bun

| Instead of | Use |

|------------|-----|

| node file.ts | bun file.ts |

| ts-node file.ts | bun file.ts |

| npm install | bun install |

| npm run script | bun run script |

| jest / vitest | bun test |

| webpack / esbuild | bun build |

Bun automatically loads .env files - don't use dotenv.

Prefer these over Node.js equivalents:

| API | Purpose | Don't use |

|-----|---------|-----------|

| Bun.serve() | HTTP server with WebSocket, HTTPS, routes | express |

| bun:sqlite | SQLite database | better-sqlite3 |

| Bun.redis | Redis client | ioredis |

| Bun.sql | Postgres client | pg, postgres.js |

| Bun.file() | File operations | node:fs readFile/writeFile |

| Bun.$\cmd\`` | Shell commands | execa |

| WebSocket | WebSocket client (built-in) | ws |

Use bun:test for tests:

```ts

import { test, expect } from "bun:test";

test("description", () => {

expect(1).toBe(1);

});

```

Run with bun test.

Use HTML imports with Bun.serve() instead of Vite. Supports React, CSS, Tailwind.

Server:

```ts

import index from "./index.html"

Bun.serve({

routes: {

"/": index,

"/api/users/:id": {

GET: (req) => Response.json({ id: req.params.id }),

},

},

development: { hmr: true, console: true }

})

```

HTML file:

```html

```

Bun's bundler transpiles .tsx, .jsx, .js automatically. CSS is bundled via tags.

Run with bun --hot ./server.ts for HMR.

For detailed API docs, see node_modules/bun-types/docs/**.md.