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Microsoft agentically ports Copilot runtime to Rust for $120K

48 points · 62 comments · pjmlp

  1. tecoholic · · focus · HN ↗

        One of the thorniest conversions was the session.ts file, which was over 30,000 lines of TypeScript that touched all aspects of the runtime.
    This can’t be real. Single file with 30K lines? Which human being is working on it and how much RAM does it take for a code editor to load that with full symbol tree? I am genuinely curious. Is this common? I think most files I come across stretch to maybe 2-3k lines max.
    1. brewmarche · · focus · HN ↗
      Until recently the .NET garbage collector used to be a single 30,000+ line C++ file. And it was maintained by one person if I remember correctly.
      1. tecoholic · · focus · HN ↗
        Amazed and horrified at the same time.
        1. brewmarche · · focus · HN ↗
          Just checked it and I underestimated. Just before the split it was at 54k LOC: &lt;<a href="https:&#x2F;&#x2F;github.com&#x2F;dotnet&#x2F;runtime&#x2F;blob&#x2F;b96f3cc738f7fca9474fbe1116148b118eb6563e&#x2F;src&#x2F;coreclr&#x2F;gc&#x2F;gc.cpp" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;dotnet&#x2F;runtime&#x2F;blob&#x2F;b96f3cc738f7fca9474fb...&gt;

          I’ve also read that a first version of the file came from a Common Lisp to C++ code generation step: &lt;<a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=23295041">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=23295041&gt;

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