Tags: Code Migration

Bun Migrates 530,000 Lines of Code from Zig to Rust in 11 Days Using Claude Fable 5

Jarred Sumner, creator of Bun, used Claude Fable 5 to migrate 530,000 lines of Zig code to Rust in 11 days. The upcoming Bun 1.4 will feature Rust. Major results include eliminating memory leaks and reducing binary size by around 20%.

July 10, 2026

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