Angular 5 - Gmail Logout

one

      (<any>window).gapi.load('auth2', () => {
        (<any>window).gapi.auth2.init().then(() => {
          var auth2 = (<any>window).gapi.auth2.getAuthInstance();
          auth2.signOut().then((res) => {
            if (response.responseCode == 'S0001') {
              window.location.href = '/login';
            }
          })
            .catch((err) => { console.log('error is ', err) });
        });
      });