intro-to-flutter-08.dart

@JsonSerializable()
class MessageDto {
  MessageDto({this.id, this.createdUtc, this.text, this.creator});

  final String id;
  final String createdUtc;
  final String text;
  final MessageAuthorDto creator;

  static MessageDto fromJson(Map<String, dynamic> json) =>
      _$MessageDtoFromJson(json);

  Map<String, dynamic> toJson() => _$MessageDtoToJson(this);
}