toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (databaseId != null) 'databaseId': databaseId!,
if (keys != null) 'keys': keys!,
if (propertyMask != null) 'propertyMask': propertyMask!,
if (readOptions != null) 'readOptions': readOptions!,
};