string method

FieldValidator<String?, String?> string([
  1. String? validate(
    1. String? value
    )?
])

create FieldValidator for String

Implementation

FieldValidator<String?, String?> string(
    [String? Function(String? value)? validate]) {
  return FieldValidator<String?, String?>._(
    messages: _messages,
    convert: (v) => v,
    validate: (value) => validate?.call(value.value),
  );
}