invoke method
Implementation
@override
Future<List<vf.Card>?> invoke(BuildContext context) async {
final response = await vyuh.network.get(Uri.parse(url));
final json = jsonDecode(response.body);
final rootItem = JsonPath(rootField.path).read(json);
if (rootItem.singleOrNull == null) return null;
final root = rootItem.single.value;
return switch (root) {
List() => root.map((e) => _createCard(e)).toList(),
Map() => [_createCard(root as Map<String, dynamic>)],
_ => null
};
}