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

if (syncStatus === SyncStatus.UP_TO_DATE) {

                // facing some zoning problems here !!
                // why ??

                // forcing to run in the ngzone
                this.ngZone.run(() => {
                    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: