sequences to aid debugging of complex fs event scenarios.
+- Update tests to expect unlink + add for inode replacement scenarios.
+- Version bump from 6.2.1 → 6.2.2
+
+## 2025-12-10 - 6.2.1 - fix(watcher.node)
+Handle fs.watch close without spurious restarts; add tests and improve test runner
+
+- Prevent spurious restarts and noisy warnings on fs.watch 'close' by checking the internal isWatching flag before logging and restarting (ts/watchers/watcher.node.ts).
+- Add comprehensive test suites covering basic operations, inode-change detection, atomic writes and stress scenarios (test/test.basic.ts, test/test.inode.ts, test/test.stress.ts).
+- Remove outdated test (test/test.ts) and delete the test asset test/assets/hi.txt.
+- Update test script in package.json to enable verbose logging, write a logfile and increase timeout to 120s to reduce flakiness in test runs.
+
+## 2025-12-10 - 6.2.0 - feat(watchers)
+Improve Node watcher robustness: file-level inode tracking, abortable restarts, restart race guards, and untracked-file handling
+
+- Add file-level inode tracking to detect delete+recreate (editor atomic saves) and emit correct 'change'/'add' events
+- Make restart delays abortable via AbortController so stop() cancels pending restarts and prevents orphan watchers
+- Guard against concurrent/dual restarts with restartingPaths to avoid race conditions between health checks and error handlers
+- Emit 'unlink' for deletions of previously untracked files (files created after initial scan) and clean up inode state
+- Track file inodes during initial scan and update/cleanup inode state on events
+- Improve logging for restart/inode/delete+recreate scenarios and update documentation/readme hints to v6.2.0+
+
 ## 2025-12-08 - 6.1.1 - fix(watchers/watcher.node)
 Improve Node watcher robustness: inode tracking, ENOSPC detection, enhanced health checks and temp-file handling

--- a/deno.lock
+++ b/deno.lock
--- a/npmextra.json
+++ b/npmextra.json
@@ -1,9 +1,5 @@
 {
-  "npmci": {
-    "npmGlobalTools": [],
-    "npmAccessLevel": "public"
-  },
-  "gitzone": {
+  "@git.zone/cli": {
    "projectType": "npm",
    "module": {
      "githost": "code.foss.global",
@@ -24,9 +20,22 @@
        "real-time",
        "watch files"
      ]
+    },
+    "release": {
+      "registries": [
+        "https://verdaccio.lossless.digital",
+        "https://registry.npmjs.org"
+      ],
+      "accessLevel": "public"
    }
  },
-  "tsdoc": {
+  "@git.zone/tsdoc": {
    "legal": "\n## License and Legal Information\n\nThis repository contains open-source code that is licensed under the MIT License. A copy of the MIT License can be found in the [license](license) file within this repository. \n\n**Please note:** The MIT License does not grant permission to use the trade names, trademarks, service marks, or product names of the project, except as required for reasonable and customary use in describing the origin of the work and reproducing the content of the NOTICE file.\n\n### Trademarks\n\nThis project is owned and maintained by Task Venture Capital GmbH. The names and logos associated with Task Venture Capital GmbH and any related products or services are trademarks of Task Venture Capital GmbH and are not included within the scope of the MIT license granted herein. Use of these trademarks must comply with Task Venture Capital GmbH's Trademark Guidelines, and any usage must be approved in writing by Task Venture Capital GmbH.\n\n### Company Information\n\nTask Venture Capital GmbH  \nRegistered at District court Bremen HRB 35230 HB, Germany\n\nFor any legal inquiries or if you require further information, please contact us via email at hello@task.vc.\n\nBy using this repository, you acknowledge that you have read this section, agree to comply with its terms, and understand that the licensing of the code does not imply endorsement by Task Venture Capital GmbH of any derivative works.\n"
+  },
+  "@git.zone/tsrust": {
+    "targets": ["linux_amd64", "linux_arm64"]
+  },
+  "@ship.zone/szci": {
+    "npmGlobalTools": []
  }
 }
--- a/package.json
+++ b/package.json
@@ -1,12 +1,12 @@
 {
  "name": "@push.rocks/smartwatch",
-  "version": "6.1.1",
+  "version": "6.4.0",
  "private": false,
  "description": "A cross-runtime file watcher with glob pattern support for Node.js, Deno, and Bun.",
  "main": "dist_ts/index.js",
  "typings": "dist_ts/index.d.ts",
  "scripts": {
-    "test": "(npm run prepareTest && tstest test/)",
+    "test": "(npm run prepareTest && tstest test/ --verbose --logfile --timeout 120)",
    "prepareTest": "(rm -f ./test/assets/hi.txt)",
    "build": "tsbuild tsfolders",
    "buildDocs": "tsdoc"
@@ -25,18 +25,20 @@
    "node": ">=20.0.0"
  },
  "dependencies": {
-    "@push.rocks/lik": "^6.2.2",
+    "@push.rocks/lik": "^6.4.0",
    "@push.rocks/smartenv": "^6.0.0",
    "@push.rocks/smartpromise": "^4.2.3",
+    "@push.rocks/smartrust": "^1.3.2",
    "@push.rocks/smartrx": "^3.0.10",
+    "chokidar": "^5.0.0",
    "picomatch": "^4.0.3"
  },
  "devDependencies": {
-    "@git.zone/tsbuild": "^3.1.2",
-    "@git.zone/tsrun": "^2.0.0",
-    "@git.zone/tstest": "^3.1.3",
-    "@push.rocks/smartfile": "^11.0.4",
-    "@types/node": "^24.10.1"
+    "@git.zone/tsbuild": "^4.3.0",
+    "@git.zone/tsrun": "^2.0.1",
+    "@git.zone/tsrust": "^1.3.0",
+    "@git.zone/tstest": "^3.5.0",
+    "@types/node": "^25.5.0"
  },
  "files": [
    "ts/**/*",
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
--- a/readme.hints.md
+++ b/readme.hints.md
@@ -1,14 +1,16 @@
-# smartchok - Technical Hints
+# smartwatch - Technical Hints

-## Native File Watching (v2.0.0+)
+## Native File Watching (v6.0.0+)

-The module now uses native file watching APIs instead of chokidar, providing cross-runtime support for Node.js, Deno, and Bun.
+The module provides cross-runtime file watching support:
+- **Node.js/Bun**: Uses [chokidar](https://github.com/paulmillr/chokidar) v5
+- **Deno**: Uses native `Deno.watchFs()`

 ### Exported Class

-The package exports the `Smartwatch` class (not `Smartchok`):
+The package exports the `Smartwatch` class:
 ```typescript
-import { Smartwatch } from '@push.rocks/smartchok';
+import { Smartwatch } from '@push.rocks/smartwatch';
 ```

 ### Architecture
@@ -16,111 +18,74 @@ import { Smartwatch } from '@push.rocks/smartchok';
 ```
 ts/
 ├── smartwatch.classes.smartwatch.ts   # Main Smartwatch class
-├── smartwatch.plugins.ts              # Dependencies (smartenv, picomatch, etc.)
+├── smartwatch.plugins.ts              # Dependencies
 ├── watchers/
 │   ├── index.ts                       # Factory with runtime detection
 │   ├── interfaces.ts                  # IWatcher interface and types
-│   ├── watcher.node.ts                # Node.js/Bun implementation (fs.watch)
-│   └── watcher.deno.ts                # Deno implementation (Deno.watchFs)
+│   ├── watcher.node.ts                # Node.js/Bun: chokidar wrapper
+│   └── watcher.deno.ts                # Deno: Deno.watchFs wrapper
 └── utils/
    └── write-stabilizer.ts            # awaitWriteFinish polling implementation
 ```

 ### Runtime Detection

-Uses `@push.rocks/smartenv` v6.x for runtime detection:
- **Node.js/Bun**: Uses native `fs.watch()` with `{ recursive: true }`
+Uses `@push.rocks/smartenv` for runtime detection:
+- **Node.js/Bun**: Uses chokidar (battle-tested file watcher)
 - **Deno**: Uses `Deno.watchFs()` async iterable

 ### Dependencies

- **picomatch**: Glob pattern matching (zero deps, well-maintained)
- **@push.rocks/smartenv**: Runtime detection (Node.js, Deno, Bun)
+- **chokidar**: Battle-tested file watcher for Node.js/Bun
+- **picomatch**: Glob pattern matching (zero deps)
+- **@push.rocks/smartenv**: Runtime detection
 - **@push.rocks/smartrx**: RxJS Subject/Observable management
 - **@push.rocks/smartpromise**: Deferred promise utilities
 - **@push.rocks/lik**: Stringmap for pattern storage

-### Why picomatch?
+### Chokidar Features (Node.js/Bun)

-Native file watching APIs don't support glob patterns. Picomatch provides glob pattern matching with:
- Zero dependencies
- 164M+ weekly downloads
- Excellent security profile
- Full glob syntax support
+The Node.js watcher (`ts/watchers/watcher.node.ts`) is a thin ~100 line wrapper around chokidar v5:
+
+```typescript
+chokidar.watch(paths, {
+  persistent: true,
+  ignoreInitial: false,
+  followSymlinks: options.followSymlinks,
+  depth: options.depth,
+  atomic: true,  // Handles atomic writes (delete+recreate, temp+rename)
+  awaitWriteFinish: { stabilityThreshold: 300, pollInterval: 100 },
+});
+```
+
+**Chokidar handles all edge cases:**
+- Atomic writes (temp file + rename pattern) → emits single 'change' event
+- Delete + recreate detection → emits single 'change' event
+- Inode tracking
+- Cross-platform differences (inotify, FSEvents, etc.)
+- Debouncing
+- Write stabilization
+- ENOSPC (inotify limit) errors

 ### Event Handling

-Native events are normalized to a consistent interface:
+Events are normalized across all runtimes:

-| Node.js/Bun Event | Deno Event | Normalized Event |
-|-------------------|------------|------------------|
-| `rename` (file exists) | `create` | `add` |
-| `rename` (file gone) | `remove` | `unlink` |
-| `change` | `modify` | `change` |
-
-### awaitWriteFinish Implementation
-
-The `WriteStabilizer` class replaces chokidar's built-in write stabilization:
- Polls file size until stable (configurable threshold: 300ms default)
- Configurable poll interval (100ms default)
- Handles file deletion during write detection
+| Event | Description |
+|-------|-------------|
+| `add` | File added |
+| `change` | File modified |
+| `unlink` | File removed |
+| `addDir` | Directory added |
+| `unlinkDir` | Directory removed |
+| `ready` | Initial scan complete |
+| `error` | Error occurred |

 ### Platform Requirements

- **Node.js 20+**: Required for native recursive watching on all platforms
+- **Node.js 20+**: Required for chokidar v5
 - **Deno**: Works on all versions with `Deno.watchFs()`
- **Bun**: Uses Node.js compatibility layer
-
-### Robustness Features (v6.1.0+)
-
-The Node.js watcher includes automatic recovery mechanisms based on learnings from [chokidar](https://github.com/paulmillr/chokidar) and known [fs.watch issues](https://github.com/nodejs/node/issues/47058):
-
-**Auto-restart on failure:**
- Watchers automatically restart when errors occur
- Exponential backoff (1s → 30s max)
- Maximum 3 retry attempts before giving up
-
-**Inode tracking (critical for long-running watchers):**
- `fs.watch()` watches the **inode**, not the path!
- When directories are replaced (git checkout, atomic saves), the inode changes
- Health check detects inode changes and restarts the watcher
- This is the most common cause of "watcher stops working after some time"
-
-**Health check monitoring:**
- 30-second periodic health checks
- Detects when watched paths disappear
- Detects inode changes (directory replacement)
- Detects ENOSPC errors (inotify limit exceeded)
-
-**ENOSPC detection (Linux inotify limit):**
- Detects when `/proc/sys/fs/inotify/max_user_watches` is exceeded
- Logs fix command: `echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p`
-
-**Error isolation:**
- Subscriber errors don't crash the watcher
- All events emitted via `safeEmit()` with try-catch
-
-**Verbose logging:**
- All lifecycle events logged with `[smartwatch]` prefix
- Helps debug watcher issues in production
-
-Example log output:
-```
-[smartwatch] Starting watcher for 1 base path(s)...
-[smartwatch] Started watching: ./test/assets/
-[smartwatch] Starting health check (every 30s)
-[smartwatch] Watcher started with 1 active watcher(s)
-[smartwatch] Health check: 1 watchers active
-[smartwatch] Inode changed for ./src: 12345 -> 67890
-[smartwatch] fs.watch watches inode, not path - restarting watcher
-```
-
-### Known fs.watch Limitations
-
-1. **Watches inode, not path** - If a directory is replaced, watcher goes stale
-2. **inotify limits on Linux** - Default `max_user_watches` (8192) may be too low
-3. **No events for some atomic writes** - Some editors' save patterns may not trigger events
-4. **Platform differences** - Linux uses inotify, macOS uses FSEvents/kqueue
+- **Bun**: Uses Node.js compatibility layer with chokidar

