angularjs - What's the equivalent of state params (Angular 1 & ui-router) in Angular 2?

In Angular 1 and ui-router I used states params a lot to pass data from one state to another (without using URL parameters). Is it possible in Angular 2?

Router, RouteParams, RouterLink and RouteData does not seem to handle this for instance I want to pass a user object from one state to another

this does not seem possible in Angular 2.