Custom callbacks on subscription

[azmeuk]

This would be very convenient to execute custom code when users subscribe or unsubscribe to notifications.
I suggest implementing a callback mechanism, for instance by adding a callback parameter in to the subscribe and unsubscribe functions, and execute the callbacks in or instead of reg.pushManager.subscribe(options).then and subscription.unsubscribe().then for instance.
What do you think?

[iragm]

I worked around this by adding the following to my template's js:

    const targetNode = document.getElementById('webpush-subscribe-button');
    // Create a callback function that executes when mutations are observed
    const callback = function(mutationsList) {
        for (let mutation of mutationsList) {
            if (mutation.type === 'childList') {
                if (targetNode.textContent == "Subscribe to Push Messaging") {
                    // do something here
                   console.log('subscribed');
                } else {
                    // do something different here
                    console.log(targetNode.textContent);
                }
            }
        }
    };
    // Create an observer instance linked to the callback function
    const observer = new MutationObserver(callback);
    // Define the configuration for the observer
    const config = { childList: true, subtree: true };
    // Start observing the target node for configured mutations
    observer.observe(targetNode, config);

This does not take into account i18n, but it works in my app. It would be much cleaner to have this built in as you suggest, but it does not seem like this repo is very maintained.