1. @override
Future onInvoke(Map<String, dynamic> params)

This is called when this node is invoked. You can return the following types from this method:

  • Iterable
  • Map
  • Table
  • Stream
  • SimpleTableResult
  • AsyncTableResult

You can also return a future that resolves to one (like if the method is async) of the following types:

  • Stream
  • Iterable
  • Map
  • Table

Source 

@override
onInvoke(Map<String, dynamic> params) async {
  String name = params["Icon"];
  IconResolver resolver = provider._iconResolver;

  ByteData data = await resolver(name);

  return [[
    data
  ]];
}