Bun 1.0 | Bun Blog
Bun is a fast, all-in-one toolkit for running, building, testing, and debugging JavaScript and TypeScript, from a single file to a full-stack application. Today, Bun is stable and production-ready.
Bun is fast because it uses the JavaScriptCore (Safari) engine,
while Node.js uses the JavaScript V8 (Chrome) engine.
The former has been optimized for faster startup time.
link from:
performance-oriented server-side JS runtime built atop JavaScriptCore is a big deal in the Node world nonetheless as the only other runtime to claim it’s “a drop-in replacement for Node.js.” It’s worth a look, though folks have had mixed results so far regarding the drop-in claim.