userUniqAppend method
The element appended to the library needs to be done to remove the processing,and then import.
Implementation
void userUniqAppend(Map<String, List> properties) {
properties.updateAll((String k, List v) {
return v.map((e) => e is DateTime ? _formatDateString(e) : e).toList();
});
_channel.invokeMethod<void>('userUniqAppend',
<String, dynamic>{'properties': properties, 'appId': this._appId});
}