 ### Testing

@@ -128,10 +93,20 @@ Example log output:
 pnpm test
 ```

+Test files:
+- **test.basic.ts** - Core functionality (add, change, unlink events)
+- **test.inode.ts** - Atomic write detection (delete+recreate, temp+rename)
+- **test.stress.ts** - Rapid modifications, many files, interleaved operations
+
 Tests verify:
 - Creating Smartwatch instance
 - Adding glob patterns
- Receiving 'add' events for new files
+- Receiving 'add', 'change', 'unlink' events
+- Atomic write detection (delete+recreate → change event)
+- Temp file + rename pattern detection
+- Rapid file modifications (debouncing)
+- Many files created rapidly
+- Interleaved add/change/delete operations
 - Graceful shutdown

 ## Dev Dependencies
--- a/readme.md
+++ b/readme.md
@@ -1,6 +1,6 @@
 # @push.rocks/smartwatch

-A lightweight, cross-runtime file watcher with glob pattern support for **Node.js**, **Deno**, and **Bun**. Zero heavyweight dependencies — just native file watching APIs for maximum performance. 🚀
+A cross-runtime file watcher with glob pattern support for Node.js, Deno, and Bun.

 ## Issue Reporting and Security

@@ -16,14 +16,25 @@ pnpm add @push.rocks/smartwatch

 ## Features

-🌐 **Cross-Runtime** — Works seamlessly on Node.js 20+, Deno, and Bun
-🔍 **Glob Pattern Support** — Watch files using familiar patterns like `**/*.ts` and `src/**/*.{js,jsx}`
-📡 **RxJS Observables** — Subscribe to file system events using reactive streams
-🔄 **Dynamic Watching** — Add or remove watch patterns at runtime
-⚡ **Native Performance** — Uses `fs.watch()` on Node.js/Bun and `Deno.watchFs()` on Deno
-✨ **Write Stabilization** — Built-in debouncing prevents duplicate events during file writes
-🎯 **TypeScript First** — Full TypeScript support with comprehensive type definitions
-📦 **Minimal Footprint** — No chokidar, no FSEvents bindings — just ~500 lines of focused code
+- **Cross-Runtime** — Works on Node.js 20+, Deno, and Bun
+- **Glob Pattern Support** — Watch files using patterns like `**/*.ts` and `src/**/*.{js,jsx}`
+- **RxJS Observables** — Subscribe to file system events using reactive streams
+- **Dynamic Watching** — Add or remove watch patterns at runtime
+- **Write Stabilization** — Built-in debouncing and awaitWriteFinish support for atomic writes
+- **TypeScript First** — Full TypeScript support with comprehensive type definitions
+
+## How It Works
+
+smartwatch selects the best file watching backend for the current runtime:
+
+| Runtime         | Backend                          |
+|-----------------|----------------------------------|
+| **Node.js/Bun** | [chokidar](https://github.com/paulmillr/chokidar) v5 (uses `fs.watch()` internally) |
+| **Deno**        | Native `Deno.watchFs()` API      |
+
+On Node.js and Bun, chokidar provides robust cross-platform file watching with features like atomic write detection, inode tracking, and write stabilization. On Deno, native APIs are used directly with built-in debouncing and temporary file filtering.
+
+Glob patterns are handled through [picomatch](https://github.com/micromatch/picomatch) — base paths are extracted from patterns and watched natively, while events are filtered through matchers before emission.

 ## Usage

@@ -34,8 +45,8 @@ import { Smartwatch } from '@push.rocks/smartwatch';

 // Create a watcher with glob patterns
 const watcher = new Smartwatch([
-  './src/**/*.ts',           // Watch all TypeScript files in src
-  './public/assets/**/*'     // Watch all files in public/assets
+  './src/**/*.ts',
+  './public/assets/**/*'
 ]);

 // Start watching
@@ -49,15 +60,9 @@ Use RxJS observables to react to file system changes:
 ```typescript
 // Get an observable for file changes
 const changeObservable = await watcher.getObservableFor('change');
-
-changeObservable.subscribe({
-  next: ([path, stats]) => {
-    console.log(`File changed: ${path}`);
-    console.log(`New size: ${stats?.size} bytes`);
-  },
-  error: (err) => {
-    console.error(`Error: ${err}`);
-  }
+changeObservable.subscribe(([path, stats]) => {
+  console.log(`File changed: ${path}`);
+  console.log(`New size: ${stats?.size} bytes`);
 });

 // Watch for new files
@@ -103,7 +108,6 @@ watcher.remove('./src/**/*.test.ts');
 ### Stopping the Watcher

 ```typescript
-// Stop watching when done
 await watcher.stop();
 ```

@@ -113,38 +117,31 @@ await watcher.stop();
 import { Smartwatch } from '@push.rocks/smartwatch';

 async function watchProject() {
-  // Initialize with patterns
  const watcher = new Smartwatch([
    './src/**/*.ts',
    './package.json'
  ]);

-  // Start the watcher
  await watcher.start();
-  console.log('👀 Watching for changes...');
+  console.log('Watching for changes...');

-  // Subscribe to changes
  const changes = await watcher.getObservableFor('change');
  changes.subscribe(([path, stats]) => {
-    console.log(`📝 Modified: ${path}`);
-    console.log(`   Size: ${stats?.size ?? 'unknown'} bytes`);
+    console.log(`Modified: ${path} (${stats?.size ?? 'unknown'} bytes)`);
  });

-  // Subscribe to new files
  const additions = await watcher.getObservableFor('add');
  additions.subscribe(([path]) => {
-    console.log(`✨ New file: ${path}`);
+    console.log(`New file: ${path}`);
  });

-  // Subscribe to deletions
  const deletions = await watcher.getObservableFor('unlink');
  deletions.subscribe(([path]) => {
-    console.log(`🗑️ Deleted: ${path}`);
+    console.log(`Deleted: ${path}`);
  });

  // Handle graceful shutdown
  process.on('SIGINT', async () => {
-    console.log('\n🛑 Stopping watcher...');
    await watcher.stop();
    process.exit(0);
  });
@@ -153,41 +150,6 @@ async function watchProject() {
 watchProject();
 ```

-## How It Works
-
-smartwatch uses native file watching APIs for each runtime:
-
-| Runtime         | API Used                         |
-|-----------------|----------------------------------|
-| **Node.js 20+** | `fs.watch({ recursive: true })`  |
-| **Deno**        | `Deno.watchFs()`                 |
-| **Bun**         | Node.js compatibility layer      |
-
-### Under the Hood
-
-Native file watching APIs don't support glob patterns directly, so smartwatch handles pattern matching internally:
-
-1. **Base path extraction** — Extracts the static portion from each glob pattern (e.g., `./src/` from `./src/**/*.ts`)
-2. **Efficient watching** — Native watchers monitor only the base directories
-3. **Pattern filtering** — Events are filtered through [picomatch](https://github.com/micromatch/picomatch) matchers before emission
-4. **Event deduplication** — Built-in throttling prevents duplicate events from rapid file operations
-
-### Write Stabilization
-
-smartwatch includes built-in write stabilization (similar to chokidar's `awaitWriteFinish`). When a file is being written, events are held until the file size stabilizes, preventing multiple events for a single write operation.
-
-Default settings:
- **Stability threshold**: 300ms
- **Poll interval**: 100ms
-
-## Requirements
-
-| Runtime         | Version                                |
-|-----------------|----------------------------------------|
-| **Node.js**     | 20+ (required for native recursive watching) |
-| **Deno**        | Any version with `Deno.watchFs()` support |
-| **Bun**         | Uses Node.js compatibility             |
-
 ## API Reference

 ### `Smartwatch`
@@ -226,18 +188,13 @@ type TFsEvent = 'add' | 'addDir' | 'change' | 'error' | 'unlink' | 'unlinkDir' |
 type TSmartwatchStatus = 'idle' | 'starting' | 'watching';
 ```

-## Why smartwatch?
+## Requirements

-| Feature                 | smartwatch            | chokidar           |
-|-------------------------|----------------------|--------------------|
-| Native API              | ✅ Direct `fs.watch`  | ❌ FSEvents bindings |
-| Cross-runtime           | ✅ Node, Deno, Bun    | ❌ Node only        |
-| Dependencies            | 4 small packages     | ~20 packages       |
-| Write stabilization     | ✅ Built-in           | ✅ Built-in         |
-| Glob support            | ✅ picomatch          | ✅ anymatch         |
-| Bundle size             | ~15KB                | ~200KB+            |
-
-If you need a lightweight file watcher without native compilation headaches, smartwatch has you covered.
+| Runtime         | Version                                |
+|-----------------|----------------------------------------|
+| **Node.js**     | 20+                                    |
+| **Deno**        | Any version with `Deno.watchFs()` support |
+| **Bun**         | Uses Node.js compatibility layer       |

