serviceworker.js
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serviceworker.js
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	var staticCacheName = "kolab-v1";
	var filesToCache = [
	'/offline',
	// '/css/app.css',
	// '/js/app.js',
	'/images/icons/icon-72x72.png',
	'/images/icons/icon-96x96.png',
	'/images/icons/icon-128x128.png',
	'/images/icons/icon-144x144.png',
	'/images/icons/icon-152x152.png',
	'/images/icons/icon-192x192.png',
	'/images/icons/icon-384x384.png',
	'/images/icons/icon-512x512.png',
	'/images/logo.svg',
	];

	// Cache on install
	self.addEventListener("install", event => {
	this.skipWaiting();
	event.waitUntil(
	caches.open(staticCacheName)
	.then(cache => {
	return cache.addAll(filesToCache);
	})
	)
	});

	// Clear cache on activate
	self.addEventListener('activate', event => {
	event.waitUntil(
	caches.keys().then(cacheNames => {
	return Promise.all(
	cacheNames
	.filter(cacheName => (cacheName.startsWith("kolab-")))
	.filter(cacheName => (cacheName !== staticCacheName))
	.map(cacheName => caches.delete(cacheName))
	);
	})
	);
	});

	// Serve from Cache
	self.addEventListener("fetch", event => {
	event.respondWith(
	caches.match(event.request)
	.then(response => {
	return response \|\| fetch(event.request);
	})
	.catch(() => {
	return caches.match('offline');
	})
	)
	});