move these require statements to the bottom of the app.ts - removing them is a TODO
move these require statements to the bottom of the app.ts - removing them is a TODO

ng-book/angular2-rxjs-chat,ng-book/angular2-rxjs-chat,ahmadassaf/Angular-RxJS-Chat,ng-book/angular2-rxjs-chat,ahmadassaf/Angular-RxJS-Chat,ng-book/angular2-rxjs-chat,ahmadassaf/Angular-RxJS-Chat