RxJs and Angular1 component - how to avoid $scope?

Pseudo code for angular 1.5 component with RxJs:

component('demo', {
  template: `<div>
            <div ng-if="verificationFailed">Sorry, failed to verify</div>
            <button ng-if="continueEnabled">Continue</button>
            <button ng-click="verify()">Verify</button>
            </div>`,
  controllerAs: 'ctrl',
  bindings: {
    someOptions: '='
  },
  controller: ($scope, someService) => {
    var ctrl = this;

    ctrl.continueEnabled = false;

    ctrl.verificationFailed = false;

    ctrl.verify = function() {
      Rx
      .Observable
      .interval(10 * 1000)
      .timeout(2 * 60 * 1000)
      .flatMapLatest(_ => { someService.verify(ctrl.someOptions.id)})
      .retry(1)
      .filter((result) => { result.completed })
      .take(1)
      .subscribe(_ => {
        $scope.$evalAsync(_ => {
          ctrl.continueEnabled = true
        });
      }, _ => {
        $scope.$evalAsync(() => {
          ctrl.verificationFailed = true;
        });
      });
    };
  }
});

Any way to avoid using $scope with $evalAsync to trigger digest? Without it the view is simply not updating.
Why? Because there is no $scope on angular2 and i want to make migration as easy as it is possible