[jdxcode]

Do you use Babel to polyfill JS? Minify? Concatenate? You’re transpiling. And not much more than TS. There is very little logic change that TS does and most of it is essentially the same as what Babel would do for polyfill reasons.

[jeffmcmahan]

I'm not OP, but in my case, no. I don't. I write a roughly ES7, and if you're on an ancient phone/PC, oh well. I really don't care. Not because people using those devices don't matter, but because I am writing code for a company in which I have a say in what hardware/software is provided to employees. I don't have to support IE. That's true of a lot of developers, for whom Babel is a waste of time.