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I do not know vscode but Atom's C++ parts are in a separate repo https://github.com/atom/superstring

I agree. Afaik the core of the editor logic in VsCode is all typescript.

There are some native parts, like obviously electron. And I think the find-in-files function uses ripgrep, which is written in rust. But that's a far stretch from "increasing parts of it being re-written in C or C++".

not always true, sometimes they use better data structures

https://code.visualstudio.com/blogs/2018/03/23/text-buffer-r...

That's a really interesting link; thanks.