sw-10.js

function registerPush(appPubkey) {
    if (navigator.serviceWorker) {
        navigator.serviceWorker.register('sw.js')
            .then(function(reg) {
                return reg.pushManager.getSubscription().then(function(subscription) {
                    if (subscription) {
                        return subscription;
                    }

                    return registration.pushManager.subscribe({
                        userVisibleOnly: true, applicationServerKey: appPubkey
                    });
                });
            })
    }
}

Line 10, registration is meant to be reg right?