In Angular 2+, you can protect routes with guards. The most likely used guard types are CanActivate and CanDeactivate. The first guard type decides if a route can be activated, and the second one decides if a route can be deactivated. In this section, we will discuss CanDeactivate. This is an interface having only one method canDeactivate:
export interface CanDeactivate<T> { canDeactivate(component: T, route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean> | Promise<boolean> | boolean;}
This method can return Observable<boolean>, Promise<boolean>, or boolean. If the value of boolean is true, the user can navigate away from the route. If the value of boolean is ...
