Buz: A Modern Zig Fork of Bun with Sub-Second Incremental Builds

Buz – A fork of Bun using modern Zig, with sub-1s incremental builds

I am developing Buz, a work-in-progress fork of Bun built with modern Zig to replace its Rust-based successor. By porting the entire build graph to build.zig, I have achieved sub-one-second incremental rebuilds, significantly improving the developer loop. My goal is to create a drop-in replacement with a saner codebase by removing over 11,000 lines of dead code and relying more on Zig's standard library. While currently using LLMs to tackle the inherited technical debt, the long-term vision is a maintainable project that rivals the performance of the original.