Send iOS 12 grouped remote notifications with node-apn

app.js

// References:
// https://developer.apple.com/videos/play/wwdc2018/711/
// https://github.com/node-apn/node-apn/blob/master/doc/notification.markdown#convenience-setters
// https://eladnava.com/send-push-notifications-to-ios-devices-using-xcode-8-and-swift-3/

var apn = require('apn');

// Set up apn with the APNs Auth Key
var apnProvider = new apn.Provider({  
     token: {
        key: 'xxxxx.p8', // Path to the key p8 file
        keyId: 'yyyyy', // The Key ID of the p8 file (available at https://developer.apple.com/account/ios/certificate/key)
        teamId: 'zzzzz', // The Team ID of your Apple Developer Account (available at https://developer.apple.com/account/#/membership/)
    },
    production: false // Set to true if sending a notification to a production iOS app
});

// Enter the device token from the Xcode console
var deviceToken = 'aaaaa';

// Prepare a new notification
var notification = new apn.Notification();

// Specify your iOS app's Bundle ID (accessible within the project editor)
notification.topic = 'com.example.app';

// Set expiration to 1 hour from now (in case device is offline)
notification.expiry = Math.floor(Date.now() / 1000) + 3600;

// Display the following message
notification.alert = {"body" : "Remote notification with threadId and summary", "summary-arg" : "thread-id-1"};
notification.threadId = "thread-id-1";
notification.category = "category-id-1";

// Actually send the notification
apnProvider.send(notification, deviceToken).then(function(result) {  
    // Check the result for any failed devices
    console.log(result);
});