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Data Science
Simon Willison's Blog·28d ago·5 min read
Rewriting Bun in Rust
TL;DR
Bun, a JavaScript runtime, was rewritten from Zig to Rust to address persistent bugs and improve stability. Jarred Sumner highlights the challenges of mixing garbage collection with manual memory management, which contributed to the decision to switch languages.
✦ Why It Matters
Engineers should evaluate their programming language choices based on specific project needs to avoid stability issues.
Key Takeaways
- Evaluate Rust for projects with complex memory management needs.
- Utilize automated testing suites to facilitate code transitions.
- Incorporate AI agents for efficient code generation and review.
- Monitor workflows closely during large-scale rewrites.
How It Works
The rewrite utilized a TypeScript test suite as a conformance tool, allowing AI agents to automate the porting process from Zig to Rust. This approach enabled rapid validation of the new code against the original implementation, significantly speeding up the transition.