onMemberUpdate property Null safety

Stream<List<NIMSuperTeamMember>> onMemberUpdate

Listen to the changes of the member profiles. Once the event occurs, a notification will be sent to group members about the changes. If the application layer manages the cache of the group member profiles, the current user can call the API to update the cache. observer: The Observer interface, whose parameter is the list of the updated member profiles. register true: register the Observer interface, false: unregister


Stream<List<NIMSuperTeamMember>> get onMemberUpdate =>