Fixes 155 issues (addressing 642 👍). New native REPL, --compile --target=browser for self-contained HTML, TC39 standard ES decorators, Windows ARM64 support, barrel import optimization, and a faster event loop. structuredClone up to 25x faster for arrays, Buffer.slice() 1.8x faster, path.parse() up to 7x faster, fewer closures in bundled output, and upgraded JavaScriptCore with 168x faster deep rope string slicing. Fixes Python asyncio-based MCP servers breaking with Bun.spawn(), plus numerous bugfixes across Node.js compatibility, bun install, the bundler, shell, and Windows.
Bun's REPL has been completely rewritten in Zig, replacing the previous third-party npm package. The new REPL starts instantly without downloading any packages, and includes a full-featured terminal UI.
In the next version of Bun
Bun gets a native REPL pic.twitter.com/RLtaUymgWu
Features:
You can now use bun build --compile --target=browser to produce self-contained HTML files with all JavaScript, CSS, and assets inlined directly into the output. This supports TypeScript, JSX, React, CSS, ESM, CJS, and everything else Bun's bundler already supports.
