how to handle dynamic type map or array

[naumanahmed19]

I have a scenario where data could be a dynamic map with values or an empty array, is there any annotation method to check null or isEmpty.

class myModel{
  final Attr? attrs; 
}

right now json['attrs'].isEmpty this works but i lose changes when i run build runner again.

  attrs: json['attrs'] == null || json['attrs'].isEmpty
          ? null

[kevmoo]

What type is Attr?