I work on Dart at Google. We have used Dart internally for critical applications for over a year now. It's pretty mature at this point, even if there are some s

I work on Dart at Google. We have used Dart internally for critical applications for over a year now. It's pretty mature at this point, even if there are some specific areas that are still evolving (async/await, reflection, js interop to name a few). Dart is significantly better than JavaScript (IMO, of course), that's what it was designed for. Mostly it comes down to sane semantics and static analyzability.