JS/TS/JSX toolkit with Bun awareness. Use when using Bun as a runtime, test runner, or package manager in JavaScript and TypeScript projects.
Bun Toolkit
Bun is a fast, all-in-one JavaScript runtime and toolkit.
Core Features
Runtime: Fast JS/TS runtime, drop-in replacement for Node.js.
Package Manager: bun install is significantly faster than npm or yarn.
Test Runner: bun test provides a fast, Jest-compatible testing environment.
Bundler: bun build for bundling JS/TS for the web or other runtimes.
Common Commands
bun init # Start a new project
bun install # Install dependencies
bun add <package> # Add a package
bun run <script> # Run a package.json script
bun <file.ts> # Run a TS/JS file directly
bun test# Run tests
bun build ./index.ts --outdir ./build # Build for production
Awareness & Best Practices
TypeScript Support: Bun supports .ts and .tsx files out of the box. No separate compilation step needed.
Environment Variables: Automatically loads .env files. Access via process.env or Bun.env.
Fast I/O: Use Bun.file(path) and Bun.write(path, content) for high-performance file operations.
HTTP Server: Use Bun.serve({ fetch(req) { ... } }) for an extremely fast built-in web server.
SQLite: Built-in high-performance SQLite driver via import { Database } from "bun:sqlite".
When to use Bun Toolkit
When the project has a bun.lockb file.
When the user mentions "Bun".
When performance is a priority for JS/TS tasks (installing, testing, running).
For quick JS/TS scripts that need high performance.
