How to use the ionic-native.StatusBar.styleDefault function in ionic-native

platform.ready().then(function () {
            // Here you can do any higher level native things you might need.
            StatusBar.styleDefault();
            Splashscreen.hide();
            _this.configServ.setMusicPlayed(false);
            // Listen for pause event (emits when the native platform puts the application into the background)
            platform.pause.subscribe(function () {
                _this.configServ.setPauseEmitted('Y');
                if (_this.configServ.getUserPin().length >= 4) {
                    _this.nav.setRoot(HomePage);
                }
            });
        }, function (error) {
            console.log(error);

platform.ready().then(() => {
      // Okay, so the platform is ready and our plugins are available.
      // Here you can do any higher level native things you might need.
      StatusBar.styleDefault();
    });
  }

platform.ready().then(() => {
      // Okay, so the platform is ready and our plugins are available.
      // Here you can do any higher level native things you might need.
      StatusBar.styleDefault();
      Splashscreen.hide();

      if(this.auth.isAuthenticated()) {
        this.db.connect();
        this.rootPage = HomePage;
      } else {
        this.rootPage = LoginPage;
      }
      
    });
  }

platform.ready().then(() => {
      // Okay, so the platform is ready and our plugins are available.
      // Here you can do any higher level native things you might need.
      StatusBar.styleDefault();
    });
  }

platform.ready().then(() => {
      // Okay, so the platform is ready and our plugins are available.
      // Here you can do any higher level native things you might need.
      StatusBar.styleDefault();
    });
  }

private onReady(): void {
        // Okay, so the platform is ready and our plugins are available.
        // Here you can do any higher level native things you might need.
        StatusBar.styleDefault();
        Splashscreen.hide();
    }

platform.ready().then(function () {
            // Okay, so the platform is ready and our plugins are available.
            // Here you can do any higher level native things you might need.
            StatusBar.styleDefault();
            Splashscreen.hide();
        });
    }

platform.ready().then(() => {
      // Okay, so the platform is ready and our plugins are available.
      // Here you can do any higher level native things you might need.
      StatusBar.styleDefault();
      Splashscreen.hide();

      this.initPushNotification();
    });
  }

platform.ready().then(() => {
      StatusBar.styleDefault();
      Splashscreen.hide();
      menuCtrl.enable(true);
      this.handleRoot();
      this.handleNetworkChanges();
    });
    this.queueService.setupQueueListener();

platform.ready().then(() => {
      StatusBar.styleDefault();
    });
  }