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| 1 | +Default to using Bun instead of Node.js. |
| 2 | + |
| 3 | +- Use `bun <file>` instead of `node <file>` or `ts-node <file>` |
| 4 | +- Use `bun test` instead of `jest` or `vitest` |
| 5 | +- Use `bun build <file.html|file.ts|file.css>` instead of `webpack` or `esbuild` |
| 6 | +- Use `bun install` instead of `npm install` or `yarn install` or `pnpm install` |
| 7 | +- Use `bun run <script>` instead of `npm run <script>` or `yarn run <script>` or `pnpm run <script>` |
| 8 | +- Bun automatically loads .env, so don't use dotenv. |
| 9 | + |
| 10 | +## APIs |
| 11 | + |
| 12 | +- `Bun.serve()` supports WebSockets, HTTPS, and routes. Don't use `express`. |
| 13 | +- `bun:sqlite` for SQLite. Don't use `better-sqlite3`. |
| 14 | +- `Bun.redis` for Redis. Don't use `ioredis`. |
| 15 | +- `Bun.sql` for Postgres. Don't use `pg` or `postgres.js`. |
| 16 | +- `WebSocket` is built-in. Don't use `ws`. |
| 17 | +- Prefer `Bun.file` over `node:fs`'s readFile/writeFile |
| 18 | +- Bun.$`ls` instead of execa. |
| 19 | + |
| 20 | +## Testing |
| 21 | + |
| 22 | +Use `bun test` to run tests. |
| 23 | + |
| 24 | +```ts#index.test.ts |
| 25 | +import { test, expect } from "bun:test"; |
| 26 | + |
| 27 | +test("hello world", () => { |
| 28 | + expect(1).toBe(1); |
| 29 | +}); |
| 30 | +``` |
| 31 | + |
| 32 | +## Frontend |
| 33 | + |
| 34 | +Use HTML imports with `Bun.serve()`. Don't use `vite`. HTML imports fully support React, CSS, Tailwind. |
| 35 | + |
| 36 | +Server: |
| 37 | + |
| 38 | +```ts#index.ts |
| 39 | +import index from "./index.html" |
| 40 | + |
| 41 | +Bun.serve({ |
| 42 | + routes: { |
| 43 | + "/": index, |
| 44 | + "/api/users/:id": { |
| 45 | + GET: (req) => { |
| 46 | + return new Response(JSON.stringify({ id: req.params.id })); |
| 47 | + }, |
| 48 | + }, |
| 49 | + }, |
| 50 | + // optional websocket support |
| 51 | + websocket: { |
| 52 | + open: (ws) => { |
| 53 | + ws.send("Hello, world!"); |
| 54 | + }, |
| 55 | + message: (ws, message) => { |
| 56 | + ws.send(message); |
| 57 | + }, |
| 58 | + close: (ws) => { |
| 59 | + // handle close |
| 60 | + } |
| 61 | + }, |
| 62 | + development: { |
| 63 | + hmr: true, |
| 64 | + console: true, |
| 65 | + } |
| 66 | +}) |
| 67 | +``` |
| 68 | + |
| 69 | +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. |
| 70 | + |
| 71 | +```html#index.html |
| 72 | +<html> |
| 73 | + <body> |
| 74 | + <h1>Hello, world!</h1> |
| 75 | + <script type="module" src="./frontend.tsx"></script> |
| 76 | + </body> |
| 77 | +</html> |
| 78 | +``` |
| 79 | + |
| 80 | +With the following `frontend.tsx`: |
| 81 | + |
| 82 | +```tsx#frontend.tsx |
| 83 | +import React from "react"; |
| 84 | + |
| 85 | +// import .css files directly and it works |
| 86 | +import './index.css'; |
| 87 | + |
| 88 | +import { createRoot } from "react-dom/client"; |
| 89 | + |
| 90 | +const root = createRoot(document.body); |
| 91 | + |
| 92 | +export default function Frontend() { |
| 93 | + return <h1>Hello, world!</h1>; |
| 94 | +} |
| 95 | + |
| 96 | +root.render(<Frontend />); |
| 97 | +``` |
| 98 | + |
| 99 | +Then, run index.ts |
| 100 | + |
| 101 | +```sh |
| 102 | +bun --hot ./index.ts |
| 103 | +``` |
| 104 | + |
| 105 | +For more information, read the Bun API docs in `node_modules/bun-types/docs/**.md`. |
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