Yeah that slide is a little confusing because they messed up the second step. JS Facade is supposed to be where Dart Facade is and vice versa. Also, Angular 2.

Yeah that slide is a little confusing because they messed up the second step. JS Facade is supposed to be where Dart Facade is and vice versa. Also, Angular 2.0 is going to be written in TypeScript (which will be compiled to plain JS) but you can use ES5, ES6, TypeScript or Dart depending on what you want to use for your application.