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self.addEventListener('install', e => e.waitUntil(skipWaiting()));
self.addEventListener('activate', e => e.waitUntil(clients.claim()));
self.addEventListener('message', async event => {
const method = event.data;
const {index} = self.registration;
const id = 'fenced-frame-id-sw';
let promise;
if (method === 'add') {
promise = index.add({
id,
title: 'same title',
description: 'same description',
url: 'resources/'
});
} else if (method === 'delete') {
promise = index.delete(id);
} else if (method === 'getAll') {
promise = index.getAll();
} else {
promise = Promise.resolve();
}
const message = await promise.then(() => 'success').catch(e => e.message);
event.source.postMessage(message);
});