How to use the @ionic-native/code-push.SyncStatus.DOWNLOADING_PACKAGE function in @ionic-native/code-push

this.messageText = '应用程式是最新的！';
                });
            }

            // not facing zoning issue here ?

            switch (syncStatus) {
                case SyncStatus.IN_PROGRESS:
                    this.messageText = '正在进行更新 ..';
                    break;

                case SyncStatus.CHECKING_FOR_UPDATE:
                    this.messageText = '检查更新 ..';
                    break;

                case SyncStatus.DOWNLOADING_PACKAGE:
                    this.messageText = '下载包 ..';
                    break;

                case SyncStatus.INSTALLING_UPDATE:
                    this.messageText = '安装更新 ..';
                    break;

                case SyncStatus.UPDATE_INSTALLED:
                    this.messageText = '安装更新 ..';
                    const alert = this.alertCtrl.create({
                        title: '更新',
                        message: '安装了一个新的更新，并将在下次重新启动应用程序时可用',
                        buttons: ['好']
                    });
                    alert.present();
                    alert.onDidDismiss(() => {