self.addEventListener('activate', function(event) {
	event.waitUntil(clients.claim());
});

self.addEventListener('install', function() {
	self.skipWaiting();
});

self.addEventListener('fetch', function(event) {
    event.respondWith(
		caches.match(event.request).then(function(res) {
			return res || fetch(event.request);
		})
	);
});