window.swRegistrationReady = (async () => {
    const checkPermission = async () => {
        if(!('serviceWorker' in navigator)) {
            throw new Error('Service Worker not supported');
        }
        if(!('PushManager' in window)) {
            throw new Error('Push API not supported');
        }
        if(!('Notification' in window)) {
            throw new Error('Notification API not supported');
        }
    }

    const registerSw = async () => {
        const swRegistration = await navigator.serviceWorker.register('/notification-serviceworker.js');
        return swRegistration;
    }

    try {
        await checkPermission();
        const registration = await registerSw();
        console.log('Service Worker registered');
        window.swRegistration = registration;
        return registration;
    } catch (err) {
        console.error(err);
        throw err;
    }
})();