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Default to using Bun instead of Node.js for all JavaScript/TypeScript operations including running files, testing, building, and package management.
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| name | bun |
| description | Default to using Bun instead of Node.js for all JavaScript/TypeScript operations including running files, testing, building, and package management. |
Default to using Bun instead of Node.js for all JavaScript/TypeScript operations.
bun <file> instead of node <file> or ts-node <file>bun test instead of jest or vitestbun build <file.html|file.ts|file.css> instead of webpack or esbuildbun install instead of npm install or yarn install or pnpm installbun run <script> instead of npm run <script> or yarn run <script> or pnpm run <script>Prefer Bun's built-in APIs over external packages:
Bun.serve() supports WebSockets, HTTPS, and routes. Don't use express.bun:sqlite for SQLite. Don't use better-sqlite3.Bun.redis for Redis. Don't use ioredis.Bun.sql for Postgres. Don't use pg or postgres.js.WebSocket is built-in. Don't use ws.Bun.file over node:fs's readFile/writeFileBun.$ instead of execa.Use bun test to run tests.
import { test, expect } from "bun:test";
test("hello world", () => {
expect(1).toBe(1);
});
Use HTML imports with Bun.serve(). Don't use vite. HTML imports fully support React, CSS, Tailwind.
import index from "./index.html"
Bun.serve({
routes: {
"/": index,
"/api/users/:id": {
GET: (req) => {
return new Response(JSON.stringify({ id: req.params.id }));
},
},
},
// optional websocket support
websocket: {
open: (ws) => {
ws.send("Hello, world!");
},
message: (ws, message) => {
ws.send(message);
},
close: (ws) => {
// handle close
}
},
development: {
hmr: true,
console: true,
}
})
HTML files can import .tsx, .jsx or .js files directly and Bun's bundler will transpile & bundle automatically. <link> tags can point to stylesheets and Bun's CSS bundler will bundle.
<html>
<body>
<h1>Hello, world!</h1>
<script type="module" src="./frontend.tsx"></script>
</body>
</html>
import React from "react";
// import .css files directly and it works
import './index.css';
import { createRoot } from "react-dom/client";
const root = createRoot(document.body);
export default function Frontend() {
return <h1>Hello, world!</h1>;
}
root.render(<Frontend />);
bun --hot ./index.ts
For more information, read the Bun API docs in node_modules/bun-types/docs/**.md.