21CTO

Aug 2, 2026 · Industry Insights

When Bun Switched to Rust, the Zig Community Revived Its Legacy Code as Buz

After Bun migrated to Rust with AI assistance, the Zig community forked its abandoned Zig codebase to create Buz, rebuilt it with a modern Zig toolchain, achieved sub‑second incremental builds, and now enforces AI‑assisted contributions while remaining an experimental, platform‑limited project.