handleValue method

@override dynamic handleValue(String? key, dynamic value)

Implementation

@override
dynamic handleValue(String? key, dynamic value) {
  final T? val = _findFirstValue(value);
  if (isNull(val)) {
    final Iterable<String> valids = _validArgs();
    throw ArgumentError('$key must be one of $valids');
  }
  return val;
}