Comment by simonw
18 hours ago
As far as I can tell they pull in QuickJS (actually quickjs-ng) only in the case where the program has untyped dependencies that still need to be run by an interpreter - and they chose that library because it's pretty small (620KB). Did I miss something, are they using it outside of that purpose?
They will have untyped dependencies. That’s how the TS/JS ecosystem works.
Note that “untyped dependency” means any code that says `any`.
They won't have untyped dependencies for situations where someone used Scriptc as a way to build a fast binary executable for some custom-written TypeScript, which was the first use-case that came to mind for me.
Being able to build small, fast binaries without writing them in C or Rust - if you're already fluent in TypeScript - seems like a valuable capability.
Yes, being able to build small and fast binaries in TS would be a valuable capability, which is why basically all of us who work in this space have thought of this idea and rejected it after going deep on it. This isn’t a new idea.
CanadaHonk has gotten further than the rest of us. It’s surprising and impressive.
You’re only replying to the quickjs issue I raised, but it’s not the only issue. Their approach to numbers is broken. Their approach to measurement is broken. The quickjs thing raises another red flag: it suggests to me that they are using reference counting, not GC. That’s guaranteed to make them too slow to be useful. (If they weren’t using RC, then they’d have a hard time on the boundary to quickjs.)
As to the `any` issue, let me explain it in a way you’ll appreciate. I asked Claude how likely it is that TS code uses any, and it found:
- 79.5% of TS repos use any explicitly. So, about 4/5 chance that newly written dep-free TS code will use it.
- the explicit any type is about as common as Boolean and void.
- a third of inferred types are any. That’s huge.
So, if you don’t believe me, then at least believe Claude: any is a super common type, so they will be falling off into quickjs a lot.
Oh, and in case it isn’t clear, quickjs-ng is no better than quickjs. They’re the same thing for the purpose of perf
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So like less than 1% of the time? What part of the JS ecosystem doesn’t depend on a mountain of untyped dependencies?
Devil's advocate - this is for the backend. You get to control your dependencies there, and I'd say Vercel controls its own stack, so they can replace deps as they go by submitting patches/slopforking projects to remove incompatible features.
> "As far as I can tell they..."
This phrase I think highlights the fundamental issue for a lot of folks that would otherwise consider adopting a project like this written by humans.