Angular 2 equivalent of Ember.Computed('Prop1','Prop2'...'prop n')

I am trying to port my Ember Application to Angular 2 , but i failed to see how can I create
Computed Properties--Properties observing other properties for changes and the reacting
in Angular 2.

[(myVar)] &&  onMyVarChange= new EventMitter();

Observes changes to it self and the react.

Any help/directions will be great.