mchess-client/lib/api/register.dart

class CreateGameResponse {
  final String? passphrase;

  const CreateGameResponse({
    required this.passphrase,
  });

  factory CreateGameResponse.empty() {
    return const CreateGameResponse(passphrase: null);
  }

  factory CreateGameResponse.fromJson(Map<String, dynamic> json) {
    final passphrase = json['passphrase'];

    return CreateGameResponse(passphrase: passphrase);
  }

  Map<String, dynamic> toJson() {
    return {
      'passphrase': passphrase,
    };
  }
}