creditCard method

FieldValidator<String?, String?> creditCard([
  1. MessageCallBack<String>? message
])

check if the value is email address

Implementation

FieldValidator<String?, String?> creditCard(
    [MessageCallBack<String>? message]) {
  return next(
    (messages, value) => value != null && !Utils.isCreditCard(value)
        ? message?.call(messages, value) ?? messages.isCreditCard
        : null,
  );
}