gistfile1.ts

return socketService
  .connectSubject
  .first((x) => x)
  .concat(socketService.checkAuth().take(1))
  .flatMap((isLoggedIn) => {
    if (isLoggedIn) {
      return Observable.from(true);
    } else {
      return Observable.fromPromise(socketService
        .getToken()
        .then(token => socketService.refreshToken(token))
        .then(() => true));
    }
  })
  .catch(e => {
    router.navigate(['/Login']);
    return false;
  })
  .toPromise();