toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (items != null)
'items': items!.map((value) => value.toJson()).toList(),
if (kind != null) 'kind': kind!,
if (nextPageToken != null) 'nextPageToken': nextPageToken!,
if (warnings != null)
'warnings': warnings!.map((value) => value.toJson()).toList(),
};