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self.addEventListener('install', e => e.waitUntil(skipWaiting()));
self.addEventListener('activate', e => e.waitUntil(clients.claim()));
self.addEventListener('message', async e => {
const method = e.data;
const promise = method === 'subscribe' ?
self.registration.pushManager.subscribe({userVisibleOnly: true}) :
Promise.resolve();
const message = await promise
.then(() => {
return `${method}: Unexpectedly started`;
})
.catch((e) => {
return e.message;
});
e.source.postMessage(message);
});