toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (activity != null) 'activity': activity!,
if (dataset != null) 'dataset': dataset!,
if (endTimeMillis != null) 'endTimeMillis': endTimeMillis!,
if (session != null) 'session': session!,
if (startTimeMillis != null) 'startTimeMillis': startTimeMillis!,
if (type != null) 'type': type!,
};