Is firebase_messaging supported in plain Dart (not Flutter) code?

[andynewman10]

If I understand correctly, on the web, Firebase messaging requires developers to write a firebase-messaging-sw.js file in the web folder. This implementation seems to be required to receive any FCM message, including messages with a notification payload.

This file currently needs to be written in plain Javascript code, which is not ideal, eg.:

https://firebase.google.com/docs/cloud-messaging/js/receive#web_1

As stated here, there used to be a firebase package (https://pub.dev/packages/firebase) that was supported by plain Dart code:

For browser-based applications: package:firebase/firebase.dart and package:firebase/firestore.dart are wrappers over the Firebase JS API.
For the Dart VM and Fuchsia: package:firebase/firebase_io.dart is a lightly maintained wrapper over the Firebase Database REST API. Contributions to expand support to the other REST APIs are appreciated!

This package is now deprecated and developers have long asked to migrate to firebase_core.

Is it possible to write a web service worker in Dart and use Firebase packages?