Thanks. If I do, it won't be supported beyond the compiler/build tool (no official recommendation of using it w/ limited support).

It's an unpopular opinion, but I view TypeScript in the same light as I do the OPs assertion about cloud-only development. It's adding yet-another-layer that has some merits but often leads to overcomplicated messes that reduce productivity/add confusion.

I'd rather petition for some sort of structs/arg typing to be included in ECMAScript proper (in a similar fashion as to what happened with a lot of Jon Resig's jQuery DOM selection APIs making their way into ES6).