when user click logout button that time candeactivate automatic call and show after logout popup can you leave this page

Question

I want to code when user click On logout button candeactivate automatically call to.. after that logout want to show logout popup which is "can you leave this page"

import { CanDeactivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
canDeactivate(component: FormComponent, currentRoute: ActivatedRouteSnapshot, currentState: RouterStateSnapshot, nextState?: RouterStateSnapshot) 
{
// nextState apply in your code
  if (nextState.url == "/auth/login") {
     return true;
     } 
     else
     {
      //write here logic
     }