I think you're confusing your application with the language itself. Adding new syntax and functions to the language is not a breaking change. Old code will con

I think you're confusing your application with the language itself. Adding new syntax and functions to the language is not a breaking change. Old code will continue to work. If you start using these new features in your application, and it no longer works on old browsers, then sure that's a breaking change. But that's a choice for you to make. The language is still backwards compatible.