Bun’s Rust Rewrite

Jarred Sumner completed a full rewrite of Bun from Zig to Rust, promising significant performance improvements and sharing deep technical insights.

One continuously updated timeline instead of dozens of separate articles. New developments are appended as the story evolves.

1. UpdateJul 8, 2026, 11:57 PM

   Bun’s core engine fully rewritten from Zig to Rust, delivering performance and safety improvements.

   Jarred Sumner completed a full rewrite of Bun from Zig to Rust, promising significant performance improvements and sharing deep technical insights.

   Read the full story →
2. 1 month later
   UpdateAug 10, 2026, 01:09 PM

   Developer analyzes bug count before and after Bun's Rust rewrite

   A developer analyzed bugs in Bun before and after its Rust rewrite, finding significant changes. The rewrite added over 1 million lines of code and changed 2,188 files.

   Read the full story →