OnRevokeAdministratorCallback typedef
        OnRevokeAdministratorCallback =
     void Function(String groupID, V2TimGroupMemberInfo opUser, List<V2TimGroupMemberInfo>  memberList)
    
    
    
Implementation
typedef OnRevokeAdministratorCallback = void Function(
  String groupID,
  V2TimGroupMemberInfo opUser,
  List<V2TimGroupMemberInfo> memberList,
);