Bun 1.4 release
Archived — this story has rotated out of today’s deck. It is kept here in full.
The gist
Bun 1.4 adds 1,517 Node.js tests, fixes 2,900 issues, and rewrites from Zig to Rust.
The Rust rewrite and AI commits spark community concern over code quality and delays.
Background
Bun is a JavaScript runtime and toolkit aiming for drop-in Node.js compatibility. Version 1.4 was highly anticipated, promising major performance improvements and a rewrite from Zig to Rust. However, the release has been delayed by over three months past its initial target, and the development process has drawn criticism due to heavy reliance on AI-generated commits and a large number of open pull requests.
How it unfolded
- Jul 7, 2026Bun 1.4 was initially targeted for release on this date, but it slipped.
- Aug 19, 2026Criticism mounts as Bun 1.4 remains unreleased, with creator Jarred Sumner repeatedly promising it 'tomorrow' or 'next week'.
- recentlyBun 1.4 is finally released, adding 1,517 Node.js tests, fixing over 2,900 issues, and introducing new features like Bun.Image and Bun.cron().
Who’s saying what
- Support
- Bun has been 'nothing but amazing wins' for some developers, enabling them to do more.
- Caution
- A long-time Bun advocate criticizes the Rust rewrite, citing missed deadlines and concerns about code quality due to AI-generated commits.
- Expert
- Zig creator Andrew Kelley harshly criticized Bun's code quality, calling it 'hacks on top of hacks'.
Still unverified
Claims of over 15,000 AI-generated commits from 'robobun' and over 5,000 open pull requests are based on community reports and not officially confirmed.