The router that is passed to the register function includes makes it possible for plugins to hook into routing of the Backstage app and provide the end users with new views to navigate to.
type RouterHooks = {
registerRoute(
path: RoutePath,
Component: ComponentType<any>,
options?: RouteOptions,
): void;
registerRedirect(
path: RoutePath,
target: RoutePath,
options?: RouteOptions,
): void;
};