Function observableValidator

packages/forms/test/reactive_integration_spec.ts:6342–6346

(resultArr: number[])

}

function observableValidator(resultArr: number[]): AsyncValidatorFn {
  return (c: AbstractControl) => {
    return timer(100).pipe(tap((resp: any) => resultArr.push(resp)));
  };
}

function loginIsEmptyGroupValidator(c: FormGroup) {
  return c.controls['login'].value == '' ? {'loginIsEmpty': true} : null;