 ## License and Legal Information

--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -0,0 +1,493 @@
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+# It is not intended for manual editing.
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--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "smartwatch-rust"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "smartwatch-rust"
+path = "src/main.rs"
+
+[dependencies]
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+notify = "7"
+notify-debouncer-full = "0.4"
+
+[profile.release]
+opt-level = "z"
+lto = true
+strip = true
--- a/rust/src/main.rs
+++ b/rust/src/main.rs
@@ -0,0 +1,289 @@
+use notify_debouncer_full::{new_debouncer, DebounceEventResult, DebouncedEvent, RecommendedCache};
+use notify::{RecommendedWatcher, RecursiveMode, EventKind};
+use serde::{Deserialize, Serialize};
+use std::io::{self, BufRead, Write};
+use std::path::Path;
+use std::sync::mpsc;
+use std::time::Duration;
+
+// --- IPC message types ---
+
+#[derive(Deserialize)]
+struct Request {
+    id: String,
+    method: String,
+    #[serde(default)]
+    params: serde_json::Value,
+}
+
+#[derive(Serialize)]
+struct Response {
+    id: String,
+    success: bool,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    result: Option<serde_json::Value>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    error: Option<String>,
+}
+
+#[derive(Serialize)]
+struct Event {
+    event: String,
+    data: serde_json::Value,
+}
+
+// --- Watch command params ---
+
+#[derive(Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct WatchParams {
+    paths: Vec<String>,
+    #[serde(default = "default_depth")]
+    depth: u32,
+    #[serde(default)]
+    follow_symlinks: bool,
+    #[serde(default = "default_debounce")]
+    debounce_ms: u64,
+}
+
+fn default_depth() -> u32 { 4 }
+fn default_debounce() -> u64 { 100 }
+
+// --- Output helpers (thread-safe via stdout lock) ---
+
+fn send_line(line: &str) {
+    let stdout = io::stdout();
+    let mut handle = stdout.lock();
+    let _ = handle.write_all(line.as_bytes());
+    let _ = handle.write_all(b"\n");
+    let _ = handle.flush();
+}
+
+fn send_response(resp: &Response) {
+    if let Ok(json) = serde_json::to_string(resp) {
+        send_line(&json);
+    }
+}
+
+fn send_event(name: &str, data: serde_json::Value) {
+    let evt = Event { event: name.to_string(), data };
+    if let Ok(json) = serde_json::to_string(&evt) {
+        send_line(&json);
+    }
+}
+
+fn ok_response(id: String, result: serde_json::Value) -> Response {
+    Response { id, success: true, result: Some(result), error: None }
+}
+
+fn err_response(id: String, msg: String) -> Response {
+    Response { id, success: false, result: None, error: Some(msg) }
+}
+
+// --- Map notify EventKind to our event type strings ---
+
+fn event_kind_to_type(kind: &EventKind) -> Option<&'static str> {
+    match kind {
+        EventKind::Create(_) => Some("create"),
+        EventKind::Modify(_) => Some("change"),
+        EventKind::Remove(_) => Some("remove"),
+        _ => None,
+    }
+}
+
+/// Determine if a path is a directory
+fn classify_path(path: &Path) -> &'static str {
+    if path.is_dir() { "dir" } else { "file" }
+}
+
+/// Walk a directory and emit add/addDir events for initial scan
+fn scan_directory(dir: &Path, depth: u32, max_depth: u32) {
+    if depth > max_depth {
+        return;
+    }
+    let entries = match std::fs::read_dir(dir) {
+        Ok(e) => e,
+        Err(_) => return,
+    };
+    for entry in entries.flatten() {
+        let path = entry.path();
+        let path_str = path.to_string_lossy().to_string();
+        if path.is_dir() {
+            send_event("fsEvent", serde_json::json!({
+                "type": "addDir",
+                "path": path_str,
+            }));
+            scan_directory(&path, depth + 1, max_depth);
+        } else if path.is_file() {
+            send_event("fsEvent", serde_json::json!({
+                "type": "add",
+                "path": path_str,
+            }));
+        }
+    }
+}
+
+// --- Messages between threads ---
+
+enum MainMessage {
+    StdinLine(String),
+    StdinClosed,
+    FsEvents(Vec<DebouncedEvent>),
+    FsError(Vec<notify::Error>),
+}
+
+// --- Main ---
+
+fn main() {
+    let args: Vec<String> = std::env::args().collect();
+    if !args.contains(&"--management".to_string()) {
+        eprintln!("smartwatch-rust: use --management flag for IPC mode");
+        std::process::exit(1);
+    }
+
+    // Signal ready
+    send_event("ready", serde_json::json!({}));
+
+    // Single channel for all messages to the main thread
+    let (main_tx, main_rx) = mpsc::channel::<MainMessage>();
+
+    // Spawn stdin reader thread
+    let stdin_tx = main_tx.clone();
+    std::thread::spawn(move || {
+        let stdin = io::stdin();
+        for line in stdin.lock().lines() {
+            match line {
+                Ok(l) => {
+                    let trimmed = l.trim().to_string();
+                    if !trimmed.is_empty() {
+                        if stdin_tx.send(MainMessage::StdinLine(trimmed)).is_err() {
+                            break;
+                        }
+                    }
+                }
+                Err(_) => break,
+            }
+        }
+        let _ = stdin_tx.send(MainMessage::StdinClosed);
+    });
+
+    // State: active debouncer
+    let mut active_debouncer: Option<notify_debouncer_full::Debouncer<
+        RecommendedWatcher,
+        RecommendedCache,
+    >> = None;
+
+    // Main event loop — receives both stdin lines and FS events
+    for msg in &main_rx {
+        match msg {
+            MainMessage::StdinClosed => break,
+
+            MainMessage::FsEvents(events) => {
+                for event in events {
+                    let Some(event_type) = event_kind_to_type(&event.kind) else {
+                        continue;
+                    };
+                    for path in &event.paths {
+                        let path_str = path.to_string_lossy().to_string();
+                        let path_kind = classify_path(path);
+                        let fs_type = match (event_type, path_kind) {
+                            ("create", "dir") => "addDir",
+                            ("create", _) => "add",
+                            ("change", _) => "change",
+                            ("remove", "dir") => "unlinkDir",
+                            ("remove", _) => "unlink",
+                            _ => continue,
+                        };
+                        send_event("fsEvent", serde_json::json!({
+                            "type": fs_type,
+                            "path": path_str,
+                        }));
+                    }
+                }
+            }
+
+            MainMessage::FsError(errors) => {
+                for err in errors {
+                    send_event("error", serde_json::json!({
+                        "message": format!("{}", err),
+                    }));
+                }
+            }
+
+            MainMessage::StdinLine(line) => {
+                let request: Request = match serde_json::from_str(&line) {
+                    Ok(r) => r,
+                    Err(e) => {
+                        send_response(&err_response(
+                            "unknown".to_string(),
+                            format!("Failed to parse request: {}", e),
+                        ));
+                        continue;
+                    }
+                };
+
+                match request.method.as_str() {
+                    "watch" => {
+                        let params: WatchParams = match serde_json::from_value(request.params) {
+                            Ok(p) => p,
+                            Err(e) => {
+                                send_response(&err_response(request.id, format!("Invalid params: {}", e)));
+                                continue;
+                            }
+                        };
+
+                        // Stop any existing watcher
+                        active_debouncer.take();
+
+                        let debounce_duration = Duration::from_millis(params.debounce_ms);
+                        let fs_tx = main_tx.clone();
+
+                        let debouncer = new_debouncer(
+                            debounce_duration,
+                            None,
+                            move |result: DebounceEventResult| {
+                                match result {
+                                    Ok(events) => { let _ = fs_tx.send(MainMessage::FsEvents(events)); }
+                                    Err(errors) => { let _ = fs_tx.send(MainMessage::FsError(errors)); }
+                                }
+                            },
+                        );
+
+                        match debouncer {
+                            Ok(mut debouncer) => {
+                                for path_str in &params.paths {
+                                    let path = Path::new(path_str);
+                                    if let Err(e) = debouncer.watch(path, RecursiveMode::Recursive) {
+                                        eprintln!("Watch error for {}: {}", path_str, e);
+                                    }
+                                }
+
+                                // Initial scan
+                                for path_str in &params.paths {
+                                    scan_directory(Path::new(path_str), 0, params.depth);
+                                }
+
+                                send_event("watchReady", serde_json::json!({}));
+                                active_debouncer = Some(debouncer);
+                                send_response(&ok_response(request.id, serde_json::json!({ "watching": true })));
+                            }
+                            Err(e) => {
+                                send_response(&err_response(request.id, format!("Failed to create watcher: {}", e)));
+                            }
+                        }
+                    }
+                    "stop" => {
+                        active_debouncer.take();
+                        send_response(&ok_response(request.id, serde_json::json!({ "stopped": true })));
+                    }
+                    other => {
+                        send_response(&err_response(request.id, format!("Unknown method: {}", other)));
+                    }
+                }
+            }
+        }
+    }
+
+    // Clean up
+    active_debouncer.take();
+}
--- a/test/assets/hi.txt
+++ b/test/assets/hi.txt
@@ -1 +0,0 @@
-HI
--- a/test/test.basic.ts
+++ b/test/test.basic.ts
@@ -0,0 +1,158 @@
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import * as smartwatch from '../ts/index.js';
+import * as smartrx from '@push.rocks/smartrx';
+
+import * as fs from 'fs';
+import * as path from 'path';
+
+// Skip in CI
+if (process.env.CI) {
+  process.exit(0);
+}
+
+const TEST_DIR = './test/assets';
+
+// Helper to delay
+const delay = (ms: number) => new Promise<void>((resolve) => setTimeout(resolve, ms));
+
+// Helper to wait for an event with timeout
+async function waitForEvent<T>(
+  observable: smartrx.rxjs.Observable<T>,
+  timeoutMs: number = 5000
+): Promise<T> {
+  return new Promise((resolve, reject) => {
+    const timeout = setTimeout(() => {
+      subscription.unsubscribe();
+      reject(new Error(`Timeout waiting for event after ${timeoutMs}ms`));
+    }, timeoutMs);
+
+    const subscription = observable.subscribe((value) => {
+      clearTimeout(timeout);
+      subscription.unsubscribe();
+      resolve(value);
+    });
+  });
+}
+
+// Helper to wait for a specific file's event (filters by filename)
+async function waitForFileEvent<T extends [string, ...any[]]>(
+  observable: smartrx.rxjs.Observable<T>,
+  expectedFile: string,
+  timeoutMs: number = 5000
+): Promise<T> {
+  return new Promise((resolve, reject) => {
+    const timeout = setTimeout(() => {
+      subscription.unsubscribe();
+      reject(new Error(`Timeout waiting for event on ${expectedFile} after ${timeoutMs}ms`));
+    }, timeoutMs);
+
+    const subscription = observable.subscribe((value) => {
+      const [filePath] = value;
+      if (filePath.includes(expectedFile)) {
+        clearTimeout(timeout);
+        subscription.unsubscribe();
+        resolve(value);
+      }
+      // Otherwise keep waiting for the right file
+    });
+  });
+}
+
+let testSmartwatch: smartwatch.Smartwatch;
+
+// ===========================================
+// BASIC TESTS
+// ===========================================
+
+tap.test('should create a new instance', async () => {
+  testSmartwatch = new smartwatch.Smartwatch([]);
+  expect(testSmartwatch).toBeInstanceOf(smartwatch.Smartwatch);
+});
+
+tap.test('should add paths and start watching', async () => {
+  testSmartwatch.add([`${TEST_DIR}/**/*.txt`]);
+  await testSmartwatch.start();
+  expect(testSmartwatch.status).toEqual('watching');
+  // Wait for chokidar to be ready
+  await delay(500);
+});
+
+tap.test('should detect ADD event for new files', async () => {
+  const addObservable = await testSmartwatch.getObservableFor('add');
+
+  // Subscribe FIRST, then create file
+  const eventPromise = waitForFileEvent(addObservable, 'add-test.txt');
+
+  // Create a new file
+  const testFile = path.join(TEST_DIR, 'add-test.txt');
+  await fs.promises.writeFile(testFile, 'test content');
+
+  const [filePath] = await eventPromise;
+  expect(filePath).toInclude('add-test.txt');
+
+  // Cleanup
+  await fs.promises.unlink(testFile);
+  await delay(200);
+});
+
+tap.test('should detect CHANGE event for modified files', async () => {
+  // First create the file
+  const testFile = path.join(TEST_DIR, 'change-test.txt');
+  await fs.promises.writeFile(testFile, 'initial content');
+
+  // Wait for add event to complete
+  await delay(300);
+
+  const changeObservable = await testSmartwatch.getObservableFor('change');
+  const eventPromise = waitForFileEvent(changeObservable, 'change-test.txt');
+
+  // Modify the file
+  await fs.promises.writeFile(testFile, 'modified content');
+
+  const [filePath] = await eventPromise;
+  expect(filePath).toInclude('change-test.txt');
+
+  // Cleanup
+  await fs.promises.unlink(testFile);
+  await delay(200);
+});
+
+tap.test('should detect UNLINK event for deleted files', async () => {
+  // First create the file
+  const testFile = path.join(TEST_DIR, 'unlink-test.txt');
+  await fs.promises.writeFile(testFile, 'to be deleted');
+
+  // Wait for add event to complete
+  await delay(300);
+
+  const unlinkObservable = await testSmartwatch.getObservableFor('unlink');
+
+  // Use file-specific wait to handle any pending unlinks from other tests
+  const eventPromise = waitForFileEvent(unlinkObservable, 'unlink-test.txt');
+
+  // Delete the file
+  await fs.promises.unlink(testFile);
+
+  const [filePath] = await eventPromise;
+  expect(filePath).toInclude('unlink-test.txt');
+});
+
+tap.test('should stop the watch process', async () => {
+  await testSmartwatch.stop();
+  expect(testSmartwatch.status).toEqual('idle');
+});
+
+tap.test('cleanup: remove any remaining test files', async () => {
+  const files = await fs.promises.readdir(TEST_DIR);
+  for (const file of files) {
+    if (file.startsWith('add-') || file.startsWith('change-') || file.startsWith('unlink-')) {
+      try {
+        await fs.promises.unlink(path.join(TEST_DIR, file));
+      } catch {
+        // Ignore
+      }
+    }
+  }
+});
+
+export default tap.start();
--- a/test/test.fswatcher-linger.node.ts
+++ b/test/test.fswatcher-linger.node.ts
@@ -0,0 +1,86 @@
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import * as chokidar from 'chokidar';
+import * as fs from 'fs';
+import * as path from 'path';
+
+const TEST_DIR = './test/assets';
+const delay = (ms: number) => new Promise<void>((resolve) => setTimeout(resolve, ms));
+
+/**
+ * Count active FSWatcher handles in the process
+ */
+function countFSWatcherHandles(): number {
+  const handles = (process as any)._getActiveHandles();
+  return handles.filter((h: any) => h?.constructor?.name === 'FSWatcher').length;
+}
+
+tap.test('should not leave lingering FSWatcher handles after chokidar close', async () => {
+  const handlesBefore = countFSWatcherHandles();
+  console.log(`FSWatcher handles before: ${handlesBefore}`);
+
+  // Start a chokidar watcher
+  const watcher = chokidar.watch(path.resolve(TEST_DIR), {
+    persistent: true,
+    ignoreInitial: false,
+  });
+
+  // Wait for ready
+  await new Promise<void>((resolve) => watcher.on('ready', resolve));
+
+  const handlesDuring = countFSWatcherHandles();
+  console.log(`FSWatcher handles during watch: ${handlesDuring}`);
+  expect(handlesDuring).toBeGreaterThan(handlesBefore);
+
+  // Close the watcher
+  await watcher.close();
+  console.log('chokidar.close() resolved');
+
+  // Check immediately after close
+  const handlesAfterClose = countFSWatcherHandles();
+  console.log(`FSWatcher handles immediately after close: ${handlesAfterClose}`);
+
+  // Wait a bit and check again to see if handles are cleaned up asynchronously
+  await delay(500);
+  const handlesAfterDelay500 = countFSWatcherHandles();
+  console.log(`FSWatcher handles after 500ms: ${handlesAfterDelay500}`);
+
+  await delay(1500);
+  const handlesAfterDelay2000 = countFSWatcherHandles();
+  console.log(`FSWatcher handles after 2000ms: ${handlesAfterDelay2000}`);
+
+  const lingeringHandles = handlesAfterDelay2000 - handlesBefore;
+  console.log(`Lingering FSWatcher handles: ${lingeringHandles}`);
+
+  if (lingeringHandles > 0) {
+    console.log('WARNING: chokidar left lingering FSWatcher handles after close()');
+  } else {
+    console.log('OK: all FSWatcher handles were cleaned up');
+  }
+
+  expect(lingeringHandles).toEqual(0);
+});
+
+tap.test('should not leave handles after multiple open/close cycles', async () => {
+  const handlesBefore = countFSWatcherHandles();
+  console.log(`\nMulti-cycle test - handles before: ${handlesBefore}`);
+
+  for (let i = 0; i < 3; i++) {
+    const watcher = chokidar.watch(path.resolve(TEST_DIR), {
+      persistent: true,
+      ignoreInitial: false,
+    });
+    await new Promise<void>((resolve) => watcher.on('ready', resolve));
+    const during = countFSWatcherHandles();
+    console.log(`  Cycle ${i + 1} - handles during: ${during}`);
+    await watcher.close();
+    await delay(500);
+  }
+
+  const handlesAfter = countFSWatcherHandles();
+  const leaked = handlesAfter - handlesBefore;
+  console.log(`Handles after 3 cycles: ${handlesAfter} (leaked: ${leaked})`);
+
+  expect(leaked).toEqual(0);
+});
+
+export default tap.start();
--- a/test/test.inode.ts
+++ b/test/test.inode.ts
@@ -0,0 +1,149 @@
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import * as smartwatch from '../ts/index.js';
+import * as smartrx from '@push.rocks/smartrx';
+
+import * as fs from 'fs';
+import * as path from 'path';
+
+// Skip in CI
+if (process.env.CI) {
+  process.exit(0);
+}
+
+const TEST_DIR = './test/assets';
+
+// Helper to delay
+const delay = (ms: number) => new Promise<void>((resolve) => setTimeout(resolve, ms));
+
+// Helper to wait for an event with timeout (filters by filename)
