bun-1-3-12

name	bun-1-3-12
description	Complete toolkit for Bun 1.3.12 JavaScript runtime, package manager, bundler, and test runner. Use when building high-performance Node.js-compatible applications, migrating from npm/yarn/pnpm workflows, bundling JavaScript/TypeScript projects, running Jest-compatible tests, or developing full-stack applications with native HTTP servers, SQLite, Redis, and WebAssembly support.
version	0.1.0
author	Tangled <[e-mail]>
license	MIT
tags	["javascript","typescript","runtime","package-manager","bundler","test-runner","nodejs-alternative","web-development"]
category	development
external_references	["https://bun.sh/docs","https://github.com/oven-sh/bun"]

Bun 1.3.12

Overview

Bun is an all-in-one toolkit for JavaScript and TypeScript applications. It ships as a single, dependency-free executable called bun and includes four integrated tools:

• Runtime — A fast JavaScript runtime designed as a drop-in replacement for Node.js. Written in Zig and powered by Apple's JavaScriptCore engine, Bun starts up ~4x faster than Node.js with lower memory usage.
• Package Manager — A Node.js-compatible package manager up to 25x faster than npm install, with global caching, workspaces, overrides, and lockfile support.
• Test Runner — A Jest-compatible, TypeScript-first test runner with snapshots, DOM testing, watch mode, and concurrent execution.
• Bundler — A native bundler for JavaScript/TypeScript/JSX/CSS with code splitting, plugins, HTML imports, and hot reloading.

Bun supports TypeScript (.ts), TSX (.tsx), JSX (.jsx), and JavaScript (.js) out of the box with zero configuration. Every file is transpiled on the fly by Bun's fast native transpiler before execution.

When to Use

• Building high-performance JavaScript/TypeScript applications that need faster startup and runtime than Node.js
• Migrating from npm/yarn/pnpm to a faster package manager
• Bundling JavaScript/TypeScript projects for browser or server deployment without webpack or esbuild
• Running Jest-compatible tests with native TypeScript support
• Developing full-stack applications with Bun.serve HTTP server
• Using built-in SQLite, Redis, WebSockets, TCP/UDP, DNS, and FFI APIs
• Working with native file I/O, streams, binary data, and WebAssembly
• Running CLI tools via bunx (equivalent to npx, ~100x faster)

Core Concepts

Single Binary: Bun ships as one executable — no separate installs for runtime, package manager, bundler, or test runner. The same bun command handles everything.

JavaScriptCore Engine: Unlike Node.js (V8), Bun uses Apple's JavaScriptCore, the engine behind Safari. This provides faster startup times and lower memory usage while maintaining Web-standard API compatibility.

Zero-Config TypeScript: .ts, .tsx, .jsx files execute directly — no tsc, Babel, or build step needed. Bun transpiles on the fly. For type checking, install as a dev dependency.