What is this?
Bun is an all-in-one JavaScript and TypeScript toolkit that bundles a runtime, bundler, test runner, and package manager into a single executable called bun.
Bun is an all-in-one JavaScript and TypeScript toolkit that bundles a runtime, bundler, test runner, and package manager into a single executable called bun.Is this a replacement for Node.js, or something I add on top of it?Bun's core is a drop-in replacement for the Node.js runtime, written in Rust and powered by JavaScriptCore instead of V8, so it runs most existing Node projects with little to no changes.
Bun's core is a drop-in replacement for the Node.js runtime, written in Rust and powered by JavaScriptCore instead of V8, so it runs most existing Node projects with little to no changes.How do I install it and start using it?Install the single bun executable for your OS, then run scripts with 'bun run', manage packages with 'bun install/add', and bundle with 'Bun.build'.
Install the single bun executable for your OS, then run scripts with 'bun run', manage packages with 'bun install/add', and bundle with 'Bun.build'.Do I need Node.js or npm installed first?No, Bun replaces them: it has its own npm-compatible package manager and a Node.js-compatible runtime, so you don't need Node or npm installed separately.
No, Bun replaces them: it has its own npm-compatible package manager and a Node.js-compatible runtime, so you don't need Node or npm installed separately.Any gotchas before I switch my project over?On Linux, kernel 5.6+ is strongly recommended (5.1 minimum), and some CPUs may hit 'illegal instruction' errors if requirements aren't met; check Bun's CPU requirements doc if that happens.
On Linux, kernel 5.6+ is strongly recommended (5.1 minimum), and some CPUs may hit 'illegal instruction' errors if requirements aren't met; check Bun's CPU requirements doc if that happens.How do I stay up to date with new releases?Run the upgrade command to get the latest stable release; Bun also publishes a canary build automatically on every commit to main for testing newer changes.
Run the upgrade command to get the latest stable release; Bun also publishes a canary build automatically on every commit to main for testing newer changes.Does Bun include its own server and database APIs?Yes, it ships built-in APIs like Bun.serve for HTTP servers, WebSockets, bun:sqlite, Bun.sql for PostgreSQL, Bun.redis, and an S3 client, among many others.
Yes, it ships built-in APIs like Bun.serve for HTTP servers, WebSockets, bun:sqlite, Bun.sql for PostgreSQL, Bun.redis, and an S3 client, among many others.Can I use Bun for React or JSX projects?Yes, Bun has built-in JSX support and documented guides for using React, Next.js, Vite, Remix, Astro, and other frontend frameworks with Bun.
Yes, Bun has built-in JSX support and documented guides for using React, Next.js, Vite, Remix, Astro, and other frontend frameworks with Bun.What can the built-in test runner and bundler do?bun test runs tests with mocks, snapshots, and code coverage built in, while Bun.build bundles JavaScript/TypeScript, CSS, and HTML, and can even produce a single-file executable.
bun test runs tests with mocks, snapshots, and code coverage built in, while Bun.build bundles JavaScript/TypeScript, CSS, and HTML, and can even produce a single-file executable.What are similar projects?rspack, esbuild, oxc, tsx, closure-compiler, WasmEdge, scriptc, browserify
rspack, esbuild, oxc, tsx, closure-compiler, WasmEdge, scriptc, browserifyWhich topics is it in?bundler, transpiler, rust-lang, jsx, runtime, bun, package-manager, web-framework, sqlite, testing, postgresql, performance
bundler, transpiler, rust-lang, jsx, runtime, bun, package-manager, web-framework, sqlite, testing, postgresql, performance