Angular Router

Chapter 6. Router State

During a navigation, after redirects have been applied, the router creates a RouterStateSnapshot .

What is RouterStateSnapshot?

interface RouterStateSnapshot {
  root: ActivatedRouteSnapshot;
}

interface ActivatedRouteSnapshot {
  url: UrlSegment[];
  params: {[name:string]:string};
  data: {[name:string]:any};

  queryParams: {[name:string]:string};
  fragment: string;

  root: ActivatedRouteSnapshot;
  parent: ActivatedRouteSnapshot;
  firstchild: ActivatedRouteSnapshot;
  children: ActivatedRouteSnapshot[];
}

As you can see RouterStateSnapshot is a tree of activated route snapshots. Every node in this tree knows about the "consumed" URL segments, ...