I do quite a bit of library development in TypeScript and one of the biggest wins is with new developers doing their first non-trivial bug fix or refactoring. T

I do quite a bit of library development in TypeScript and one of the biggest wins is with new developers doing their first non-trivial bug fix or refactoring. The compiler has saved us from introducing all sorts of edge-case bugs because it catches downstream impacts that developers who are not intimately familiar with all of the code can introduce. A nice bonus feature is single line jsDoc comments replacing giant blocks of descriptive text.