Person

Jarred Sumner

2 articles First covered May 10, 2026, latest May 15, 2026

GitHub Open Graph card for oven-sh/bun pull request #30412, the Rust rewrite merge.

Bun's million-line Rust rewrite is now mainline. 99.8% of tests pass and 13,000 unsafe blocks remain.

Jarred Sumner merged the Bun-in-Rust PR on May 14, ending Zig as Bun's runtime language. Binary shrinks 3-8 MB; one analysis counted 13,000 unsafe blocks.

The Register's coverage of Bun's experimental Zig-to-Rust port

Open Source·5 days ago

Jarred Sumner rewrote 960,000 lines of Bun from Zig to Rust in six days. He might throw it all away.

Bun's creator used Claude to port the JavaScript runtime from Zig to Rust, hitting 99.8% test compatibility. He says there's a 'very high chance' it gets scrapped.