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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;
let promise;
if (method === 'setAppBadge') {
promise = self.navigator.setAppBadge(1);
} else if (method === 'clearAppBadge') {
promise = self.navigator.clearAppBadge();
} else {
promise = Promise.resolve();
}
const error = await promise
.then(() => {
return `[Badging API ${method}] Unexpectedly started`;
})
.catch((e) => e);
e.source.postMessage(error);
});