toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (error != null) 'error': error!,
if (previousVersion != null) 'previousVersion': previousVersion!,
if (startTime != null) 'startTime': startTime!,
if (state != null) 'state': state!,
if (version != null) 'version': version!,
};