otpValidator property

Implementation

StreamTransformer<String, String> otpValidator =
    StreamTransformer<String, String>.fromHandlers(
      handleData: (String otpCode, EventSink<String> sink) {
        final String? error = OtpValidator().validate(otpCode);
        error != null ? sink.addError(error) : sink.add(otpCode);
      },
    );