Using TypeScript in Angular 2 is completely seamless, and I think most consider it the default, so 'b)' is likely close to what you describe. I don't think you

Using TypeScript in Angular 2 is completely seamless, and I think most consider it the default, so 'b)' is likely close to what you describe. I don't think you could come close to approximating Angular 2's level of TypeScript integration with Ember. The one caveat is that templates have no type checking or refactoring support. This is fairly standard in html templates in any statically typed language framework, but it is still frustrating and unfortunate. You can safely rename a symbol in TypeScript files, and yet not be able to catch the references in templates without find and replace.