toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (index != null) 'index': index!,
if (nestingLevel != null) 'nestingLevel': nestingLevel!,
if (parentTabId != null) 'parentTabId': parentTabId!,
if (tabId != null) 'tabId': tabId!,
if (title != null) 'title': title!,
};