Rust Port of TypeScript (Tsc)

(github.com)

42 points | by jcbhmr 1 hour ago

12 comments

  • yoyohello13 33 minutes ago
    Maybe there are just so many of these but at this point for vibe coded stuff like this I’m just like “who cares.” LLMs can make stuff like this now. Unless this reaches some critical mass of usage among developers why would I use it? It’s just a less maintained, less tested implementation. The more important question is “what does this teach us?” And idk the answer to that one.
    • rowanG077 29 minutes ago
      Generally building something is not about "What does this teach us?" but rather "What can this be used for?". You don't build a house and as "What does this teach us?". It's honestly almost a perverse question to primarily ask for something that aims to have practical value.

      The clear reason this has worth is that it's much faster than TSC.

      • Capricorn2481 24 minutes ago
        That's why the commenter said

        > It’s just a less maintained, less tested implementation

        Then they asked if it teaches something because it is a risky utility to them. You're trying to make it sound a lot weirder.

        • rowanG077 17 minutes ago
          The point is that it's clearly not just a less maintained, less tested implementation. It's 1.61x faster for one in real world apps, in some case even almost 4x faster.
          • anonymous908213 4 minutes ago
            Cherry-picking benchmarks does not mean it is not less maintained and less tested. I have seen a hundred cases by now of amazing LLM-generated benchmarks that fall over at second glance. Maybe this will one will be a rare exception, but including a benchmark in your repo does not itself prove anything, and even if it is faster in real-world use cases, that is not mutually exclusive with having more bugs.
          • Capricorn2481 6 minutes ago
            If that was your point, why did you spend a whole paragraph saying "teach us? What a perverse question."
          • Onavo 8 minutes ago
            I am curious why it's faster. Golang isn't that much slower than Rust, aside from the garbage collector. 4x performance improvements is much bigger than what I expected.
  • DanRosenwasser 1 hour ago
    TypeScript team member here - this is impressive work, and it's honestly crazy that 3 of these ports have popped up in the last week! I'm currently AFK but we're hoping to learn more and we'll have more to say on this soon.
    • aizk 31 minutes ago
      I think the future of this is -- get your AI agent to investigate this port for anything actually worthwhile, comparing it to the go version, and then take those good ideas and actually maybe bring them into the real compiler.

      Maybe. Who knows, it's all changing so fast!

    • vaughands 55 minutes ago
      Kudos for keeping up! Golang seemed like a very reasonable choice when you ported there originally but the world is changing _fast_.
      • zdragnar 48 minutes ago
        Why do you think Golang is no longer a reasonable choice?
        • vaughands 40 minutes ago
          I suppose my comment sort of implies this. I think the naive knee jerk reaction is that if you can spit out perfect machine level code against a specification, then logically being closer to bare metal would help with performance. However, without knowing the details of how things worked it is tough to say whether it is truly "reasonable" or not.

          But more importantly, the Typescript team themselves [1] picked Golang mostly out of ergonomics and ease of porting at the time. It is becoming more increasingly more to "taste" what ergonomics means. Notably, they did not pick it because they believed it to be the fastest option. But speed was on the mind, giving way to ergonomics and ease of porting. At least, this is my read.

          [1] https://github.com/microsoft/typescript-go/discussions/411

          • dunham 26 minutes ago
            The author of esbuild used Rust and later switched to Go. He describes some of his experience here:

            https://news.ycombinator.com/item?id=22336284

            It is one person and one project, but I found it interesting to read about his experience.

            I like Go, but I probably would have tried Rust first because I want pattern matching when implementing languages.

        • lifthrasiir 44 minutes ago
          Presumably because Rust is more suitable than Go in agentic coding? (I'm not sure, but that seems the purported answer.)
          • lifeisloving 17 minutes ago
            Language and compiler design/ implementation is very much a human task. There's lots of nuances to consider. I doubt they want agent spaghetti code in their codebase either.
        • spankalee 41 minutes ago
          Rust is better at targeting WebAssembly
          • cowsandmilk 10 minutes ago
            why would that be important? Having a typescript compiler in wasm seems like a pretty niche need.
          • teki_one 33 minutes ago
            Why?
            • spankalee 12 minutes ago
              Wasm is a first-class target for Rust, which produces faster and smaller Wasm binaries. My understanding is that you need to use TinyGo to reasonably target Wasm with Go.

              Go having a garbage collector isn't necessarily bad, since Wasm has GC, but I think Go's GC can't easily use Wasm GC because Go has interior pointers.

