toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (epubCfiPosition != null) 'epubCfiPosition': epubCfiPosition!,
if (gbImagePosition != null) 'gbImagePosition': gbImagePosition!,
if (gbTextPosition != null) 'gbTextPosition': gbTextPosition!,
if (kind != null) 'kind': kind!,
if (pdfPosition != null) 'pdfPosition': pdfPosition!,
if (updated != null) 'updated': updated!,
if (volumeId != null) 'volumeId': volumeId!,
};