+async function waitForFileEvent<T extends [string, ...any[]]>(
+  observable: smartrx.rxjs.Observable<T>,
+  expectedFile: string,
+  timeoutMs: number = 5000
+): Promise<T> {
+  return new Promise((resolve, reject) => {
+    const timeout = setTimeout(() => {
+      subscription.unsubscribe();
+      reject(new Error(`Timeout waiting for event on ${expectedFile} after ${timeoutMs}ms`));
+    }, timeoutMs);
+
+    const subscription = observable.subscribe((value) => {
+      const [filePath] = value;
+      if (filePath.includes(expectedFile)) {
+        clearTimeout(timeout);
+        subscription.unsubscribe();
+        resolve(value);
+      }
+    });
+  });
+}
+
+let testSmartwatch: smartwatch.Smartwatch;
+
+// ===========================================
+// INODE CHANGE DETECTION TESTS
+// ===========================================
+
+tap.test('setup: start watcher', async () => {
+  testSmartwatch = new smartwatch.Smartwatch([`${TEST_DIR}/**/*.txt`]);
+  await testSmartwatch.start();
+  expect(testSmartwatch.status).toEqual('watching');
+  // Wait for chokidar to be ready
+  await delay(500);
+});
+
+tap.test('should detect delete+recreate as change event (atomic handling)', async () => {
+  // Chokidar with atomic: true handles delete+recreate as a single change event
+  // This is the expected behavior for editor save patterns
+  const testFile = path.join(TEST_DIR, 'inode-test.txt');
+
+  // Clean up any leftover file from previous runs
+  try { await fs.promises.unlink(testFile); } catch {}
+  await delay(100);
+
+  // Create initial file
+  await fs.promises.writeFile(testFile, 'initial content');
+  await delay(300);
+
+  // Get the initial inode
+  const initialStats = await fs.promises.stat(testFile);
+  const initialInode = initialStats.ino;
+  console.log(`[test] Initial inode: ${initialInode}`);
+
+  // Chokidar's atomic handling will emit a single 'change' event
+  const changeObservable = await testSmartwatch.getObservableFor('change');
+  const eventPromise = waitForFileEvent(changeObservable, 'inode-test.txt', 3000);
+
+  // Delete and recreate (this creates a new inode)
+  await fs.promises.unlink(testFile);
+  await fs.promises.writeFile(testFile, 'recreated content');
+
+  // Check inode changed
+  const newStats = await fs.promises.stat(testFile);
+  const newInode = newStats.ino;
+  console.log(`[test] New inode: ${newInode}`);
+  expect(newInode).not.toEqual(initialInode);
+
+  // Chokidar detects this as a change (atomic write pattern)
+  const [filePath] = await eventPromise;
+  expect(filePath).toInclude('inode-test.txt');
+  console.log(`[test] Detected change event for delete+recreate (atomic handling)`);
+
+  // Cleanup
+  await fs.promises.unlink(testFile);
+  await delay(200);
+});
+
+tap.test('should detect atomic write pattern (temp file + rename)', async () => {
+  // This simulates what Claude Code and many editors do:
+  // 1. Write to temp file (file.txt.tmp.12345)
+  // 2. Rename temp file to target file
+  const testFile = path.join(TEST_DIR, 'atomic-test.txt');
+  const tempFile = path.join(TEST_DIR, 'atomic-test.txt.tmp.12345');
+
+  // Create initial file
+  await fs.promises.writeFile(testFile, 'initial content');
+  await delay(300);
+
+  // Listen for both change and add events — different watcher backends
+  // may report a rename-over-existing as either a change or an add
+  const changeObservable = await testSmartwatch.getObservableFor('change');
+  const addObservable = await testSmartwatch.getObservableFor('add');
+
+  const eventPromise = Promise.race([
+    waitForFileEvent(changeObservable, 'atomic-test.txt', 3000),
+    waitForFileEvent(addObservable, 'atomic-test.txt', 3000),
+  ]);
+
+  // Atomic write: create temp file then rename
+  await fs.promises.writeFile(tempFile, 'atomic content');
+  await fs.promises.rename(tempFile, testFile);
+
+  // Should detect the event on the target file
+  const [filePath] = await eventPromise;
+  expect(filePath).toInclude('atomic-test.txt');
+  expect(filePath).not.toInclude('.tmp.');
+
+  // Cleanup
+  await fs.promises.unlink(testFile);
+});
+
+tap.test('teardown: stop watcher', async () => {
+  await testSmartwatch.stop();
+  expect(testSmartwatch.status).toEqual('idle');
+});
+
+tap.test('cleanup: remove test files', async () => {
+  const files = await fs.promises.readdir(TEST_DIR);
+  for (const file of files) {
+    if (file.startsWith('inode-') || file.startsWith('atomic-')) {
+      try {
+        await fs.promises.unlink(path.join(TEST_DIR, file));
+      } catch {
+        // Ignore
+      }
+    }
+  }
+});
+
+export default tap.start();
--- a/test/test.platform.bun.ts
+++ b/test/test.platform.bun.ts
@@ -0,0 +1,115 @@
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import { NodeWatcher } from '../ts/watchers/watcher.node.js';
+import type { IWatchEvent } from '../ts/watchers/interfaces.js';
+import * as path from 'path';
+import * as fs from 'fs';
+
+// Bun uses NodeWatcher (Node.js compatibility layer).
+// This test validates that the chokidar-based watcher works under Bun.
+const isBun = typeof (globalThis as any).Bun !== 'undefined';
+
+const TEST_DIR = path.resolve('./test/assets');
+const delay = (ms: number) => new Promise<void>((r) => setTimeout(r, ms));
+
+function waitForEvent(
+  watcher: { events$: { subscribe: Function } },
+  filter: (e: IWatchEvent) => boolean,
+  timeoutMs = 5000
+): Promise<IWatchEvent> {
+  return new Promise((resolve, reject) => {
+    const timeout = setTimeout(() => {
+      sub.unsubscribe();
+      reject(new Error(`Timeout waiting for event after ${timeoutMs}ms`));
+    }, timeoutMs);
+    const sub = watcher.events$.subscribe((event: IWatchEvent) => {
+      if (filter(event)) {
+        clearTimeout(timeout);
+        sub.unsubscribe();
+        resolve(event);
+      }
+    });
+  });
+}
+
+let watcher: NodeWatcher;
+
+tap.test('BunNodeWatcher: should create and start', async () => {
+  if (!isBun) { console.log('Skipping: not Bun runtime'); return; }
+  watcher = new NodeWatcher({
+    basePaths: [TEST_DIR],
+    depth: 4,
+    followSymlinks: false,
+    debounceMs: 100,
+  });
+  expect(watcher.isWatching).toBeFalse();
+  await watcher.start();
+  expect(watcher.isWatching).toBeTrue();
+  await delay(500);
+});
+
+tap.test('BunNodeWatcher: should detect file creation', async () => {
+  if (!isBun) return;
+  const file = path.join(TEST_DIR, 'bun-add-test.txt');
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'add' && e.path.includes('bun-add-test.txt'));
+  await fs.promises.writeFile(file, 'bun watcher test');
+  const event = await eventPromise;
+  expect(event.type).toEqual('add');
+  expect(event.path).toInclude('bun-add-test.txt');
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('BunNodeWatcher: should detect file modification', async () => {
+  if (!isBun) return;
+  const file = path.join(TEST_DIR, 'bun-change-test.txt');
+  await fs.promises.writeFile(file, 'initial');
+  await delay(300);
+
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'change' && e.path.includes('bun-change-test.txt'));
+  await fs.promises.writeFile(file, 'modified');
+  const event = await eventPromise;
+  expect(event.type).toEqual('change');
+
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('BunNodeWatcher: should detect file deletion', async () => {
+  if (!isBun) return;
+  const file = path.join(TEST_DIR, 'bun-unlink-test.txt');
+  await fs.promises.writeFile(file, 'to delete');
+  await delay(300);
+
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'unlink' && e.path.includes('bun-unlink-test.txt'));
+  await fs.promises.unlink(file);
+  const event = await eventPromise;
+  expect(event.type).toEqual('unlink');
+});
+
+tap.test('BunNodeWatcher: should detect directory creation', async () => {
+  if (!isBun) return;
+  const dir = path.join(TEST_DIR, 'bun-test-subdir');
+  const addDirPromise = waitForEvent(watcher, (e) => e.type === 'addDir' && e.path.includes('bun-test-subdir'));
+  await fs.promises.mkdir(dir, { recursive: true });
+  const event = await addDirPromise;
+  expect(event.type).toEqual('addDir');
+  await delay(200);
+  await fs.promises.rmdir(dir);
+  await delay(200);
+});
+
+tap.test('BunNodeWatcher: should not be watching after stop', async () => {
+  if (!isBun) return;
+  await watcher.stop();
+  expect(watcher.isWatching).toBeFalse();
+});
+
+tap.test('BunNodeWatcher: cleanup', async () => {
+  if (!isBun) return;
+  for (const name of ['bun-add-test.txt', 'bun-change-test.txt', 'bun-unlink-test.txt']) {
+    try { await fs.promises.unlink(path.join(TEST_DIR, name)); } catch {}
+  }
+  try { await fs.promises.rmdir(path.join(TEST_DIR, 'bun-test-subdir')); } catch {}
+});
+
+export default tap.start();
--- a/test/test.platform.deno.ts
+++ b/test/test.platform.deno.ts
@@ -0,0 +1,119 @@
+// tstest:deno:allowAll
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import type { IWatchEvent } from '../ts/watchers/interfaces.js';
+import * as path from 'node:path';
+import * as fs from 'node:fs';
+
+// This test requires the Deno runtime
+const isDeno = typeof (globalThis as any).Deno !== 'undefined';
+
+const TEST_DIR = path.resolve('./test/assets');
+const delay = (ms: number) => new Promise<void>((r) => setTimeout(r, ms));
+
+function waitForEvent(
+  watcher: { events$: { subscribe: Function } },
+  filter: (e: IWatchEvent) => boolean,
+  timeoutMs = 5000
+): Promise<IWatchEvent> {
+  return new Promise((resolve, reject) => {
+    const timeout = setTimeout(() => {
+      sub.unsubscribe();
+      reject(new Error(`Timeout waiting for event after ${timeoutMs}ms`));
+    }, timeoutMs);
+    const sub = watcher.events$.subscribe((event: IWatchEvent) => {
+      if (filter(event)) {
+        clearTimeout(timeout);
+        sub.unsubscribe();
+        resolve(event);
+      }
+    });
+  });
+}
+
+let watcher: any;
+
+tap.test('DenoWatcher: should create and start', async () => {
+  if (!isDeno) { console.log('Skipping: not Deno runtime'); return; }
+  const { DenoWatcher } = await import('../ts/watchers/watcher.deno.js');
+  watcher = new DenoWatcher({
+    basePaths: [TEST_DIR],
+    depth: 4,
+    followSymlinks: false,
+    debounceMs: 100,
+  });
+  expect(watcher.isWatching).toBeFalse();
+  await watcher.start();
+  expect(watcher.isWatching).toBeTrue();
+  await delay(500);
+});
+
+tap.test('DenoWatcher: should detect file creation', async () => {
+  if (!isDeno) return;
+  const file = path.join(TEST_DIR, 'deno-add-test.txt');
+  // Deno.watchFs may report new files as 'create', 'any', or 'modify' depending on platform
+  const eventPromise = waitForEvent(
+    watcher,
+    (e) => (e.type === 'add' || e.type === 'change') && e.path.includes('deno-add-test.txt'),
+    10000,
+  );
+  await fs.promises.writeFile(file, 'deno watcher test');
+  const event = await eventPromise;
+  expect(event.path).toInclude('deno-add-test.txt');
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('DenoWatcher: should detect file modification', async () => {
+  if (!isDeno) return;
+  const file = path.join(TEST_DIR, 'deno-change-test.txt');
+  await fs.promises.writeFile(file, 'initial');
+  await delay(300);
+
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'change' && e.path.includes('deno-change-test.txt'));
+  await fs.promises.writeFile(file, 'modified');
+  const event = await eventPromise;
+  expect(event.type).toEqual('change');
+
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('DenoWatcher: should detect file deletion', async () => {
+  if (!isDeno) return;
+  const file = path.join(TEST_DIR, 'deno-unlink-test.txt');
+  await fs.promises.writeFile(file, 'to delete');
+  await delay(300);
+
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'unlink' && e.path.includes('deno-unlink-test.txt'));
+  await fs.promises.unlink(file);
+  const event = await eventPromise;
+  expect(event.type).toEqual('unlink');
+});
+
+tap.test('DenoWatcher: should detect directory creation', async () => {
+  if (!isDeno) return;
+  const dir = path.join(TEST_DIR, 'deno-test-subdir');
+  const addDirPromise = waitForEvent(watcher, (e) => e.type === 'addDir' && e.path.includes('deno-test-subdir'));
+  await fs.promises.mkdir(dir, { recursive: true });
+  const event = await addDirPromise;
+  expect(event.type).toEqual('addDir');
+  await delay(200);
+  await fs.promises.rmdir(dir);
+  await delay(200);
+});
+
+tap.test('DenoWatcher: should not be watching after stop', async () => {
+  if (!isDeno) return;
+  await watcher.stop();
+  expect(watcher.isWatching).toBeFalse();
+});
+
+tap.test('DenoWatcher: cleanup', async () => {
+  if (!isDeno) return;
+  for (const name of ['deno-add-test.txt', 'deno-change-test.txt', 'deno-unlink-test.txt']) {
+    try { await fs.promises.unlink(path.join(TEST_DIR, name)); } catch {}
+  }
+  try { await fs.promises.rmdir(path.join(TEST_DIR, 'deno-test-subdir')); } catch {}
+});
+
+export default tap.start();
--- a/test/test.platform.node.ts
+++ b/test/test.platform.node.ts
@@ -0,0 +1,114 @@
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import { NodeWatcher } from '../ts/watchers/watcher.node.js';
+import type { IWatchEvent } from '../ts/watchers/interfaces.js';
+import * as path from 'path';
+import * as fs from 'fs';
+
+const TEST_DIR = path.resolve('./test/assets');
+const delay = (ms: number) => new Promise<void>((r) => setTimeout(r, ms));
+
+function waitForEvent(
+  watcher: { events$: { subscribe: Function } },
+  filter: (e: IWatchEvent) => boolean,
+  timeoutMs = 5000
+): Promise<IWatchEvent> {
+  return new Promise((resolve, reject) => {
+    const timeout = setTimeout(() => {
+      sub.unsubscribe();
+      reject(new Error(`Timeout waiting for event after ${timeoutMs}ms`));
+    }, timeoutMs);
+    const sub = watcher.events$.subscribe((event: IWatchEvent) => {
+      if (filter(event)) {
+        clearTimeout(timeout);
+        sub.unsubscribe();
+        resolve(event);
+      }
+    });
+  });
+}
+
+let watcher: NodeWatcher;
+
+tap.test('NodeWatcher: should create and start', async () => {
+  watcher = new NodeWatcher({
+    basePaths: [TEST_DIR],
+    depth: 4,
+    followSymlinks: false,
+    debounceMs: 100,
+  });
+  expect(watcher.isWatching).toBeFalse();
+  await watcher.start();
+  expect(watcher.isWatching).toBeTrue();
+  await delay(500);
+});
+
+tap.test('NodeWatcher: should emit ready event', async () => {
+  // Ready event fires during start, so we test isWatching as proxy
+  expect(watcher.isWatching).toBeTrue();
+});
+
+tap.test('NodeWatcher: should detect file creation', async () => {
+  const file = path.join(TEST_DIR, 'node-add-test.txt');
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'add' && e.path.includes('node-add-test.txt'));
+  await fs.promises.writeFile(file, 'node watcher test');
+  const event = await eventPromise;
+  expect(event.type).toEqual('add');
+  expect(event.path).toInclude('node-add-test.txt');
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('NodeWatcher: should detect file modification', async () => {
+  const file = path.join(TEST_DIR, 'node-change-test.txt');
+  await fs.promises.writeFile(file, 'initial');
+  await delay(300);
+
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'change' && e.path.includes('node-change-test.txt'));
+  await fs.promises.writeFile(file, 'modified');
+  const event = await eventPromise;
+  expect(event.type).toEqual('change');
+
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('NodeWatcher: should detect file deletion', async () => {
+  const file = path.join(TEST_DIR, 'node-unlink-test.txt');
+  await fs.promises.writeFile(file, 'to delete');
+  await delay(300);
+
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'unlink' && e.path.includes('node-unlink-test.txt'));
+  await fs.promises.unlink(file);
+  const event = await eventPromise;
+  expect(event.type).toEqual('unlink');
+});
+
+tap.test('NodeWatcher: should detect directory creation and removal', async () => {
+  const dir = path.join(TEST_DIR, 'node-test-subdir');
+
+  const addDirPromise = waitForEvent(watcher, (e) => e.type === 'addDir' && e.path.includes('node-test-subdir'));
+  await fs.promises.mkdir(dir, { recursive: true });
+  const addEvent = await addDirPromise;
+  expect(addEvent.type).toEqual('addDir');
+
+  await delay(200);
+
+  const unlinkDirPromise = waitForEvent(watcher, (e) => e.type === 'unlinkDir' && e.path.includes('node-test-subdir'));
+  await fs.promises.rmdir(dir);
+  const unlinkEvent = await unlinkDirPromise;
+  expect(unlinkEvent.type).toEqual('unlinkDir');
+});
+
+tap.test('NodeWatcher: should not be watching after stop', async () => {
+  await watcher.stop();
+  expect(watcher.isWatching).toBeFalse();
+});
+
+tap.test('NodeWatcher: cleanup', async () => {
+  for (const name of ['node-add-test.txt', 'node-change-test.txt', 'node-unlink-test.txt']) {
+    try { await fs.promises.unlink(path.join(TEST_DIR, name)); } catch {}
+  }
+  try { await fs.promises.rmdir(path.join(TEST_DIR, 'node-test-subdir')); } catch {}
+});
+
+export default tap.start();
--- a/test/test.platform.rust.bun.ts
+++ b/test/test.platform.rust.bun.ts
@@ -0,0 +1,112 @@
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import { RustWatcher } from '../ts/watchers/watcher.rust.js';
+import type { IWatchEvent } from '../ts/watchers/interfaces.js';
+import * as path from 'path';
+import * as fs from 'fs';
+
+// This test validates the Rust watcher running under the Bun runtime.
+const isBun = typeof (globalThis as any).Bun !== 'undefined';
+
+const TEST_DIR = path.resolve('./test/assets');
+const delay = (ms: number) => new Promise<void>((r) => setTimeout(r, ms));
+
+function waitForEvent(
+  watcher: { events$: { subscribe: Function } },
+  filter: (e: IWatchEvent) => boolean,
+  timeoutMs = 5000
+): Promise<IWatchEvent> {
+  return new Promise((resolve, reject) => {
+    const timeout = setTimeout(() => {
+      sub.unsubscribe();
+      reject(new Error(`Timeout waiting for event after ${timeoutMs}ms`));
+    }, timeoutMs);
+    const sub = watcher.events$.subscribe((event: IWatchEvent) => {
+      if (filter(event)) {
+        clearTimeout(timeout);
+        sub.unsubscribe();
+        resolve(event);
+      }
+    });
+  });
+}
+
+let available = false;
+
+tap.test('RustWatcher (Bun): check availability', async () => {
+  if (!isBun) { console.log('Skipping: not Bun runtime'); return; }
+  available = await RustWatcher.isAvailable();
+  console.log(`[test] Rust binary available: ${available}`);
+  if (!available) {
+    console.log('[test] Skipping Rust watcher tests — binary not found');
+  }
+});
+
+let watcher: RustWatcher;
+
+tap.test('RustWatcher (Bun): should create and start', async () => {
+  if (!isBun || !available) return;
+  watcher = new RustWatcher({
+    basePaths: [TEST_DIR],
+    depth: 4,
+    followSymlinks: false,
+    debounceMs: 100,
+  });
+  expect(watcher.isWatching).toBeFalse();
+  await watcher.start();
+  expect(watcher.isWatching).toBeTrue();
+  await delay(300);
+});
+
+tap.test('RustWatcher (Bun): should detect file creation', async () => {
+  if (!isBun || !available) return;
+  const file = path.join(TEST_DIR, 'rust-bun-add.txt');
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'add' && e.path.includes('rust-bun-add.txt'));
