'Buz' Forks Bun From Just Before the Rust Rewrite, Deletes 11,000 Lines of Dead Code, and Gets Sub-Second Incremental Builds in Zig
Developer jazzzooo announced Buz on July 24, 2026: a fork of Bun taken from the last commit before Bun's migration to Rust, rebuilt against modern Zig (upstream commit `2b1c663` with light patches for incremental builds) and achieving sub-1-second incremental compiles. Over 11,000 lines of dead code were removed in the process. The author is upfront that it is 'nowhere near ready for production' — tests were imported from Rust-era Bun and many still fail — with drop-in parity as the stated goal. The 284-point Hacker News thread is less about JavaScript runtimes than about a pattern worth watching: when a project rewrites in a new language, the pre-rewrite tree becomes a viable fork point for people who preferred the old one.
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