class MigrateUserModelToHaveMultipleJourneys implements Migration {
  String get id => "migrate_user_model_to_have_multiple_journeys";

  @override
  Future<MigrationResult> run() async {
    // change the data model of your underlying data structure
    return MigrationResult.successful;
  }
}

class MigrateTokensToNativeSecureStorage implements Migration {
  String get id => "migrate_tokens_to_native_secure_storage";

  @override
  Future<MigrationResult> run() async {
    // read the tokens from the previous storage, and move them to the secure storage
    return MigrationResult.successful;
  }
}

final journey = Journey(
  migrations: [
    MigrateUserModelToHaveMultipleJourneys(),
    MigrateTokensToNativeSecureStorage(),
  ],
);

// U can use the reports for analytical purposes
final reports = await journey.migrate();