Rewriting Bun in Rust
Summary
Simon Willison's blog post details Jarred Sumner's Zig-to-Rust rewrite of Bun, examining the motivations for Rust, memory-management challenges, and the use of AI-assisted workflows to port and test the project. The piece highlights a conformance suite built in TypeScript, adversarial review, and LLM-assisted code generation, as well as token-cost considerations in Claude Code deployments. It illustrates how AI and automation can accelerate large-scale software rewrites.