const VERSION = '0.0.0';

self.addEventListener('install', event => {
    event.waitUntil(
        caches.open('v1').then(cache => {
            return fetch('.?v=' + VERSION).then(response => {
                if (response.ok) {
                    cache.put('.', response);
                }
            });
        })
    );
});

self.addEventListener('fetch', event => {
    event.respondWith(
        caches.match(event.request.url).then(response => response || fetch(event.request))
    );
});