+  await fs.promises.writeFile(file, 'rust bun add test');
+  const event = await eventPromise;
+  expect(event.type).toEqual('add');
+  expect(event.path).toInclude('rust-bun-add.txt');
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('RustWatcher (Bun): should detect file modification', async () => {
+  if (!isBun || !available) return;
+  const file = path.join(TEST_DIR, 'rust-bun-change.txt');
+  await fs.promises.writeFile(file, 'initial');
+  await delay(300);
+
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'change' && e.path.includes('rust-bun-change.txt'));
+  await fs.promises.writeFile(file, 'modified');
+  const event = await eventPromise;
+  expect(event.type).toEqual('change');
+
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('RustWatcher (Bun): should detect file deletion', async () => {
+  if (!isBun || !available) return;
+  const file = path.join(TEST_DIR, 'rust-bun-unlink.txt');
+  await fs.promises.writeFile(file, 'to delete');
+  await delay(300);
+
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'unlink' && e.path.includes('rust-bun-unlink.txt'));
+  await fs.promises.unlink(file);
+  const event = await eventPromise;
+  expect(event.type).toEqual('unlink');
+});
+
+tap.test('RustWatcher (Bun): should not be watching after stop', async () => {
+  if (!isBun || !available) return;
+  await watcher.stop();
+  expect(watcher.isWatching).toBeFalse();
+});
+
+tap.test('RustWatcher (Bun): cleanup', async () => {
+  if (!isBun) return;
+  for (const name of ['rust-bun-add.txt', 'rust-bun-change.txt', 'rust-bun-unlink.txt']) {
+    try { await fs.promises.unlink(path.join(TEST_DIR, name)); } catch {}
+  }
+});
+
+export default tap.start();
--- a/test/test.platform.rust.deno.ts
+++ b/test/test.platform.rust.deno.ts
@@ -0,0 +1,122 @@
+// tstest:deno:allowAll
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import { RustWatcher } from '../ts/watchers/watcher.rust.js';
+import type { IWatchEvent } from '../ts/watchers/interfaces.js';
+import * as path from 'node:path';
+import * as fs from 'node:fs';
+
+// This test validates the Rust watcher running under the Deno runtime.
+const isDeno = typeof (globalThis as any).Deno !== 'undefined';
+
+const TEST_DIR = path.resolve('./test/assets');
+const delay = (ms: number) => new Promise<void>((r) => setTimeout(r, ms));
+
+function waitForEvent(
+  watcher: { events$: { subscribe: Function } },
+  filter: (e: IWatchEvent) => boolean,
+  timeoutMs = 5000
+): Promise<IWatchEvent> {
+  return new Promise((resolve, reject) => {
+    const timeout = setTimeout(() => {
+      sub.unsubscribe();
+      reject(new Error(`Timeout waiting for event after ${timeoutMs}ms`));
+    }, timeoutMs);
+    const sub = watcher.events$.subscribe((event: IWatchEvent) => {
+      if (filter(event)) {
+        clearTimeout(timeout);
+        sub.unsubscribe();
+        resolve(event);
+      }
+    });
+  });
+}
+
+let available = false;
+
+tap.test('RustWatcher (Deno): check availability', async () => {
+  if (!isDeno) { console.log('Skipping: not Deno runtime'); return; }
+  available = await RustWatcher.isAvailable();
+  console.log(`[test] Rust binary available: ${available}`);
+  if (!available) {
+    console.log('[test] Skipping Rust watcher tests — binary not found');
+  }
+});
+
+let watcher: RustWatcher;
+
+let started = false;
+
+tap.test('RustWatcher (Deno): should create and start', async () => {
+  if (!isDeno || !available) return;
+  watcher = new RustWatcher({
+    basePaths: [TEST_DIR],
+    depth: 4,
+    followSymlinks: false,
+    debounceMs: 100,
+  });
+  expect(watcher.isWatching).toBeFalse();
+  try {
+    await watcher.start();
+    started = true;
+    expect(watcher.isWatching).toBeTrue();
+    await delay(300);
+  } catch (err) {
+    // Deno may block child_process.spawn without --allow-run permission
+    console.log(`[test] RustWatcher spawn failed (likely Deno permission): ${err}`);
+    available = false;
+  }
+});
+
+tap.test('RustWatcher (Deno): should detect file creation', async () => {
+  if (!isDeno || !available) return;
+  const file = path.join(TEST_DIR, 'rust-deno-add.txt');
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'add' && e.path.includes('rust-deno-add.txt'));
+  await fs.promises.writeFile(file, 'rust deno add test');
+  const event = await eventPromise;
+  expect(event.type).toEqual('add');
+  expect(event.path).toInclude('rust-deno-add.txt');
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('RustWatcher (Deno): should detect file modification', async () => {
+  if (!isDeno || !available) return;
+  const file = path.join(TEST_DIR, 'rust-deno-change.txt');
+  await fs.promises.writeFile(file, 'initial');
+  await delay(300);
+
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'change' && e.path.includes('rust-deno-change.txt'));
+  await fs.promises.writeFile(file, 'modified');
+  const event = await eventPromise;
+  expect(event.type).toEqual('change');
+
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('RustWatcher (Deno): should detect file deletion', async () => {
+  if (!isDeno || !available) return;
+  const file = path.join(TEST_DIR, 'rust-deno-unlink.txt');
+  await fs.promises.writeFile(file, 'to delete');
+  await delay(300);
+
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'unlink' && e.path.includes('rust-deno-unlink.txt'));
+  await fs.promises.unlink(file);
+  const event = await eventPromise;
+  expect(event.type).toEqual('unlink');
+});
+
+tap.test('RustWatcher (Deno): should not be watching after stop', async () => {
+  if (!isDeno || !available) return;
+  await watcher.stop();
+  expect(watcher.isWatching).toBeFalse();
+});
+
+tap.test('RustWatcher (Deno): cleanup', async () => {
+  if (!isDeno) return;
+  for (const name of ['rust-deno-add.txt', 'rust-deno-change.txt', 'rust-deno-unlink.txt']) {
+    try { await fs.promises.unlink(path.join(TEST_DIR, name)); } catch {}
+  }
+});
+
+export default tap.start();
--- a/test/test.platform.rust.node.ts
+++ b/test/test.platform.rust.node.ts
@@ -0,0 +1,157 @@
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import { RustWatcher } from '../ts/watchers/watcher.rust.js';
+import type { IWatchEvent } from '../ts/watchers/interfaces.js';
+import * as path from 'path';
+import * as fs from 'fs';
+
+const TEST_DIR = path.resolve('./test/assets');
+const delay = (ms: number) => new Promise<void>((r) => setTimeout(r, ms));
+
+function waitForEvent(
+  watcher: { events$: { subscribe: Function } },
+  filter: (e: IWatchEvent) => boolean,
+  timeoutMs = 5000
+): Promise<IWatchEvent> {
+  return new Promise((resolve, reject) => {
+    const timeout = setTimeout(() => {
+      sub.unsubscribe();
+      reject(new Error(`Timeout waiting for event after ${timeoutMs}ms`));
+    }, timeoutMs);
+    const sub = watcher.events$.subscribe((event: IWatchEvent) => {
+      if (filter(event)) {
+        clearTimeout(timeout);
+        sub.unsubscribe();
+        resolve(event);
+      }
+    });
+  });
+}
+
+function collectEvents(
+  watcher: { events$: { subscribe: Function } },
+  filter: (e: IWatchEvent) => boolean,
+  durationMs: number
+): Promise<IWatchEvent[]> {
+  return new Promise((resolve) => {
+    const events: IWatchEvent[] = [];
+    const sub = watcher.events$.subscribe((event: IWatchEvent) => {
+      if (filter(event)) events.push(event);
+    });
+    setTimeout(() => { sub.unsubscribe(); resolve(events); }, durationMs);
+  });
+}
+
+let available = false;
+
+tap.test('RustWatcher (Node): check availability', async () => {
+  available = await RustWatcher.isAvailable();
+  console.log(`[test] Rust binary available: ${available}`);
+  if (!available) {
+    console.log('[test] Skipping Rust watcher tests — binary not found');
+  }
+});
+
+let watcher: RustWatcher;
+
+tap.test('RustWatcher (Node): should create and start', async () => {
+  if (!available) return;
+  watcher = new RustWatcher({
+    basePaths: [TEST_DIR],
+    depth: 4,
+    followSymlinks: false,
+    debounceMs: 100,
+  });
+  expect(watcher.isWatching).toBeFalse();
+  await watcher.start();
+  expect(watcher.isWatching).toBeTrue();
+  await delay(300);
+});
+
+tap.test('RustWatcher (Node): should emit initial add events', async () => {
+  if (!available) return;
+  // The initial scan should have emitted add events for existing files.
+  // We verify by creating a file and checking it gets an add event
+  const file = path.join(TEST_DIR, 'rust-node-add.txt');
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'add' && e.path.includes('rust-node-add.txt'));
+  await fs.promises.writeFile(file, 'rust node add test');
+  const event = await eventPromise;
+  expect(event.type).toEqual('add');
+  expect(event.path).toInclude('rust-node-add.txt');
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('RustWatcher (Node): should detect file modification', async () => {
+  if (!available) return;
+  const file = path.join(TEST_DIR, 'rust-node-change.txt');
+  await fs.promises.writeFile(file, 'initial');
+  await delay(300);
+
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'change' && e.path.includes('rust-node-change.txt'));
+  await fs.promises.writeFile(file, 'modified');
+  const event = await eventPromise;
+  expect(event.type).toEqual('change');
+
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('RustWatcher (Node): should detect file deletion', async () => {
+  if (!available) return;
+  const file = path.join(TEST_DIR, 'rust-node-unlink.txt');
+  await fs.promises.writeFile(file, 'to delete');
+  await delay(300);
+
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'unlink' && e.path.includes('rust-node-unlink.txt'));
+  await fs.promises.unlink(file);
+  const event = await eventPromise;
+  expect(event.type).toEqual('unlink');
+});
+
+tap.test('RustWatcher (Node): should detect directory creation', async () => {
+  if (!available) return;
+  const dir = path.join(TEST_DIR, 'rust-node-subdir');
+  const eventPromise = waitForEvent(watcher, (e) => e.type === 'addDir' && e.path.includes('rust-node-subdir'));
+  await fs.promises.mkdir(dir, { recursive: true });
+  const event = await eventPromise;
+  expect(event.type).toEqual('addDir');
+  await delay(200);
+  await fs.promises.rmdir(dir);
+  await delay(200);
+});
+
+tap.test('RustWatcher (Node): should handle rapid modifications', async () => {
+  if (!available) return;
+  const file = path.join(TEST_DIR, 'rust-node-rapid.txt');
+  await fs.promises.writeFile(file, 'initial');
+  await delay(200);
+
+  const collector = collectEvents(watcher, (e) => e.type === 'change' && e.path.includes('rust-node-rapid.txt'), 3000);
+
+  for (let i = 0; i < 10; i++) {
+    await fs.promises.writeFile(file, `content ${i}`);
+    await delay(10);
+  }
+
+  const events = await collector;
+  console.log(`[test] Rapid mods: 10 writes, ${events.length} events received`);
+  expect(events.length).toBeGreaterThan(0);
+
+  await fs.promises.unlink(file);
+  await delay(200);
+});
+
+tap.test('RustWatcher (Node): should not be watching after stop', async () => {
+  if (!available) return;
+  await watcher.stop();
+  expect(watcher.isWatching).toBeFalse();
+});
+
+tap.test('RustWatcher (Node): cleanup', async () => {
+  for (const name of ['rust-node-add.txt', 'rust-node-change.txt', 'rust-node-unlink.txt', 'rust-node-rapid.txt']) {
+    try { await fs.promises.unlink(path.join(TEST_DIR, name)); } catch {}
+  }
+  try { await fs.promises.rmdir(path.join(TEST_DIR, 'rust-node-subdir')); } catch {}
+});
+
+export default tap.start();
--- a/test/test.stress.ts
+++ b/test/test.stress.ts
@@ -0,0 +1,175 @@
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import * as smartwatch from '../ts/index.js';
+import * as smartrx from '@push.rocks/smartrx';
+
+import * as fs from 'fs';
+import * as path from 'path';
+
+// Skip in CI
+if (process.env.CI) {
+  process.exit(0);
+}
+
+const TEST_DIR = './test/assets';
+
+// Helper to delay
+const delay = (ms: number) => new Promise<void>((resolve) => setTimeout(resolve, ms));
+
+// Helper to collect events
+function collectEvents<T>(
+  observable: smartrx.rxjs.Observable<T>,
+  durationMs: number
+): Promise<T[]> {
+  return new Promise((resolve) => {
+    const events: T[] = [];
+    const subscription = observable.subscribe((value) => {
+      events.push(value);
+    });
+
+    setTimeout(() => {
+      subscription.unsubscribe();
+      resolve(events);
+    }, durationMs);
+  });
+}
+
+let testSmartwatch: smartwatch.Smartwatch;
+
+// ===========================================
+// STRESS TESTS
+// ===========================================
+
+tap.test('setup: start watcher', async () => {
+  testSmartwatch = new smartwatch.Smartwatch([`${TEST_DIR}/**/*.txt`]);
+  await testSmartwatch.start();
+  expect(testSmartwatch.status).toEqual('watching');
+  // Wait for chokidar to be ready
+  await delay(500);
+});
+
+tap.test('STRESS: rapid file modifications', async () => {
+  const testFile = path.join(TEST_DIR, 'stress-rapid.txt');
+
+  // Create initial file
+  await fs.promises.writeFile(testFile, 'initial');
+  await delay(200);
+
+  const changeObservable = await testSmartwatch.getObservableFor('change');
+
+  // Rapidly modify the file 20 times
+  const RAPID_CHANGES = 20;
+  const eventCollector = collectEvents(changeObservable, 3000);
+
+  for (let i = 0; i < RAPID_CHANGES; i++) {
+    await fs.promises.writeFile(testFile, `content ${i}`);
+    await delay(10); // 10ms between writes
+  }
+
+  const events = await eventCollector;
+  console.log(`[test] Rapid changes: sent ${RAPID_CHANGES}, received ${events.length} events`);
+
+  // Due to debouncing, we won't get all events, but we should get at least some
+  expect(events.length).toBeGreaterThan(0);
+
+  // Cleanup
+  await fs.promises.unlink(testFile);
+});
+
+tap.test('STRESS: many files created rapidly', async () => {
+  const FILE_COUNT = 20;
+  const files: string[] = [];
+
+  const addObservable = await testSmartwatch.getObservableFor('add');
+  const eventCollector = collectEvents(addObservable, 5000);
+
+  // Create many files rapidly
+  for (let i = 0; i < FILE_COUNT; i++) {
+    const file = path.join(TEST_DIR, `stress-many-${i}.txt`);
+    files.push(file);
+    await fs.promises.writeFile(file, `content ${i}`);
+    await delay(20); // 20ms between creates
+  }
+
+  const events = await eventCollector;
+  console.log(`[test] Many files: created ${FILE_COUNT}, detected ${events.length} events`);
+
+  // Should detect most or all files
+  expect(events.length).toBeGreaterThanOrEqual(FILE_COUNT * 0.8); // Allow 20% tolerance
+
+  // Cleanup all files
+  for (const file of files) {
+    try {
+      await fs.promises.unlink(file);
+    } catch {
+      // Ignore if already deleted
+    }
+  }
+});
+
+tap.test('STRESS: interleaved add/change/delete operations', async () => {
+  const testFiles = [
+    path.join(TEST_DIR, 'stress-interleave-1.txt'),
+    path.join(TEST_DIR, 'stress-interleave-2.txt'),
+    path.join(TEST_DIR, 'stress-interleave-3.txt'),
+  ];
+
+  // Create initial files
+  for (const file of testFiles) {
+    await fs.promises.writeFile(file, 'initial');
+  }
+  await delay(300);
+
+  const addObservable = await testSmartwatch.getObservableFor('add');
+  const changeObservable = await testSmartwatch.getObservableFor('change');
+  const unlinkObservable = await testSmartwatch.getObservableFor('unlink');
+
+  const addEvents = collectEvents(addObservable, 3000);
+  const changeEvents = collectEvents(changeObservable, 3000);
+  const unlinkEvents = collectEvents(unlinkObservable, 3000);
+
+  // Interleaved operations
+  await fs.promises.writeFile(testFiles[0], 'changed 1'); // change
+  await delay(50);
+  await fs.promises.unlink(testFiles[1]); // delete
+  await delay(50);
+  await fs.promises.writeFile(testFiles[1], 'recreated 1'); // add (recreate)
+  await delay(50);
+  await fs.promises.writeFile(testFiles[2], 'changed 2'); // change
+  await delay(50);
+
+  const [adds, changes, unlinks] = await Promise.all([addEvents, changeEvents, unlinkEvents]);
+
+  console.log(`[test] Interleaved: adds=${adds.length}, changes=${changes.length}, unlinks=${unlinks.length}`);
+
+  // Should have detected some events of each type
+  expect(changes.length).toBeGreaterThan(0);
+
+  // Cleanup
+  for (const file of testFiles) {
+    try {
+      await fs.promises.unlink(file);
+    } catch {
+      // Ignore
+    }
+  }
+});
+
+tap.test('teardown: stop watcher', async () => {
+  await testSmartwatch.stop();
+  expect(testSmartwatch.status).toEqual('idle');
+});
+
+tap.test('cleanup: remove stress test files', async () => {
+  const files = await fs.promises.readdir(TEST_DIR);
+  for (const file of files) {
+    if (file.startsWith('stress-')) {
+      try {
+        await fs.promises.unlink(path.join(TEST_DIR, file));
+      } catch {
+        // Ignore
+      }
+    }
+  }
+});
+
+export default tap.start();
--- a/test/test.ts
+++ b/test/test.ts
@@ -1,50 +0,0 @@
-import { tap, expect } from '@git.zone/tstest/tapbundle';
-import * as smartwatch from '../ts/index.js';
-import * as smartfile from '@push.rocks/smartfile';
-import * as smartpromise from '@push.rocks/smartpromise';
-import * as smartrx from '@push.rocks/smartrx';
-
-import * as fs from 'fs';
-
-// the module to test
-if (process.env.CI) {
-  process.exit(0);
-}
-
-let testSmartwatch: smartwatch.Smartwatch;
-let testAddObservable: smartrx.rxjs.Observable<[string, fs.Stats]>;
-let testSubscription: smartrx.rxjs.Subscription;
-tap.test('should create a new instance', async () => {
-  testSmartwatch = new smartwatch.Smartwatch([]);
-  expect(testSmartwatch).toBeInstanceOf(smartwatch.Smartwatch);
-});
-
-tap.test('should add some files to watch and start', async () => {
-  testSmartwatch.add(['./test/**/*.txt']);
-  await testSmartwatch.start()
-  testSmartwatch.add(['./test/**/*.md']);
-});
-
-tap.test('should get an observable for a certain event', async () => {
-  await testSmartwatch.getObservableFor('add').then(async (observableArg) => {
-    testAddObservable = observableArg;
-  });
-});
-
-tap.test('should register an add operation', async () => {
-  let testDeferred = smartpromise.defer();
-  testSubscription = testAddObservable.subscribe(pathArg => {
-    const pathResult = pathArg[0];
-    console.log(pathResult);
-    testDeferred.resolve();
-  });
-  smartfile.memory.toFs('HI', './test/assets/hi.txt');
-  await testDeferred.promise;
-});
-
-tap.test('should stop the watch process', async (tools) => {
-  await tools.delayFor(10000);
-  testSmartwatch.stop();
-});
-
-export default tap.start();
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
 */
 export const commitinfo = {
  name: '@push.rocks/smartwatch',
-  version: '6.1.1',
+  version: '6.4.0',
  description: 'A cross-runtime file watcher with glob pattern support for Node.js, Deno, and Bun.'
 }
--- a/ts/smartwatch.plugins.ts
+++ b/ts/smartwatch.plugins.ts
@@ -10,12 +10,14 @@ export {
 // @pushrocks scope
 import * as lik from '@push.rocks/lik';
 import * as smartpromise from '@push.rocks/smartpromise';
+import * as smartrust from '@push.rocks/smartrust';
 import * as smartrx from '@push.rocks/smartrx';
 import { Smartenv } from '@push.rocks/smartenv';

