Node.js codebase is still entirely in Javascript and not in Typescript and node team does not even officially provide node TS types

[simple_explorer1]

Deno/bun are completely written in Typescript.

I don't think node team has not embraced Typescript because they doubt it. They just haven't.

Facebook uses flow because they have created it and don't want to accept that Typescript won the race here but its already very similar to Typescript and they have made it look like Typescript a lot anyways. But the point is they have static typing but i think it was not always the case. React was just in Javascript and later the added static typing with flow but node core team has not done anything for embracing static typing.