Bun Rewritten in Rust Using Claude
The Decoder · rss · 2026-07-10
Bun has completely rewritten its implementation from Zig to Rust, with a massive amount of code generated by Anthropic's Claude Fable 5.
Key facts of this rewrite:
- The language stack switched from Zig to Rust.
- Claude Fable 5 handled the primary code generation during the migration.
- Over 1 million lines of code were written in just 11 days.
The highlight here isn't just the "language switch," but a demonstration of the actual scale of output AI can achieve in massive engineering refactors.
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