toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (listAssetsResults != null) 'listAssetsResults': listAssetsResults!,
if (nextPageToken != null) 'nextPageToken': nextPageToken!,
if (readTime != null) 'readTime': readTime!,
if (totalSize != null) 'totalSize': totalSize!,
};