[G3rn0ti]

Biggest reason for the success of TypeScript is it aids IDEs in statically analyzing your code and providing enhanced autocompletion results like e.g. methods and properties. In dynamically typed languages this a much more difficult task and can only be approximated by applying some heuristics without actually executing your code.

This is definitely an advantage! No dispute here. But whether static types make programs safer and their architecture cleaner is something in need to be proven empirically. And as others already wrote: There is a reason why dynamic scripting languages became popular.