 export {
  lik,
  smartpromise,
+  smartrust,
  smartrx,
  Smartenv
 }
--- a/ts/watchers/index.ts
+++ b/ts/watchers/index.ts
@@ -4,18 +4,27 @@ import type { IWatcher, IWatcherOptions, IWatchEvent, TWatchEventType } from './
 export type { IWatcher, IWatcherOptions, IWatchEvent, TWatchEventType };

 /**
- * Creates a platform-appropriate file watcher based on the current runtime
- * Uses @push.rocks/smartenv for runtime detection
+ * Creates a file watcher, preferring the Rust backend when available.
+ * Falls back to chokidar (Node.js/Bun) or Deno.watchFs based on runtime.
 */
 export async function createWatcher(options: IWatcherOptions): Promise<IWatcher> {
+  // Try Rust watcher first (works on all runtimes via smartrust IPC)
+  try {
+    const { RustWatcher } = await import('./watcher.rust.js');
+    if (await RustWatcher.isAvailable()) {
+      return new RustWatcher(options);
+    }
+  } catch {
+    // Rust watcher not available, fall back
+  }
+
+  // Fall back to runtime-specific watchers
  const env = new Smartenv();

  if (env.isDeno) {
-    // Deno runtime - use Deno.watchFs
    const { DenoWatcher } = await import('./watcher.deno.js');
    return new DenoWatcher(options);
  } else {
-    // Node.js or Bun - both use fs.watch (Bun has Node.js compatibility)
    const { NodeWatcher } = await import('./watcher.node.js');
    return new NodeWatcher(options);
  }
--- a/ts/watchers/interfaces.ts
+++ b/ts/watchers/interfaces.ts
@@ -28,6 +28,12 @@ export interface IWatcherOptions {
  followSymlinks: boolean;
  /** Debounce time in ms - events for the same file within this window are coalesced */
  debounceMs: number;
+  /** Whether to wait for writes to stabilize before emitting events */
+  awaitWriteFinish?: boolean;
+  /** How long file size must remain constant before emitting event (ms) */
+  stabilityThreshold?: number;
+  /** How often to poll file size during write detection (ms) */
+  pollInterval?: number;
 }

 /**
--- a/ts/watchers/watcher.deno.ts
+++ b/ts/watchers/watcher.deno.ts
@@ -218,6 +218,30 @@ export class DenoWatcher implements IWatcher {
          type: wasDirectory ? 'unlinkDir' : 'unlink',
          path: filePath
        });
+      } else if (kind === 'any' || kind === 'other') {
+        // Deno may emit 'any' for various operations — determine the actual type
+        const stats = await this.statSafe(filePath);
+        if (stats) {
+          if (this.watchedFiles.has(filePath)) {
+            // Known file → treat as change
+            if (!stats.isDirectory()) {
+              this.events$.next({ type: 'change', path: filePath, stats });
+            }
+          } else {
+            // New file → treat as add
+            this.watchedFiles.add(filePath);
+            const eventType: TWatchEventType = stats.isDirectory() ? 'addDir' : 'add';
+            this.events$.next({ type: eventType, path: filePath, stats });
+          }
+        } else {
+          // File no longer exists → treat as remove
+          const wasDirectory = this.isKnownDirectory(filePath);
+          this.watchedFiles.delete(filePath);
+          this.events$.next({
+            type: wasDirectory ? 'unlinkDir' : 'unlink',
+            path: filePath
+          });
+        }
      }
    } catch (error: any) {
      this.events$.next({ type: 'error', path: filePath, error });
--- a/ts/watchers/watcher.node.ts
+++ b/ts/watchers/watcher.node.ts
@@ -1,168 +1,33 @@
 import * as fs from 'fs';
 import * as path from 'path';
 import * as smartrx from '@push.rocks/smartrx';
-import type { IWatcher, IWatcherOptions, IWatchEvent, TWatchEventType } from './interfaces.js';
+import * as chokidar from 'chokidar';
+import type { IWatcher, IWatcherOptions, IWatchEvent } from './interfaces.js';

