bun

Use Bun instead of Node.js, npm, pnpm, or vite.

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Install / Use

npx skills add Rettend/bun-test-ui

Installs into whichever agent you are using.

About this skill

📐

Cursor Rules

Cursor IDE rules (v2)

Quality Score

60/100

Our assessment of bun

bun scores 60/100 on our quality scale, 4058th of 4,599 Development & Engineering skills we index.

Its Cursor Rules is 2.6 KB long, split into 4 sections with 5 code examples: a solid amount of guidance for an agent.

It has no GitHub stars yet, so there is no community track record; judge it on its content.

Substance

26/30

Structure

15/20

Description

8/15

Adoption

0/20

Freshness

11/15

Maintenance, license and trust

The repository was last updated about 8 months ago. That is recent enough to be usable, but agent tooling moves fast, so check the instructions against your agent's current version.
No license is declared. By default that means all rights are reserved: you can read it, but reusing or redistributing it is not clearly permitted. Ask the author before building on it commercially.
Its trust signals score 74/100, with 3 cautions from licensing, adoption, age or documentation. These come from repository metadata, not a code audit — read the skill file before letting an agent act on it.

bun compared with similar skills

All 4 of these similar skills score higher than bun; compare them before choosing.

Skill	Score	Stars	Updated	Format
bun (this skill)by Rettend	60	0	8mo ago	Cursor Rules
taste-skillby Leonxlnx	100	99.8k	today	CLAUDE.md
ai-job-searchby MadsLorentzen	100	60.2k	today	CLAUDE.md
claude-howtoby luongnv89	100	42.1k	today	CLAUDE.md
algorithmic-artby anthropics	100	177.9k	28d ago	SKILL.md

Frequently asked questions

How do I install bun?: Run npx skills add Rettend/bun-test-ui. The install tabs above show the steps for each supported agent.
Which AI agents does bun work with?: It is written for Cursor, as a Cursor Rules file. Other agents that read the same format can often use it too.
Is bun safe to use?: It declares no license and scores 74/100 on trust signals. Skills are instructions an agent will follow, so read the file before installing it and do not approve commands you do not understand.
Is bun still maintained?: The repository was last updated about 8 months ago. That is recent enough to be usable, but agent tooling moves fast, so check the instructions against your agent's current version.

Skill content

View source on GitHub

description: Use Bun instead of Node.js, npm, pnpm, or vite. globs: ".ts, .tsx, .html, .css, .js, .jsx, package.json" alwaysApply: false

Default to using Bun instead of Node.js

Use bun <file> instead of node <file> or ts-node <file>
Use bun test instead of jest or vitest
Use bun build <file.html|file.ts|file.css> instead of webpack or esbuild
Use bun install instead of npm install or yarn install or pnpm install
Use bun run <script> instead of npm run <script> or yarn run <script> or pnpm run <script>
Use bunx <package> <command> instead of npx <package> <command>
Bun automatically loads .env, so don't use dotenv.

APIs

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.
Prefer Bun.file over node:fs's readFile/writeFile
Bun.$ls instead of execa.

Testing

Use bun test to run tests.

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

test("hello world", () => {
  expect(1).toBe(1);
});

Frontend

Use HTML imports with Bun.serve(). Don't use vite. HTML imports fully support React, CSS, Tailwind.

Server:

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>

With the following frontend.tsx:

import React from "react";
import { createRoot } from "react-dom/client";

// import .css files directly and it works
import './index.css';

const root = createRoot(document.body);

export default function Frontend() {
  return <h1>Hello, world!</h1>;
}

root.render(<Frontend />);

Then, run index.ts

bun --hot ./index.ts

For more information, read the Bun API docs in node_modules/bun-types/docs/**.mdx.

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Rettend

View profile

View on GitHub

GitHub Stars0

CategoryDevelopment

Updated7mo ago

Forks0

Rettend/bun

Trust signals

74/100

From repository metadata: license, adoption, age and documentation. Not a code audit — see the Safety scan above for what the skill file itself contains.

1 medium2 low

bun