doneit-web/src/app/guards/login.guard.ts

import { Injectable } from '@angular/core';
import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree, Router } from '@angular/router';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class LoginGuard implements CanActivate {
  constructor( private router:Router) {

  }
  canActivate(
    route: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {

      if(window.location.pathname == '/' && localStorage.getItem('UserData') != null ) {
        this.router.navigate(['/home/events']);
        return false
      } else {

        return true
      }
  }
  
}