service-worker.js

const versionNumber = 3.3;

self.addEventListener('install', e => {
    try {
        e.waitUntil(
            caches.open('static').then(cache => {
                return cache.addAll([
                    './',
                    './portfolio/images/sequoiatree.png',
                    './portfolio/images/EyeTerraEdit.png',
                    './skllc.css'
                ]);
            })
        )
        console.log("sw.js - SW registered successfully!");
    } catch (error) {
        console.log("SW registration failed. " + error);
    }
});

// these logs will only print if a change is made to this file, and must be inspected in the browser. Go to application, then service workers, then click on stopwaiting, 

self.addEventListener('fetch', e => {
    e.respondWith(
        caches.match(e.request).then(response => {
            // if it is in the cache, fetch the request. else fetch it from the network 
            return response || fetch(e.request);
        })
    )
})