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Thats just silly, there are a lot of production ready languages that only have one full implementation such as Typescript, Elixir etc

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It would be pretty hard for a second implementation of TypeScript to gain any share of the market since Microsoft refuses to update the TypeScript specification. They point to tsc and say that is the specification. It is completely unprofessional in my opinion.

> (...) such as Typescript

It seems you're oblivious to the fact that projects such as swc[1] exist, and have been adopted by projects such as deno.

[1] https://swc.rs/

> Elixir etc

I'm not familiar with Elixir nor am I in a googling mood. Nevertheless that was an awfully short list. Why is that?

swc only does transpilation, it does not support TypeScript's type-checking which is its main feature.

The author of swc is currently working on a Rust-port of the type checker: https://github.com/dudykr/stc

Here is an interview with them: https://www.totaltypescript.com/rewriting-typescript-in-rust

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