To upgrade:
bun upgradetab completions for bun run
bun run now has tab completions for zsh and fish that show scripts from package.json and bins from node_modules/.bin.
Install:
bun upgrade
bun completions 
Going forward, bun upgrade also updates completions, so you shouldn't have to do that again.
Bun.js
Bun now has a builtin "supports-color" polyfill, the package used by chalk to detect ANSI color support.
The TypeScript in this screenshot runs 2x faster in Bun.js than in Node.js:
Other stuff:
node-fetch&isomorphic-fetchpolyfills work now. When an npm package importsnode-fetch, Bun.js will automatically replace it with Bun's native implementation.Bun.sleep(ms)lets you synchronously sleep. No promises- Fixed an edgecase with the CommonJS transform that affected
export default(thank you @evanwashere for flagging) - Several more encoding issues specific to the JavaScriptCore integration were found & fixed, though there are a couple more I still need to fix.
JavaScript Lexer
- Fixed a regression with
\0(and added an integration test)
Misc
--versionnow prints a newline at the end-vis now shorthand for--version- Fixed spacing with the CLI help menu (thanks @KishanBagaria for flagging)
-uis now shorthand for--origin. Might rename that to--urlin a future release.