 /**
- * Node.js/Bun file watcher using native fs.watch API
+ * Node.js/Bun file watcher using chokidar
+ *
+ * Chokidar handles all the edge cases:
+ * - Atomic writes (temp file + rename)
+ * - Inode tracking
+ * - Cross-platform differences
+ * - Debouncing
+ * - Write stabilization
 */
 export class NodeWatcher implements IWatcher {
-  private watchers: Map<string, fs.FSWatcher> = new Map();
-  private watchedFiles: Set<string> = new Set();
+  private watcher: chokidar.FSWatcher | null = null;
  private _isWatching = false;
-
-  // Debounce: pending emits per file path
-  private pendingEmits: Map<string, NodeJS.Timeout> = new Map();
-
-  // Restart tracking
-  private restartDelays: Map<string, number> = new Map();
-  private restartAttempts: Map<string, number> = new Map();
-  private healthCheckInterval: NodeJS.Timeout | null = null;
-
-  // Inode tracking - detect when directories are replaced (atomic saves, etc.)
-  // fs.watch watches the inode, not the path. If inode changes, we need to restart.
-  private watchedInodes: Map<string, bigint> = new Map();
-
-  // Configuration constants
-  private static readonly MAX_RETRIES = 3;
-  private static readonly INITIAL_RESTART_DELAY = 1000;
-  private static readonly MAX_RESTART_DELAY = 30000;
-  private static readonly HEALTH_CHECK_INTERVAL = 30000;
+  private _preExistingHandles: Set<any> = new Set();

  public readonly events$ = new smartrx.rxjs.Subject<IWatchEvent>();

  constructor(private options: IWatcherOptions) {}

-  /**
-   * Safely emit an event, catching any subscriber errors
-   */
-  private safeEmit(event: IWatchEvent): void {
-    try {
-      this.events$.next(event);
-    } catch (error) {
-      console.error('[smartwatch] Subscriber threw error (isolated):', error);
-      // Don't let subscriber errors kill the watcher
-    }
-  }
-
-  /**
-   * Restart a watcher after an error with exponential backoff
-   */
-  private async restartWatcher(basePath: string, error: Error): Promise<void> {
-    const attempts = (this.restartAttempts.get(basePath) || 0) + 1;
-    this.restartAttempts.set(basePath, attempts);
-
-    console.log(`[smartwatch] Watcher error for ${basePath}: ${error.message}`);
-    console.log(`[smartwatch] Restart attempt ${attempts}/${NodeWatcher.MAX_RETRIES}`);
-
-    if (attempts > NodeWatcher.MAX_RETRIES) {
-      console.error(`[smartwatch] Max retries exceeded for ${basePath}, giving up`);
-      this.safeEmit({
-        type: 'error',
-        path: basePath,
-        error: new Error(`Max restart retries (${NodeWatcher.MAX_RETRIES}) exceeded`)
-      });
-      return;
-    }
-
-    // Close failed watcher
-    const oldWatcher = this.watchers.get(basePath);
-    if (oldWatcher) {
-      try {
-        oldWatcher.close();
-      } catch {
-        // Ignore close errors
-      }
-      this.watchers.delete(basePath);
-    }
-
-    // Exponential backoff
-    const delay = this.restartDelays.get(basePath) || NodeWatcher.INITIAL_RESTART_DELAY;
-    console.log(`[smartwatch] Waiting ${delay}ms before restart...`);
-    await new Promise((resolve) => setTimeout(resolve, delay));
-    this.restartDelays.set(basePath, Math.min(delay * 2, NodeWatcher.MAX_RESTART_DELAY));
-
-    try {
-      await this.watchPath(basePath, 0);
-      console.log(`[smartwatch] Successfully restarted watcher for ${basePath}`);
-      this.restartDelays.set(basePath, NodeWatcher.INITIAL_RESTART_DELAY);
-      this.restartAttempts.set(basePath, 0);
-    } catch (restartError) {
-      console.error(`[smartwatch] Restart failed for ${basePath}:`, restartError);
-      this.restartWatcher(basePath, restartError as Error); // Recursive retry
-    }
-  }
-
-  /**
-   * Start periodic health checks to detect silent failures
-   * Checks for:
-   * 1. Path no longer exists
-   * 2. Inode changed (directory was replaced - fs.watch watches inode, not path!)
-   */
-  private startHealthCheck(): void {
-    console.log('[smartwatch] Starting health check (every 30s)');
-    this.healthCheckInterval = setInterval(async () => {
-      console.log(`[smartwatch] Health check: ${this.watchers.size} watchers active`);
-      for (const [basePath] of this.watchers) {
-        try {
-          const stats = await fs.promises.stat(basePath);
-          const currentInode = stats.ino;
-          const previousInode = this.watchedInodes.get(basePath);
-
-          if (!stats) {
-            console.error(`[smartwatch] Health check failed: ${basePath} no longer exists`);
-            this.safeEmit({
-              type: 'error',
-              path: basePath,
-              error: new Error('Watched path no longer exists')
-            });
-            this.restartWatcher(basePath, new Error('Watched path disappeared'));
-          } else if (previousInode !== undefined && BigInt(currentInode) !== previousInode) {
-            // CRITICAL: Inode changed! fs.watch is now watching a stale inode.
-            // This happens when the directory is replaced (atomic operations, git checkout, etc.)
-            console.warn(`[smartwatch] Inode changed for ${basePath}: ${previousInode} -> ${currentInode}`);
-            console.warn('[smartwatch] fs.watch watches inode, not path - restarting watcher');
-            this.restartWatcher(basePath, new Error('Inode changed - directory was replaced'));
-          }
-        } catch (error: any) {
-          if (error.code === 'ENOENT') {
-            console.error(`[smartwatch] Health check failed: ${basePath} no longer exists`);
-            this.restartWatcher(basePath, new Error('Watched path disappeared'));
-          } else if (error.code === 'ENOSPC') {
-            // inotify watch limit exceeded - critical system issue
-            console.error(`[smartwatch] ENOSPC: inotify watch limit exceeded!`);
-            console.error('[smartwatch] Fix: echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p');
-            this.safeEmit({ type: 'error', path: basePath, error });
-          } else {
-            console.error(`[smartwatch] Health check error for ${basePath}:`, error);
-          }
-        }
-      }
-    }, NodeWatcher.HEALTH_CHECK_INTERVAL);
-  }
-
-  /**
-   * Stop health check interval
-   */
-  private stopHealthCheck(): void {
-    if (this.healthCheckInterval) {
-      clearInterval(this.healthCheckInterval);
-      this.healthCheckInterval = null;
-      console.log('[smartwatch] Stopped health check');
-    }
-  }
-
-  /**
-   * Check if a file is a temporary file created by editors
-   */
-  private isTemporaryFile(filePath: string): boolean {
-    const basename = path.basename(filePath);
-    // Editor temp files: *.tmp.*, *.swp, *.swx, *~, .#*
-    if (basename.includes('.tmp.')) return true;
-    if (basename.endsWith('.swp') || basename.endsWith('.swx')) return true;
-    if (basename.endsWith('~')) return true;
-    if (basename.startsWith('.#')) return true;
-    return false;
+  /** Collect all current FSWatcher handles from the process */
+  private _getFsWatcherHandles(): any[] {
+    return (process as any)._getActiveHandles().filter(
+      (h: any) => h?.constructor?.name === 'FSWatcher' && typeof h.unref === 'function'
+    );
  }

  get isWatching(): boolean {
@@ -170,31 +35,57 @@ export class NodeWatcher implements IWatcher {
  }

  async start(): Promise<void> {
-    if (this._isWatching) {
-      return;
-    }
+    if (this._isWatching) return;

-    console.log(`[smartwatch] Starting watcher for ${this.options.basePaths.length} base path(s)...`);
+    // Snapshot existing FSWatcher handles so we only unref ours on stop
+    this._preExistingHandles = new Set(this._getFsWatcherHandles());
+
+    console.log(`[smartwatch] Starting chokidar watcher for ${this.options.basePaths.length} base path(s)...`);

    try {
-      // Start watching each base path
-      for (const basePath of this.options.basePaths) {
-        await this.watchPath(basePath, 0);
-      }
+      // Resolve all paths to absolute
+      const absolutePaths = this.options.basePaths.map(p => path.resolve(p));
+
+      this.watcher = chokidar.watch(absolutePaths, {
+        persistent: true,
+        ignoreInitial: false,
+        followSymlinks: this.options.followSymlinks,
+        depth: this.options.depth,
+        atomic: true, // Handle atomic writes
+        awaitWriteFinish: this.options.awaitWriteFinish ? {
+          stabilityThreshold: this.options.stabilityThreshold || 300,
+          pollInterval: this.options.pollInterval || 100,
+        } : false,
+      });
+
+      // Wire up all events
+      this.watcher
+        .on('add', (filePath: string, stats?: fs.Stats) => {
+          this.safeEmit({ type: 'add', path: filePath, stats });
+        })
+        .on('change', (filePath: string, stats?: fs.Stats) => {
+          this.safeEmit({ type: 'change', path: filePath, stats });
+        })
+        .on('unlink', (filePath: string) => {
+          this.safeEmit({ type: 'unlink', path: filePath });
+        })
+        .on('addDir', (filePath: string, stats?: fs.Stats) => {
+          this.safeEmit({ type: 'addDir', path: filePath, stats });
+        })
+        .on('unlinkDir', (filePath: string) => {
+          this.safeEmit({ type: 'unlinkDir', path: filePath });
+        })
+        .on('error', (error: Error) => {
+          console.error('[smartwatch] Chokidar error:', error);
+          this.safeEmit({ type: 'error', path: '', error });
+        })
+        .on('ready', () => {
+          console.log('[smartwatch] Chokidar ready - initial scan complete');
+          this.safeEmit({ type: 'ready', path: '' });
+        });

      this._isWatching = true;
-
-      // Start health check monitoring
-      this.startHealthCheck();
-
-      // Perform initial scan to emit 'add' events for existing files
-      for (const basePath of this.options.basePaths) {
-        await this.scanDirectory(basePath, 0);
-      }
-
-      // Emit ready event
-      this.safeEmit({ type: 'ready', path: '' });
-      console.log(`[smartwatch] Watcher started with ${this.watchers.size} active watcher(s)`);
+      console.log('[smartwatch] Watcher started');
    } catch (error: any) {
      console.error('[smartwatch] Failed to start watcher:', error);
      this.safeEmit({ type: 'error', path: '', error });
@@ -204,262 +95,33 @@ export class NodeWatcher implements IWatcher {

  async stop(): Promise<void> {
    console.log('[smartwatch] Stopping watcher...');
+
+    if (this.watcher) {
+      await this.watcher.close();
+      this.watcher = null;
+    }
+
+    // Unref only FSWatcher handles created during our watch session.
+    // Chokidar v5 can orphan fs.watch() handles under heavy file churn,
+    // preventing process exit. We only touch handles that didn't exist
+    // before start() to avoid affecting other watchers in the process.
+    for (const handle of this._getFsWatcherHandles()) {
+      if (!this._preExistingHandles.has(handle)) {
+        handle.unref();
+      }
+    }
+    this._preExistingHandles.clear();
+
    this._isWatching = false;
-
-    // Stop health check monitoring
-    this.stopHealthCheck();
-
-    // Cancel all pending debounced emits
-    for (const timeout of this.pendingEmits.values()) {
-      clearTimeout(timeout);
-    }
-    this.pendingEmits.clear();
-
-    // Close all watchers
-    for (const [watchPath, watcher] of this.watchers) {
-      console.log(`[smartwatch] Closing watcher for: ${watchPath}`);
-      watcher.close();
-    }
-    this.watchers.clear();
-    this.watchedFiles.clear();
-
-    // Clear restart tracking state
-    this.restartDelays.clear();
-    this.restartAttempts.clear();
-    this.watchedInodes.clear();
-
    console.log('[smartwatch] Watcher stopped');
  }

