toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (publishState != null) 'publishState': publishState!,
if (publishTime != null) 'publishTime': publishTime!,
if (publishedAs != null) 'publishedAs': publishedAs!,
if (publishedSource != null) 'publishedSource': publishedSource!,
};