TypeScript is on the rise and now with Angular2 supporting it, it's popularity is sure to continue growing and it's not without reason.

I've already used it on a couple of applications and I've found it aids a maintainable project structure and gives me the type safety I'm used to in C#.

It allows the developer to use new language features that aren't quite supported yet (it compiles to ECMAScript5), offers strong typing which is great for allowing IDEs to provide better intellisense and check for errors at compile time.