How to use the card-validator.cvv function in card-validator

CreditCardForm.prototype._validateCvv = function (value, options) {
  var cvvSize, minLength;

  options = options || {};
  minLength = options.minLength;

  if (this._fieldKeys.indexOf('number') === -1) { // CVV only
    return validator.cvv(value, minLength || [3, 4]);
  }

  cvvSize = this.get('possibleCardTypes').map(function (item) {
    return item.code.size;
  });
  cvvSize = uniq(cvvSize);

  return validator.cvv(value, cvvSize);
};

CreditCardForm.prototype._validateCvv = function (value, options) {
  var cvvSize, minLength;

  options = options || {};
  minLength = options.minLength;

  if (this._fieldKeys.indexOf('number') === -1) { // CVV only
    return validator.cvv(value, minLength || [3, 4]);
  }

  cvvSize = this.get('possibleCardTypes').map(function (item) {
    return item.code.size;
  });
  cvvSize = uniq(cvvSize);

  return validator.cvv(value, cvvSize);
};

test(value) {
                    const { card } = number((this.parent as HostedInputValues).cardNumber);

                    return cvv(value, card && card.code ? card.code.size : undefined).isValid;
                },
            });

export const isCVV = (value) => valid.cvv(value).isValid;
export const isPostalCode = (value) => valid.postalCode(value, 4).isValid;

validateValues = (formValues) => {
    const numberValidation = valid.number(formValues.number);
    const expiryValidation = valid.expirationDate(formValues.expiry);
    const maxCVCLength = (numberValidation.card || FALLBACK_CARD).code.size;
    const cvcValidation = valid.cvv(formValues.cvc, maxCVCLength);

    const validationStatuses = pick({
      number: toStatus(numberValidation),
      expiry: toStatus(expiryValidation),
      cvc: toStatus(cvcValidation),
      name: !!formValues.name ? "valid" : "incomplete",
      postalCode: this._validatePostalCode(formValues.postalCode),
    }, this._displayedFields);

    return {
      valid: every(values(validationStatuses), status => status === "valid"),
      status: validationStatuses,
    };
  };
}