In an effort to keep synchronized with router changes in Angular 2, this implementation of the Component Router (ngComponentRouter module) has been deprecated and will not receive further updates. We are investigating backporting the Angular 2 Router to Angular 1, but alternatively, use the ngRoute module or community developed projects (e.g. ui-router).
The singleton instance of the RootRouter type, which is associated with the top level $routerRootComponent.
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https://code.angularjs.org/1.6.8/docs/api/ngComponentRouter/service/$rootRouter