gistfile1.txt

export function emailExistsValidatorFn(userService: UserService, trueOnExists: boolean): AsyncValidatorFn {
  console.log('validator triggered');
  return (control: AbstractControl): Promise<ValidationErrors | null> | Observable<ValidationErrors | null> => {
    console.log(userService);
    return userService.checkIfEmailExists(control.value, trueOnExists).pipe(
      take(1),
      map((result: boolean) => {
        console.log(result);
        console.log('psovi nic');
        return result ? null : {'emailexists': true};
      })
    );
  };
}