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I don't think Deno actually re-implements typescript, does it? Seems like a lot of wasted effort. They don't even use Typescript internally.

Reimplement in the way that they change certain rules to accommodate a more "modern JS" feel

And they absolutely use TS for the std library, just not in the runtime itself

> Reimplement in the way that they change certain rules to accommodate a more "modern JS" feel

What exactly do you mean by this?

> And they absolutely use TS for the std library, just not in the runtime itself

Yes, internally. The code that actually makes up deno itself is just plain Javascript.