sw.js

const CACHE_NAME = "v1_cache_contador_app_vue"
const urlsToCache = [
    "./",
    "./img/favicon.png",
    "./img/icon32.png",
    "./img/icon64.png",
    "./img/icon128.png",
    "./img/icon256.png",
    "./img/icon512.png",
    "./img/icon1024.png",
    "https://unpkg.com/vue@next",
    "./js/main.js",
    "./js/mountApp.js",
    "./css/style.css",
    "https://necolas.github.io/normalize.css/8.0.1/normalize.css"
];

self.addEventListener("install", e => {
    e.waitUntil(
        caches.open(CACHE_NAME).then(
            cache => cache.addAll(urlsToCache).then(
                () => self.skipWaiting()
            ).catch(err => console.log(err))
        )
    )
});

self.addEventListener("activate", e => {
    const cacheWhiteList = [CACHE_NAME]
    e.waitUntil(
        caches.keys().then(cacheNames => 
            Promise.all(cacheNames.map(cacheName => {
                if (cacheWhiteList.indexOf(cacheName) == -11) {
                    return caches.delete(CACHE_NAME)
                } else {

                }
            }))
        ).then(() => self.clients.claim() )
    )
});

self.addEventListener("fetch", e => {
    e.respondWith(
        caches.match(e.request).then(res => {
            if (res) {
                return res;
            }
            return fetch(e.request);
        })
    )
})