getLastSeen method
Get timestamp of last seen using getLastSeen return either a timestamp or 0 if last seen off
Implementation
Future<int?> getLastSeen({required String phone}) async {
var lastSeen = await wpClient.evaluateJs(
'''window.WPP.chat.getLastSeen(${phone.phoneParse});''',
methodName: "GetLastSeen");
if (lastSeen.runtimeType == bool) return lastSeen ? 1 : 0;
if (lastSeen.runtimeType == int) return lastSeen;
return null;
}