V8 is C++, so why isn't it "C++ powered"?

Technically you could say that, but the entire server runtime is written in Rust. V8 is just the embedded JavaScript engine. By that logic, every Node.js or Deno app would be "C++ powered" since they all use V8.

How big is the server runtime compared to v8 under the hood?

Yes, every one of those apps is c++ powered.

They are using Deno

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