            • 0x696C6961 26 minutes ago
              I think the main advantage is size. Rust doesn't need to include the runtime.
            • cmrdporcupine 24 minutes ago
              I'm assuming they mean because it doesn't need a garbage collector or much of a runtime at all. You can target direct to WASM and use I guess WASI, while Go brings with it a garbage collector and so on.
        • conartist6 17 minutes ago
          Was it ever a reasonable choice? At the time the choice was made the tooling ecosystem was already split between Rust and JS, and by putting TS in Go they chose to split it three ways. Why not split it 4 or 5 ways then? The pressure will always be towards less duplicated work.

          The only real choice of language to build the next generation of JS tools in is JS. Anything else is a vote of no confidence in ourselves.

  • hannibalhorn 17 minutes ago
    In the real world project section, compile times vs tsc7 were 1-3s less. Sometimes the percentages are far more impressive than absolutes.
  • shepherdjerred 11 minutes ago
    I wish Anthropic/OpenAI would give me free tokens so I could make random things like this

    I already pay for subs on both but the tokens are already spoken for with other projects

  • pvillano 44 minutes ago
    I have to wonder if LLM reimplementations verified against years of human tests will have holes where original authors thought that tests are not necessary and common sense is enough.

    I have to wonder this to preserve my ego as a human. I wonder have to this because I sure as hell am never going to go through all that code to check.

  • catlifeonmars 38 minutes ago
    This post should be titled “Rust port of Go rewrite of Typescript compiler”
  • fiatpandas 34 minutes ago
    Are there any specific harnesses or techniques to aid in porting stuff to Rust? Specialized in terms of token efficiency
    • hedgehog 31 minutes ago
      As much as possible mechanical (non-LLM) verification of equivalence that generates good diagnostic messages, mechanical translation steps that generate good diagnostic messages, a good memory system to reduce rework...
  • elcritch 56 minutes ago
    I'm curious how much unsafe this uses? Are these ports making idiomatic code or just using unsafe all over. There doesn't seem to be anything in the readme.
  • ingen0s 1 hour ago
    Wait - you spent north of $400,000?
    • Rapzid 23 minutes ago
      People love to flex by using the API costs for their subscription tokens.

      I personally find it ridiculous. The cost is what you paid, not what someone else could have paid. Markets and all that.

      It would be like using spot instances on AWS but flexing by boasting about how much on-demand $$ compute you used.

      • Capricorn2481 7 minutes ago
        In this case, I think they are just giving you an idea of what it cost to do this. They aren't saying it's prescriptive
    • sghiassy 48 minutes ago
      Assuming he used $400,000 in tokens, but used subs

      I wonder how much AI companies lost on this?

      Edit: not that I’m worried about them, I’m just curious

      • esperent 36 minutes ago
        > I wonder how much AI companies lost on this?

        Probably zero, or even a profit. The idea that these companies are making a loss on subscriptions is an unsubstantiated HN fallacy.

        On the contrary, they're probably making a small profit on subscriptions, or at least break even, and absolute bank on API pricing. Anthropic recently reported an 80% gross profit margin, for example.

        https://www.reuters.com/business/retail-consumer/anthropic-t...

        • adrianvincent 19 minutes ago
          Profitable, if you just ignore how much money they spend
        • janalsncm 16 minutes ago
          Excited for their IPO just to put this to bed, one way or another.
      • MBCook 17 minutes ago
        What are “subs”?
    • JacobAsmuth 54 minutes ago
      Most of it was wasted on OpenAI tokens. It actually cost them $24k USD according to the github description.
    • hedgehog 1 hour ago
      Sibling dead comment said it already but that's likely an estimate of what it would cost via API and in practice it was a few hundred or thousand dollars of subscription fees.
    • colomo 1 hour ago
      $420,000 worth of tokens, though I'm pretty sure he used subs.
    • spense 1 hour ago
      > I did over $400,000 in API priced tokens

      i'd bet this is a few subscriptions over a few months rather than paying directly for tokens.

    • kyguy23 1 hour ago
      [dead]
  • fwlr 1 hour ago

        # “The Slop Line"
    
          Everything below this was written by my LLMs, not me.
    
    I really appreciate this convention, thank you.
  • Gigachad 34 minutes ago
    I honestly have no idea what the future of tech will look like at this point. Too much has changed.
  • bitpush 47 minutes ago
    Is this going to be a serious project? No.

    Is this going to be maintained? Nope

    Nevertheless this and many others are showing what is possible. Much akin to how someone ports doom onto a microwave.

    We'll look back at this time with great fondness when we collectively discovered a whole new gear.