toJson method
Implementation
Map<String, Object?> toJson() => {
'id': id,
'label': label,
if (description != null) 'description': description,
if (feeds.isNotEmpty) 'feeds': [for (var f in feeds) f.toJson()],
if (states.isNotEmpty) 'states': [for (var s in states) s.toJson()],
if (knobs.isNotEmpty) 'knobs': [for (var k in knobs) k.toJson()],
if (actions.isNotEmpty) 'actions': [for (var a in actions) a.toJson()],
};