Jekyll service worker

---
layout: null
---
var currentCache = 'cache name';
var coreCache = [
  {%- for post in site.posts -%}
    "{{ post.url }}",
  {%- endfor -%}
  {%- for page in site.html_pages -%}
    "{{ page.url }}",
  {%- endfor -%}
  "/scripts.js"
];
var secondaryCache = [
  {%- for asset in site.static_files -%}
    {%- if asset.path contains '.woff2' -%}
      "{{ asset.path }}",
    {%- endif -%}
  {%- endfor -%}
  "/styles.css"
];
self.addEventListener('install', function(event) {
  event.waitUntil(async function() {
  const cache = await caches.open(currentCache);
  cache.addAll(secondaryCache); // caches fonts in the background, without install being "dependant" on them
  await cache.addAll(coreCache); // more important stuff
  });
});
// If a request doesn't match anything in the cache, fallback to network and then add to cache!
self.addEventListener('fetch', function(event) {
  event.respondWith(async function() {
    const cache = await caches.open(currentCache);
    const cachedResponse = await cache.match(event.request);
    if (cachedResponse) return cachedResponse;
    const networkResponse = await fetch(event.request);
    event.waitUntil(
      cache.put(event.request, networkResponse.clone())
    );
    return networkResponse;
  });
});
// update service worker if there is a new one
self.addEventListener('activate', function(event) {
  var cacheWhitelist = [currentCache];
  event.waitUntil(
    caches.keys().then(function(cacheNames) {
      return Promise.all(
        cacheNames.map(function(cacheName) {
          if (cacheWhitelist.indexOf(cacheName) === -1) {
            return caches.delete(cacheName);
          }
        })
      );
    })
  );
});