Add push notification tutorial (blog.vverh.digital)

config_1.xml

  <platform name="android">
    <preference name="AndroidXEnabled" value="true" />
  </platform>

config_2.xml

  <platform name="android">
    <preference name="AndroidXEnabled" value="true" />
    <resource-file src="res/google-services.json" target="app/google-services.json" />
  </platform>

config_3.xml

 <resource-file src="res/drawable/drawable-anydpi-v24/notification_icons.xml" target="app/src/main/res/drawable-anydpi-v24/notification_icons.xml" />
 <resource-file src="res/drawable/drawable-hdpi/notification_icons.png" target="app/src/main/res/drawable-hdpi/notification_icons.png" />
 <resource-file src="res/drawable/drawable-mdpi/notification_icons.png" target="app/src/main/res/drawable-mdpi/notification_icons.png" />
 <resource-file src="res/drawable/drawable-xhdpi/notification_icons.png" target="app/src/main/res/drawable-xhdpi/notification_icons.png" />
 <resource-file src="res/drawable/drawable-xxhdpi/notification_icons.png" target="app/src/main/res/drawable-xxhdpi/notification_icons.png" />
 <config-file target="AndroidManifest.xml" parent="/manifest/application"> 
   <meta-data android:name="com.google.firebase.messaging.default_notification_icon" android:resource="@drawable/notification_icons" />
 </config-file>
<!-- And finally, add this dependency in tag <widget>: -->
<widget ... xmlns:android="schemas.android.com/apk/res/android" ...></widget>

index.js

window.pushNotification.registration(
  (token) => {
    console.log(token);
  },
  (error) => {
    console.error(error);
  }
);