I can absolutely understand that coming from coffeescript (optional parentheses resolution... yikes).

But TypeScript is basically "Javascript + types + ES6". They call it an "erasing compiler" because it's not meant to do much but remove types/make ES6 code work with ES5.

There is one gotcha in name resolution when you're working in modules (if you are in a module a.b, and a.c exists, then c will automatically refer to a.c, even if a global c exists). But that usually gets caught by the type system. Lot less issues than coffeescript IMO