Bun Ported to Rust in 6 Days: Stunt or Strategy?

Jarred Sumner, the mastermind behind Bun, is no stranger to bold moves. This time he decided that Zig is so last year and ported a significant chunk of the runtime to Rust in just 6 days. Yes, six days — roughly the time it takes the average developer to set up a new project's CI pipeline.

According to Sumner, the result is already functional and even shows performance improvements. Whether this becomes a full-fledged replacement or just a hype-driven Proof of Concept remains to be seen. But the sheer audacity of rewriting a runtime in a week is either impressive or terrifying, depending on your tolerance for yak shaving.

The internet is, predictably, on fire. Some hail it as genius, others cry overengineering. But let's be honest: the real reason is probably just wanting to try Rust in production because "why not?" After all, if your project has been rewritten three times already, what's one more?

METABYTE's take: Porting Bun to Rust in 6 days is a cool flex, but we wouldn't recommend trying it on your production codebase without a solid test suite. That said, if you need to migrate legacy to Rust, we can help you do it without the all-nighters.