## TL;DR

Bun (Jarred Sumner, 2022) is an all-in-one JavaScript runtime, bundler, test runner, and package manager written in Zig. It aims to replace Node.js with dramatically faster performance (4x+ faster than Node in benchmarks). Uses JavaScriptCore (Safari's engine) instead of V8.

## Core Explanation

`bun install`: up to 25x faster than npm (uses binary lockfile, symlinked node_modules). Bundler: built-in, no configuration needed. Test runner: Jest-compatible. Native support: TypeScript, JSX, SQLite, .env, and Web APIs. Bun 1.0 (Sep 2023): production-ready for macOS/Linux. Bun 1.2 (2025): Windows support. Drop-in replacement for `node` and `npm` in many projects.

## Further Reading

- [Bun Documentation](https://bun.sh/docs/)