AngularJS 2 has become one of the most popular open source JavaScript frameworks in the world of web application development. Angular 2.0 was officially announced at the ng-conference in October, 2014. AtScript is a superset of ES6 and it's being used to develop Angular 2.0. It's processed by the Traceur compiler (along with ES6) to produce ES5 code and uses TypeScript's type syntax to generate runtime type assertions instead of compile time checks.