Inject parameter in Service Worker

Question

I'm trying to use the Service Worker but a the moment of registration I get this error:

I got that the service worker can't subscribe because the evaluation of the script failed, but I don't get why "Username" is not defined, cause if I debug it I can see the value inside it, and inside the service worker the value is passed correctly, but I can't figure out why "Username" is not defined. Help please!

This is the start and the end of the Sevice Worker:

This is the Service Worker:

Answer 1

You can inject parameter in url during registration

navigator.serviceWorker.register("my-service-worker.js?someParam=someValue")

and inside my-service-worker.js you can read it as follows

var param = null;

self.addEventListener('install', function (event) {
    param = new URL(location).searchParams.get('someParam');
});

you can add more params using & separator