Bun 1.4 significantly advances Node.js compatibility by adding 1,517 passing tests from the Node.js test suite, with several core modules reaching 97-100% pass rates. The release also delivers major performance improvements including 5x lower idle CPU usage, up to 35% less memory, and 50% faster startup on Linux, while introducing new APIs like Bun.Image, Bun.WebView, and Bun.cron(). Notably, Bun rewrites its core from Zig to Rust.
Background
Bun is a fast all-in-one JavaScript/TypeScript runtime and toolkit designed as a drop-in replacement for Node.js, originally written in Zig. It has been rapidly improving Node.js compatibility since its 1.0 release.
- Source
- Lobsters
- Published
- Aug 20, 2026 at 10:37 PM
- Score
- 7.0 / 10