feat: run on Node and Bun, and fix the broken pipeline

.github/workflows/ci.yml

@@ -8,20 +8,75 @@ on:
 
 jobs:
   test:
-    name: Check and Test
+    name: Check and Test (deno ${{ matrix.deno-version }})
     runs-on: ubuntu-latest
 
+    strategy:
+      fail-fast: false
+      matrix:
+        # Pinned baseline plus the moving latest release, so a type or lint
+        # change in a newer Deno fails here instead of in the Publish job.
+        deno-version: [v2.5.4, v2.x]
+
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
 
       - name: Setup Deno
         uses: denoland/setup-deno@v2
         with:
-          deno-version: v2.5.4
+          deno-version: ${{ matrix.deno-version }}
 
       - name: Run source checks
         run: deno task check
 
       - name: Run test suite
         run: deno task test
+
+  smoke-node:
+    name: Smoke (node ${{ matrix.node-version }})
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        # 24 is the current LTS; 22 is the floor the package claims to support.
+        node-version: ['22', '24']
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v7
+
+      - name: Setup Deno
+        uses: denoland/setup-deno@v2
+        with:
+          deno-version: v2.x
+
+      - name: Setup Node
+        uses: actions/setup-node@v7
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Send a message on Node
+        run: deno task smoke:node
+
+  smoke-bun:
+    name: Smoke (bun)
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v7
+
+      - name: Setup Deno
+        uses: denoland/setup-deno@v2
+        with:
+          deno-version: v2.x
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - name: Send a message on Bun
+        run: deno task smoke:bun

.github/workflows/publish.yml

@@ -13,13 +13,13 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: denoland/setup-deno@v2
         with:
           deno-version: v2.5.4
 
-      - name: Run lint and check
-        run: deno lint src/ && deno check src/
+      - name: Run source checks
+        run: deno task check
 
       - name: Publish package
         run: deno publish

CHANGELOG.md

@@ -5,25 +5,40 @@ All notable changes to this project are documented in this file.
 The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.4.0] - 2026-10-12
 
 ### Added
 
+- Added Node and Bun support: the package now runs on Deno, Node `>=22` and Bun `>=1.1`. Node and Bun install it from JSR with `npx jsr add @neabyte/deno-mailer`, which serves the same source as ESM with type declarations
+- Added `SmtpTransport` runtime abstraction with a native Deno implementation and a `node:net`/`node:tls` implementation selected at connect time
+- Added `deno task bundle`, `deno task smoke:node` and `deno task smoke:bun`, which send a message through a bundled build against a loopback SMTP server on each runtime
 - Added `connectionTimeoutMs` SMTP config option (default `30000`) bounding TCP connect and each TLS handshake
 - Added `socketTimeoutMs` SMTP config option (default `60000`) bounding each server reply wait and socket write
 - Added config validation for timeout options (integer between `1` and `2147483647`)
 - Added loopback SMTP server test helper and transport timeout regression tests
 
 ### Changed
 
+- **Breaking:** `SmtpConnectionState` now carries a single `transport: SmtpTransport | null` field instead of `conn: Deno.Conn | null` and `tlsConn: Deno.TlsConn | null`, removing `Deno.*` from the published type surface
+- Updated the TLS upgrade to resolve only after the handshake completes, so one timeout covers the whole upgrade on every runtime
 - Updated SMTP client to close its socket on timeout so pooled clients reconnect instead of reusing a dead connection
 - Updated RCPT handling to fail the send on timeout instead of counting the recipient as rejected
 - Updated implicit TLS (`secure: true`) to connect over TCP then start TLS, so connect and handshake are bounded separately
 - Updated `SmtpAuth` to share `SmtpCommand` wire I/O instead of a duplicate reader and writer
+- Updated CI to run the check and test tasks against both the pinned Deno release and the latest `v2.x`
+- Updated `deno task check` to verify formatting instead of rewriting it; use `deno task fmt` to format
+
+### Removed
+
+- **Breaking:** Removed the exported `SmtpConnection` class. It was unreachable from `SmtpClient` and reimplemented the transport without read, write or connect timeouts, without partial-write handling, and without multi-line reply parsing
 
