bun is like postcss, babel, node & webpack in one 100x faster tool for building modern web frontends.

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for macOS (x64 & Apple Silicon) and Linux x64

more precisely, bun is a very new:

you can use bun with Next.js and Create React App. bun does not support AST plugins yet, but it will.

"faster" means end-to-end. that includes incremental/hot reloads and cold start time. on a 2019 macbook pro (intel), hot reloads for css & jsx files typically go from save → browser in under 4ms. bun's http server typically starts in under 3ms.

bun is written in Zig, a low-level LLVM frontend (like Rust) that compiles to native code.