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