 ### Fixed
 
+- Fixed `deno check` failing on Deno `>=2.6`, where the pooled idle timer handle is an object rather than a number
 - Fixed SMTP writes ignoring partial socket writes, which truncated messages larger than one write (64 KiB over TLS) and left `send()` waiting indefinitely
+- Fixed the Node and Bun TLS upgrade rejecting data buffered before the handshake, which would otherwise allow STARTTLS command injection
+- Fixed the secured socket leaking when a TLS handshake exceeded `connectionTimeoutMs`; the abandoned handshake is now aborted and its socket closed
+- Fixed TLS upgrades to an SMTP host given as an IP address, which `node:tls` rejects when the address is offered as an SNI name
 
 ## [0.3.0] - 2026-03-25
 

README.md

@@ -2,9 +2,9 @@
 
 # Deno Mailer
 
-Lightweight Deno SMTP mailer with flexible configuration and formatting.
+Lightweight SMTP mailer for Deno, Node and Bun, with flexible configuration and formatting.
 
-[![Deno](https://img.shields.io/badge/deno-%3E%3D2.x-000000?logo=deno&logoColor=white)](https://deno.com) [![JSR](https://jsr.io/badges/@neabyte/deno-mailer)](https://jsr.io/@neabyte/deno-mailer) [![CI](https://github.com/NeaByteLab/Deno-Mailer/actions/workflows/ci.yml/badge.svg)](https://github.com/NeaByteLab/Deno-Mailer/actions/workflows/ci.yml) [![License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
+[![Deno](https://img.shields.io/badge/deno-%3E%3D2.x-000000?logo=deno&logoColor=white)](https://deno.com) [![Node](https://img.shields.io/badge/node-%3E%3D22-5FA04E?logo=nodedotjs&logoColor=white)](https://nodejs.org) [![Bun](https://img.shields.io/badge/bun-%3E%3D1.1-FBF0DF?logo=bun&logoColor=black)](https://bun.sh) [![JSR](https://jsr.io/badges/@neabyte/deno-mailer)](https://jsr.io/@neabyte/deno-mailer) [![CI](https://github.com/NeaByteLab/Deno-Mailer/actions/workflows/ci.yml/badge.svg)](https://github.com/NeaByteLab/Deno-Mailer/actions/workflows/ci.yml) [![License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 
 </div>
 
@@ -20,15 +20,30 @@ Lightweight Deno SMTP mailer with flexible configuration and formatting.
 - **Transfer encodings**: base64, 7bit, quoted-printable for attachment content
 - **Calendar invitations**: generates ICS calendar payload for meeting invites
 - **Structured send result**: returns message id, envelope, accepted, rejected, and response
-- **Zero external runtime deps**: built with Deno native capabilities
+- **Runs on Deno, Node and Bun**: one source, native `Deno.connect` on Deno and `node:net`/`node:tls` elsewhere
+- **Zero external runtime deps**: built on runtime primitives only
 
 ## Installation
 
 ```bash
-# Install package from JSR.
+# Deno, from JSR.
 deno add jsr:@neabyte/deno-mailer
 ```
 
+```bash
+# Node.
+npx jsr add @neabyte/deno-mailer
+```
+
+```bash
+# Bun.
+bunx jsr add @neabyte/deno-mailer
+```
+
+Requires Deno `>=2.x`, Node `>=22` or Bun `>=1.1`. On Node and Bun, `jsr add` registers the
+`@jsr` registry in your project and installs the same source as ESM with type declarations,
+so the import specifier stays `@neabyte/deno-mailer`.
+
 ## Quick Start
 
 ```ts
@@ -65,6 +80,12 @@ console.log(result.messageId)
 deno task check
 ```
 
