[kayoone]

Thats not really what he asked though. If in the end a developer can work 98% in TS, do they really care if it runs as JS or something else if it solves their problems with the language ? I have heard from people that love TS, but surprisingly many that also prefer pure ES6 JS.

[Clubber]

The only concerns I would have is I believe you have to debug the javascript rather than the typescript.

[thomasrognon]

You can make the sourcemaps refer to the TypeScript code. I set breakpoints in TypeScript files and step through it all the time.