sw.js

const cacheName = 'intranet'

// Cache all the files to make a PWA
self.addEventListener('install', e => {
  e.waitUntil(
    caches.open(cacheName).then(cache => {
      // Our application only has two files here index.html and manifest.json
      // but you can add more such as style.css as your app grows
      return cache.addAll([
        './index.php',
        './manifest.json',
      ])
    }),
  )
})

// Our service worker will intercept all fetch requests
// and check if we have cached the file
// if so it will serve the cached file
self.addEventListener('fetch', function (event) {
  event.respondWith(
    fetch(event.request).then(function (networkResponse) {
      return networkResponse
    }),
  )
})