+```bash
+# Bundle the library and send a message through it on Node and on Bun.
+deno task smoke:node
+deno task smoke:bun
+```
+
 ## Test
 
 ```bash

USAGE.md

@@ -41,21 +41,35 @@ This document explains the full **Deno Mailer** usage flow, from SMTP configurat
 ## Installation
 
 ```bash
-# Install package from JSR.
+# Deno.
 deno add jsr:@neabyte/deno-mailer
 ```
 
-Import the mailer from the same specifier your project uses for JSR (after `deno add`, the import map entry is usually `@neabyte/deno-mailer`):
+```bash
+# Node.
+npx jsr add @neabyte/deno-mailer
+```
+
+```bash
+# Bun.
+bunx jsr add @neabyte/deno-mailer
+```
+
+Requires Deno `>=2.x`, Node `>=22` or Bun `>=1.1`. On Node and Bun, `jsr add` registers the
+`@jsr` registry in your project and installs the library as ESM with type declarations, so the
+import specifier is the same on every runtime.
 
 ```ts
-import { mailer } from 'jsr:@neabyte/deno-mailer'
-// or: import { mailer } from '@neabyte/deno-mailer'
+import { mailer } from '@neabyte/deno-mailer'
+// Deno also accepts the fully qualified form:
+// import { mailer } from 'jsr:@neabyte/deno-mailer'
 ```
 
-Types ship with the package. Use `import type { EmailMessage, SmtpConnectionConfig, SmtpSendResult } from 'jsr:@neabyte/deno-mailer'` when you only need types.
+Types ship with the package. Use `import type { EmailMessage, SmtpConnectionConfig, SmtpSendResult } from '@neabyte/deno-mailer'` when you only need types.
 
 > [!TIP]
-> After `deno add`, prefer the import map key (often `@neabyte/deno-mailer`) so paths stay short and consistent.
+> The library opens sockets with `Deno.connect` on Deno and with `node:net` on Node and Bun. On
+> Deno this needs `--allow-net`; no permission flags apply on Node or Bun.
 
 ## Configuration
 
@@ -119,7 +133,8 @@ const transporter = mailer.transporter({
   dkim: {
     domainName: 'example.com',
     keySelector: 'mail',
-    privateKey: Deno.env.get('DKIM_PRIVATE_KEY') || ''
+    // Deno: Deno.env.get('DKIM_PRIVATE_KEY'); Node and Bun: process.env.DKIM_PRIVATE_KEY
+    privateKey: readDkimPrivateKey()
   }
 })
 ```

deno.json

@@ -1,7 +1,7 @@
 {
   "name": "@neabyte/deno-mailer",
-  "description": "Lightweight Deno SMTP mailer with flexible configuration and formatting",
-  "version": "0.3.0",
+  "description": "Lightweight SMTP mailer for Deno, Node and Bun with flexible configuration and formatting",
+  "version": "0.4.0",
   "type": "module",
   "license": "MIT",
   "exports": "./src/index.ts",
@@ -61,13 +61,18 @@
     "exclude": ["tests/**/*.d.ts"]
   },
   "tasks": {
-    "check": "deno fmt src/ && deno lint src/ && deno check src/",
-    "test": "deno test --allow-net --allow-env tests/"
+    "fmt": "deno fmt src/ tests/ scripts/",
+    "check": "deno fmt --check src/ tests/ scripts/ && deno lint src/ && deno check src/ tests/",
+    "test": "deno test --allow-net --allow-env tests/",
+    "bundle": "deno bundle --platform=deno --packages=external --format=esm src/index.ts -o dist/mailer.mjs",
+    "smoke:node": "deno task bundle && node scripts/smoke.mjs",
+    "smoke:bun": "deno task bundle && bun scripts/smoke.mjs"
   },
   "imports": {
     "@std/assert": "jsr:@std/assert@^1.0.19",
     "@app/": "./src/",
     "@smtp/": "./src/smtp/",
+    "@runtime/": "./src/runtime/",
     "@utils/": "./src/utils/",
     "@tests/": "./tests/"
   },