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bun

Assists with using Bun as an all-in-one JavaScript/TypeScript runtime, package manager, bundler, and test runner. Use when building HTTP servers, managing packages, running tests, or migrating from Node.js. Trigger words: bun, bun serve, bun install, bun test, bun build, javascript runtime, bun runtime.

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TerminalSkills/skills
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  • SKILL.md3.5 KB
  • _scores.json1.5 KB

SKILL.md(원문)

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Bun

Overview

Bun is an all-in-one JavaScript/TypeScript runtime that replaces Node.js, npm, webpack, and Jest with a single binary. It provides native TypeScript support, a high-performance HTTP server (Bun.serve()), a fast package manager, a bundler, and a Jest-compatible test runner with dramatically faster performance.

Instructions

  • When creating HTTP servers, use Bun.serve() which handles 100K+ req/s with built-in WebSocket support, TLS, and streaming responses.
  • When managing packages, use bun install (10-30x faster than npm), bun add, bun remove, and prefer bun.lock (text format) for readable git diffs.
  • When bundling, use Bun.build() with appropriate target ("browser", "bun", "node"), enable code splitting with splitting: true, and configure tree shaking.
  • When writing tests, use bun test with Jest-compatible API (describe, it, expect), snapshot testing, mocking with mock.module(), and --coverage for code coverage.
  • When doing file I/O, prefer Bun.file() and Bun.write() over Node.js fs for significantly faster file operations, and use Bun.Glob for pattern matching.
  • When handling authentication, use Bun.password.hash() and Bun.password.verify() for bcrypt/argon2 instead of npm packages.
  • When migrating from Node.js, replace node with bun in scripts, keep package.json unchanged, and note that most npm packages work without modifications. Use bun:sqlite for embedded databases instead of SQLite npm packages.

Examples

Example 1: Build a high-performance API server

User request: "Create a REST API using Bun's built-in HTTP server"

Actions:

  1. Create server with Bun.serve() and route handler
  2. Parse JSON bodies with request.json() and return Response objects
  3. Add WebSocket upgrade for real-time features
  4. Use Bun.password for auth and bun:sqlite for data storage

Output: A fast API server using only Bun built-ins with no external dependencies.

Example 2: Migrate a Node.js project to Bun

User request: "Switch my Express project from Node.js to Bun"

Actions:

  1. Replace npm install with bun install in CI and local setup
  2. Update package.json scripts to use bun run instead of node
  3. Replace dotenv with Bun's built-in .env loading
  4. Switch test runner from Jest to bun test with same test files

Output: A Bun-powered project with faster installs, startup, and test execution.

Guidelines

  • Use Bun.serve() for new HTTP servers; it is significantly faster than Express on Bun.
  • Prefer Bun.file() and Bun.write() over Node.js fs for file operations.
  • Use bun:sqlite for local data instead of adding SQLite npm packages.
  • Use Bun.password for auth instead of bcrypt/argon2 npm packages for zero native dependencies.
  • Keep bun.lock (text format) in git for readable diffs.
  • Test with bun test instead of Jest for the same API with dramatically faster execution.
  • When targeting browsers, use Bun.build() with target: "browser".

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