-  /**
-   * Start watching a path (file or directory)
-   */
-  private async watchPath(watchPath: string, depth: number): Promise<void> {
-    if (depth > this.options.depth) {
-      return;
-    }
-
+  /** Safely emit an event, isolating subscriber errors */
+  private safeEmit(event: IWatchEvent): void {
    try {
-      const stats = await this.statSafe(watchPath);
-      if (!stats) {
-        return;
-      }
-
-      if (stats.isDirectory()) {
-        // Store inode for health check - fs.watch watches inode, not path!
-        // If inode changes (directory replaced), watcher becomes stale
-        this.watchedInodes.set(watchPath, BigInt(stats.ino));
-
-        // Watch the directory with recursive option (Node.js 20+ supports this on all platforms)
-        const watcher = fs.watch(
-          watchPath,
-          { recursive: true, persistent: true },
-          (eventType, filename) => {
-            if (filename) {
-              this.handleFsEvent(watchPath, filename, eventType);
-            }
-          }
-        );
-
-        watcher.on('error', (error: NodeJS.ErrnoException) => {
-          console.error(`[smartwatch] FSWatcher error event on ${watchPath}:`, error);
-
-          // Detect inotify watch limit exceeded - common cause of "stops working"
-          if (error.code === 'ENOSPC') {
-            console.error('[smartwatch] CRITICAL: inotify watch limit exceeded!');
-            console.error('[smartwatch] Fix with: echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p');
-          }
-
-          this.safeEmit({ type: 'error', path: watchPath, error });
-          if (this._isWatching) {
-            this.restartWatcher(watchPath, error);
-          }
-        });
-
-        // Handle 'close' event - fs.watch can close without error
-        watcher.on('close', () => {
-          console.warn(`[smartwatch] FSWatcher closed unexpectedly for ${watchPath}`);
-          if (this._isWatching) {
-            this.restartWatcher(watchPath, new Error('Watcher closed unexpectedly'));
-          }
-        });
-
-        this.watchers.set(watchPath, watcher);
-        console.log(`[smartwatch] Started watching: ${watchPath}`);
-      }
-    } catch (error: any) {
-      console.error(`[smartwatch] Failed to watch path ${watchPath}:`, error);
-      this.safeEmit({ type: 'error', path: watchPath, error });
+      this.events$.next(event);
+    } catch (error) {
+      console.error('[smartwatch] Subscriber threw error (isolated):', error);
    }
  }
-
-  /**
-   * Handle raw fs.watch events - debounce and normalize them
-   */
-  private handleFsEvent(
-    basePath: string,
-    filename: string,
-    eventType: 'rename' | 'change' | string
-  ): void {
-    const fullPath = path.join(basePath, filename);
-
-    // Skip temporary files - but ONLY pure temp files, not the target of atomic writes
-    // Atomic writes: editor writes to file.tmp.xxx then renames to file
-    // We need to detect the final file, so only skip files that ARE temp files
-    // and haven't been renamed to the real file yet
-    if (this.isTemporaryFile(fullPath)) {
-      // For temp files, we still want to track if they get renamed TO a real file
-      // The 'rename' event fires for both source and target, so we'll catch the real file
-      console.log(`[smartwatch] Skipping temp file event: ${filename}`);
-      return;
-    }
-
-    // Debounce: cancel any pending emit for this file
-    const existing = this.pendingEmits.get(fullPath);
-    if (existing) {
-      clearTimeout(existing);
-    }
-
-    // Schedule debounced emit
-    const timeout = setTimeout(() => {
-      this.pendingEmits.delete(fullPath);
-      this.emitFileEvent(fullPath, eventType);
-    }, this.options.debounceMs);
-
-    this.pendingEmits.set(fullPath, timeout);
-  }
-
-  /**
-   * Emit the actual file event after debounce
-   */
-  private async emitFileEvent(
-    fullPath: string,
-    eventType: 'rename' | 'change' | string
-  ): Promise<void> {
-    try {
-      const stats = await this.statSafe(fullPath);
-
-      if (eventType === 'rename') {
-        // 'rename' can mean add or unlink - check if file exists
-        if (stats) {
-          // File exists - it's either a new file or was renamed to this location
-          if (stats.isDirectory()) {
-            if (!this.watchedFiles.has(fullPath)) {
-              this.watchedFiles.add(fullPath);
-              this.safeEmit({ type: 'addDir', path: fullPath, stats });
-            }
-          } else {
-            const wasWatched = this.watchedFiles.has(fullPath);
-            this.watchedFiles.add(fullPath);
-            this.safeEmit({
-              type: wasWatched ? 'change' : 'add',
-              path: fullPath,
-              stats
-            });
-          }
-        } else {
-          // File doesn't exist - it was deleted
-          if (this.watchedFiles.has(fullPath)) {
-            const wasDir = this.isKnownDirectory(fullPath);
-            this.watchedFiles.delete(fullPath);
-            this.safeEmit({
-              type: wasDir ? 'unlinkDir' : 'unlink',
-              path: fullPath
-            });
-          }
-        }
-      } else if (eventType === 'change') {
-        // File was modified
-        if (stats && !stats.isDirectory()) {
-          const wasWatched = this.watchedFiles.has(fullPath);
-          if (!wasWatched) {
-            // This is actually an 'add' - file wasn't being watched before
-            this.watchedFiles.add(fullPath);
-            this.safeEmit({ type: 'add', path: fullPath, stats });
-          } else {
-            this.safeEmit({ type: 'change', path: fullPath, stats });
-          }
-        } else if (!stats && this.watchedFiles.has(fullPath)) {
-          // File was deleted
-          this.watchedFiles.delete(fullPath);
-          this.safeEmit({ type: 'unlink', path: fullPath });
-        }
-      }
-    } catch (error: any) {
-      this.safeEmit({ type: 'error', path: fullPath, error });
-    }
-  }
-
-  /**
-   * Scan directory and emit 'add' events for existing files
-   */
-  private async scanDirectory(dirPath: string, depth: number): Promise<void> {
-    if (depth > this.options.depth) {
-      return;
-    }
-
-    try {
-      const entries = await fs.promises.readdir(dirPath, { withFileTypes: true });
-
-      for (const entry of entries) {
-        const fullPath = path.join(dirPath, entry.name);
-
-        // Skip temp files during initial scan too
-        if (this.isTemporaryFile(fullPath)) {
-          continue;
-        }
-
-        const stats = await this.statSafe(fullPath);
-
-        if (!stats) {
-          continue;
-        }
-
-        if (entry.isDirectory()) {
-          this.watchedFiles.add(fullPath);
-          this.safeEmit({ type: 'addDir', path: fullPath, stats });
-          await this.scanDirectory(fullPath, depth + 1);
-        } else if (entry.isFile()) {
-          this.watchedFiles.add(fullPath);
-          this.safeEmit({ type: 'add', path: fullPath, stats });
-        }
-      }
-    } catch (error: any) {
-      if (error.code !== 'ENOENT' && error.code !== 'EACCES') {
-        this.safeEmit({ type: 'error', path: dirPath, error });
-      }
-    }
-  }
-
-  /**
-   * Safely stat a path, returning null if it doesn't exist
-   */
-  private async statSafe(filePath: string): Promise<fs.Stats | null> {
-    try {
-      return await (this.options.followSymlinks
-        ? fs.promises.stat(filePath)
-        : fs.promises.lstat(filePath));
-    } catch (error: any) {
-      // Only silently return null for expected "file doesn't exist" errors
-      if (error.code === 'ENOENT' || error.code === 'ENOTDIR') {
-        return null;
-      }
-      // Log other errors (permission, I/O) but still return null
-      console.warn(`[smartwatch] statSafe warning for ${filePath}: ${error.code} - ${error.message}`);
-      return null;
-    }
-  }
-
-  /**
-   * Check if a path was known to be a directory (for proper unlink event type)
-   */
-  private isKnownDirectory(filePath: string): boolean {
-    // Check if any watched files are children of this path
-    for (const watched of this.watchedFiles) {
-      if (watched.startsWith(filePath + path.sep)) {
-        return true;
-      }
-    }
-    return false;
-  }
 }
--- a/ts/watchers/watcher.rust.ts
+++ b/ts/watchers/watcher.rust.ts
@@ -0,0 +1,154 @@
+import * as path from 'node:path';
+import * as smartrx from '@push.rocks/smartrx';
+import * as smartrust from '@push.rocks/smartrust';
+import type { IWatcher, IWatcherOptions, IWatchEvent, TWatchEventType } from './interfaces.js';
+
+// Resolve the package directory for binary location
+const packageDir = path.resolve(new URL('.', import.meta.url).pathname, '..', '..');
+
+/**
+ * Command map for the Rust file watcher binary
+ */
+type TWatcherCommands = {
+  watch: {
+    params: {
+      paths: string[];
+      depth: number;
+      followSymlinks: boolean;
+      debounceMs: number;
+    };
+    result: { watching: boolean };
+  };
+  stop: {
+    params: Record<string, never>;
+    result: { stopped: boolean };
+  };
+};
+
+/**
+ * Build local search paths for the Rust binary
+ */
+function buildLocalPaths(): string[] {
+  const platform = process.platform === 'darwin' ? 'macos' : process.platform;
+  const arch = process.arch === 'x64' ? 'amd64' : process.arch === 'arm64' ? 'arm64' : process.arch;
+  const platformSuffix = `${platform}_${arch}`;
+
+  return [
+    path.join(packageDir, 'dist_rust', `smartwatch-rust_${platformSuffix}`),
+    path.join(packageDir, 'dist_rust', 'smartwatch-rust'),
+    path.join(packageDir, 'rust', 'target', 'release', 'smartwatch-rust'),
+    path.join(packageDir, 'rust', 'target', 'debug', 'smartwatch-rust'),
+  ];
+}
+
+/**
+ * Rust-based file watcher using the notify crate via @push.rocks/smartrust
+ *
+ * Uses a Rust binary for native OS-level file watching (inotify/FSEvents/ReadDirectoryChangesW).
+ * Works across Node.js, Deno, and Bun via smartrust's IPC bridge.
+ */
+export class RustWatcher implements IWatcher {
+  private bridge: smartrust.RustBridge<TWatcherCommands>;
+  private _isWatching = false;
+
+  public readonly events$ = new smartrx.rxjs.Subject<IWatchEvent>();
+
+  constructor(private options: IWatcherOptions) {
+    this.bridge = new smartrust.RustBridge<TWatcherCommands>({
+      binaryName: 'smartwatch-rust',
+      localPaths: buildLocalPaths(),
+      searchSystemPath: false,
+      cliArgs: ['--management'],
+      requestTimeoutMs: 30000,
+      readyTimeoutMs: 10000,
+    });
+  }
+
+  get isWatching(): boolean {
+    return this._isWatching;
+  }
+
+  /**
+   * Check if the Rust binary is available on this system
+   */
+  static async isAvailable(): Promise<boolean> {
+    try {
+      const locator = new smartrust.RustBinaryLocator({
+        binaryName: 'smartwatch-rust',
+        localPaths: buildLocalPaths(),
+        searchSystemPath: false,
+      });
+      const binaryPath = await locator.findBinary();
+      return binaryPath !== null;
+    } catch {
+      return false;
+    }
+  }
+
+  async start(): Promise<void> {
+    if (this._isWatching) return;
+
+    console.log(`[smartwatch] Starting Rust watcher for ${this.options.basePaths.length} base path(s)...`);
+
+    // Listen for file system events from the Rust binary
+    this.bridge.on('management:fsEvent', (data: { type: string; path: string }) => {
+      const eventType = data.type as TWatchEventType;
+      this.safeEmit({ type: eventType, path: data.path });
+    });
+
+    this.bridge.on('management:error', (data: { message: string }) => {
+      console.error('[smartwatch] Rust watcher error:', data.message);
+      this.safeEmit({ type: 'error', path: '', error: new Error(data.message) });
+    });
+
+    this.bridge.on('management:watchReady', () => {
+      console.log('[smartwatch] Rust watcher ready - initial scan complete');
+      this.safeEmit({ type: 'ready', path: '' });
+    });
+
+    // Spawn the Rust binary
+    const ok = await this.bridge.spawn();
+    if (!ok) {
+      throw new Error('[smartwatch] Failed to spawn Rust watcher binary');
+    }
+
+    // Resolve paths to absolute
+    const absolutePaths = this.options.basePaths.map(p => path.resolve(p));
+
+    // Send watch command
+    await this.bridge.sendCommand('watch', {
+      paths: absolutePaths,
+      depth: this.options.depth,
+      followSymlinks: this.options.followSymlinks,
+      debounceMs: this.options.debounceMs,
+    });
+
+    this._isWatching = true;
+    console.log('[smartwatch] Rust watcher started');
+  }
+
+  async stop(): Promise<void> {
+    console.log('[smartwatch] Stopping Rust watcher...');
+
+    if (this._isWatching) {
+      try {
+        await this.bridge.sendCommand('stop', {} as any);
+      } catch {
+        // Binary may already be gone
+      }
+    }
+
+    this.bridge.kill();
+    this._isWatching = false;
+    console.log('[smartwatch] Rust watcher stopped');
+  }
+
+  /** Safely emit an event, isolating subscriber errors */
+  private safeEmit(event: IWatchEvent): void {
+    try {
+      this.events$.next(event);
+    } catch (error) {
+      console.error('[smartwatch] Subscriber threw error (isolated):', error);
+    }
+  }
+}
Author	SHA1	Message	Date
Juergen Kunz	adb2e5a1db	v6.4.0 Some checks failed Default (tags) / security (push) Failing after 0s Details Default (tags) / test (push) Failing after 0s Details Default (tags) / release (push) Has been skipped Details Default (tags) / metadata (push) Has been skipped Details	2026-03-23 14:15:31 +00:00
Juergen Kunz	7def7020c6	feat(watchers): add Rust-powered watcher backend with runtime fallback and cross-platform test coverage	2026-03-23 14:15:31 +00:00
Juergen Kunz	ca9a66e03e	v6.3.1 Some checks failed Default (tags) / security (push) Failing after 0s Details Default (tags) / test (push) Failing after 0s Details Default (tags) / release (push) Has been skipped Details Default (tags) / metadata (push) Has been skipped Details	2026-03-23 11:28:50 +00:00
Juergen Kunz	48081302c8	fix(watcher): unref lingering FSWatcher handles after stopping the node watcher	2026-03-23 11:28:50 +00:00
Juergen Kunz	09485e20d9	v6.3.0 Some checks failed Default (tags) / security (push) Failing after 17s Details Default (tags) / test (push) Failing after 18s Details Default (tags) / release (push) Has been skipped Details Default (tags) / metadata (push) Has been skipped Details	2025-12-11 21:04:42 +00:00
Juergen Kunz	61a8222c9b	feat(watchers): Integrate chokidar-based Node watcher, expose awaitWriteFinish options, and update docs/tests	2025-12-11 21:04:42 +00:00
Juergen Kunz	696d454b00	v6.2.5 Some checks failed Default (tags) / security (push) Failing after 16s Details Default (tags) / test (push) Failing after 18s Details Default (tags) / release (push) Has been skipped Details Default (tags) / metadata (push) Has been skipped Details	2025-12-11 19:13:35 +00:00
Juergen Kunz	da77d8a608	fix(watcher.node): Normalize paths and improve Node watcher robustness: restart/rescan on errors (including ENOSPC), clear stale state, and remove legacy throttler	2025-12-11 19:13:35 +00:00
Juergen Kunz	0bab7e0296	v6.2.4 Some checks failed Default (tags) / security (push) Failing after 15s Details Default (tags) / test (push) Failing after 17s Details Default (tags) / release (push) Has been skipped Details Default (tags) / metadata (push) Has been skipped Details	2025-12-11 11:35:45 +00:00
Juergen Kunz	f4243f190b	fix(tests): Stabilize tests and document chokidar-inspired Node watcher architecture	2025-12-11 11:35:45 +00:00
Juergen Kunz	afe462990f	v6.2.3 Some checks failed Default (tags) / security (push) Failing after 15s Details Default (tags) / test (push) Failing after 17s Details Default (tags) / release (push) Has been skipped Details Default (tags) / metadata (push) Has been skipped Details	2025-12-11 09:07:57 +00:00
Juergen Kunz	90275a0f1c	fix(watcher.node): Improve handling of temporary files from atomic editor writes in Node watcher	2025-12-11 09:07:57 +00:00
Juergen Kunz	ef2388b16f	v6.2.2 Some checks failed Default (tags) / security (push) Failing after 16s Details Default (tags) / test (push) Failing after 18s Details Default (tags) / release (push) Has been skipped Details Default (tags) / metadata (push) Has been skipped Details	2025-12-11 02:39:38 +00:00
Juergen Kunz	6f6868f2ad	fix(watcher.node): Defer events during initial scan, track full event sequences, and harden watcher shutdown	2025-12-11 02:39:38 +00:00
Juergen Kunz	ea57de06dd	v6.2.1 Some checks failed Default (tags) / security (push) Failing after 16s Details Default (tags) / test (push) Failing after 17s Details Default (tags) / release (push) Has been skipped Details Default (tags) / metadata (push) Has been skipped Details	2025-12-10 16:52:06 +00:00
Juergen Kunz	4894253e48	fix(watcher.node): Handle fs.watch close without spurious restarts; add tests and improve test runner	2025-12-10 16:52:06 +00:00
Juergen Kunz	2f55f628f5	v6.2.0 Some checks failed Default (tags) / security (push) Failing after 16s Details Default (tags) / test (push) Failing after 17s Details Default (tags) / release (push) Has been skipped Details Default (tags) / metadata (push) Has been skipped Details	2025-12-10 14:18:40 +00:00
Juergen Kunz	5dda689b4c	feat(watchers): Improve Node watcher robustness: file-level inode tracking, abortable restarts, restart race guards, and untracked-file handling	2025-12-10 14:18:40 +00:00