toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (changedText != null) 'changedText': changedText!,
if (provenance != null)
'provenance': provenance!.map((value) => value.toJson()).toList(),
if (textAnchor != null) 'textAnchor': textAnchor!.toJson(),
};