FlutterWindowClosePluginWeb constructor

Implementation

FlutterWindowClosePluginWeb() {
  window.addEventListener(
    'beforeunload',
    (JSAny event) {
      if (event.isA<BeforeUnloadEvent>()) {
        final unloadEvent = event as BeforeUnloadEvent;
        unloadEvent.preventDefault();
        if (_returnValue != null) {
          unloadEvent.returnValue = _returnValue!;
        }
      }
    }.toJS,
  );
}