dispose method

Implementation

@override
void dispose() {
  unawaited(_leaveSubscription?.cancel());
  _leaveSubscription = null;
  super.dispose();
  if (plugin is LuauPlugin) {
    (plugin as LuauPlugin).dispose();
  }
  if (plugin is RustOpaqueInterface) {
    (plugin as RustOpaqueInterface).dispose();
  }
}