App.js setup for firebase notifications

App.js

//...
async getToken() {
    let fcmToken = await AsyncStorage.getItem('fcmToken');
    if (!fcmToken) {
        fcmToken = await firebase.messaging().getToken();
        if (fcmToken) {
            await AsyncStorage.setItem('fcmToken', fcmToken);
        }
    }
}

async checkPermission() {
    const enabled = await firebase.messaging().hasPermission();
    if (enabled) {
        this.getToken();
    } else {
        this.requestPermission();
    }
}

async requestPermission() {
    try {
        await firebase.messaging().requestPermission();
        this.getToken();
    } catch (error) {
        console.log('permission rejected');
    }
}

async createNotificationListeners() {
    firebase.notifications().onNotification(notification => {
        notification.android.setChannelId('insider').setSound('default')
        firebase.notifications().displayNotification(notification)
    });
}

componentDidMount() {
    const channel = new firebase.notifications.Android.Channel('insider', 'insider channel', firebase.notifications.Android.Importance.Max)
    firebase.notifications().android.createChannel(channel);
    this.checkPermission();
    this.createNotificationListeners();
}

//...