unsubscribe method Null safety

Future<void> unsubscribe(
  1. {List<UnsubscribeStreams>? streams}
)

Implementation

Future<void> unsubscribe({List<UnsubscribeStreams>? streams}) async {
  var payload = {
    "request": "unsubscribe",
    "streams": streams
        ?.map((e) => e.toMap()..removeWhere((key, value) => value == null))
        .toList()
  }..removeWhere((key, value) => value == null);
  await this.send(data: payload);
}