Yeah GitHub/TypeScript kinda don't count. I have an ignorant question though : do people use c# or f# in a non-windows system, by choice ? Otherwise, wouldn't that be a self fulfilling need ?
Edit: typo
Edit: typo
I have not used them myself.
Bit of an aside, but TypeScript was invented at MSFT, and they still maintain it – why would it not count? (Other than not being a consumer product).
Sure, but JavaScript was already there, so I don't look at it as a MSFT idea event though I agree it's technically a msft product.