[jasonkillian]

How well does Babel transpile TS? My initial instinct is that I'd trust the real TS compiler over Babel, but I've never tried compiling TS with Babel.

I assume the real TypeScript compiler still does the type-checking and that would be unaffected by Babel.

[wwwigham]

The TS team implemented the TS parsing support in Babel. You are correct that the TS compiler is still needed for the typechecker, however.

[jasonkillian]

Ah, I didn't realize this, very cool collaboration! For those who are reading this and might find it helpful, here's a link to the official blog post on the work: https://blogs.msdn.microsoft.com/typescript/2018/08/27/types...