What problem it solves

JavaScript and TypeScript development often requires separate tools for execution, package management, testing, and scripting. Bun addresses this by combining these capabilities in a single executable that can be used in existing Node.js projects with little to no changes.

Key features

• JavaScript and TypeScript runtime — Run JavaScript and TypeScript applications, including JSX, through the `bun` runtime. It is written in Rust and powered by JavaScriptCore.

  Source: README

• Integrated package management — Install packages, execute packages with `bunx`, and manage dependencies through a Node.js-compatible package manager.

  Source: README

• Built-in test runner — Run tests with `bun test`, with additional documentation covering mocks, snapshots, coverage, discovery, and reporters.

  Source: README

• Script and package runner — Run package.json scripts through `bun run` and execute individual packages through `bunx`.

  Source: README

• Bundling and compilation — Bundle applications, compile standalone executables, and use bytecode caching through the tool's bundler and compiler capabilities.

  Source: README

Quick start

Copied verbatim from the project's README.

# with install script (recommended)
curl -fsSL https://bun.com/install | bash

# on windows
powershell -c "irm bun.sh/install.ps1 | iex"

# with npm
npm install -g bun

# with Homebrew
brew tap oven-sh/bun
brew install bun

# with Docker
docker pull oven/bun
docker run --rm --init --ulimit memlock=-1:-1 oven/bun

bun run index.tsx             # TS and JSX supported out-of-the-box

Who it may suit

This toolkit may suit JavaScript and TypeScript developers who want runtime, package management, testing, scripting, and bundling in one command-line tool. It may also suit teams maintaining existing Node.js projects that want to adopt the bundled tools with minimal changes.

Topics to discuss

• Which Node.js compatibility areas should the community prioritize next?

• How can the built-in runtime, package manager, test runner, and bundler be integrated more effectively into existing projects?

• What community examples would be most useful for TypeScript, testing, packaging, and deployment workflows?

Written by ReadmeX AI from the project's README, source and public GitHub data; it may contain mistakes.

Read the original README https://github.com/oven-sh/bun#readme

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