toJson method
Implementation
Map<String, dynamic> toJson() {
return {
'id': id,
'name': name,
if (presentationHint != null) 'presentationHint': presentationHint,
if (namedVariables != null) 'namedVariables': namedVariables,
if (indexedVariables != null) 'indexedVariables': indexedVariables,
};
}