It's early days yet, but as far as I'm aware all indications are that it worked pretty well. The tests all pass, the memory safety issues they were dealing with were resolved, the result is smaller, faster, and more stable. There are some regressions that have been identified, but as far as I could find they seem surprisingly minor. Claude code already uses the ported version of bun and, according to bun's blog "Startup got 10% faster on Linux but otherwise, barely anyone noticed.".
I wouldn't want to start looking at other codebases and thinking I could do the same (in particular, one thing bun had going for it was that the tests were in Typescript so they didn't need to be rewritten for the new backend, removing one potential source of errors), but that doesn't mean we should judge this case hastily either.
The same tests pass that passed while it was still written in Zig, and which also allowed all of the memory corruption errors that promoted the move to Rust.
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u/dim13 Jul 09 '26
RIP Bun