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In my experience Bun in Zig compiles more slowly than Deno in Rust.
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Single compiles for sure. Where Zig is optimizing compilation is in the incremental compiler, which I've seen compile the compiler itself in an instant after a single line change. Of course, that kind of speed is probably not interesting to some people if the AI is writing tons of lines of code before they go to the compilation step.
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I found making single line changes in Bun’s zig code led to very long compiles compared to doing the same in Rust code. It was a while ago though and maybe I was doing something wrong.
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Probably a very long time ago then. Try again with Zig 0.16. It's amazing how fast recompiles can be.
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They can't, because Bun is tied to a fork of Zig 0.14 which is not compatible with regular Zig compiler.
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  how long does it take to compile?

  @jarredsumner: It's basically the same as in zig using our faster zig compiler. If we were using the upstream zig compiler, rust port would compile faster.
https://x.com/jarredsumner/status/2053050239423312035
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