Dart arrived with much fanfare though, whereas TypeScript was more low-key, and it's taken a while to become mainstream. Google's announcement that Angular 2 would use it has brought it a lot more attention from outside of the traditional MS/.NET dev crowd.

Microsoft have also been shifting the project's focus towards a more Babel-esque one, emphasising greater interoperability with existing (untyped) JS libraries, and support for new ES6/2015 features (and beyond).