woz 1.1.1

Woz is a WebAssembly progressive web app (PWA) toolchain for deploying performant mobile apps distributed for free with a hyperlink. 
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// TODO this should be a unique key based on version
var cacheName = 'pwa-test';
var appShellFiles = [
  '/index.html',
];

// On install, download files to the cache
self.addEventListener('install', function(e) {
  console.log('[Service Worker] Install');
  e.waitUntil(
    caches.open(cacheName).then(function(cache) {
      console.log('[Service Worker] Caching all: app shell and content');
      return cache.addAll(appShellFiles);
    })
  );
});

// Offline uses cache
self.addEventListener('fetch', function(e) {
  e.respondWith(
    caches.match(e.request).then(function(r) {
      console.log('[Service Worker] Fetching resource: '+e.request.url);
      return r || fetch(e.request).then(function(response) {
        return caches.open(cacheName).then(function(cache) {
          console.log('[Service Worker] Caching new resource: '+e.request.url);
          cache.put(e.request, response.clone());
          return response;
        });
      });
    })
  );
});

// Clear out existing cache
self.addEventListener('activate', function(e) {
  e.waitUntil(
    caches.keys().then(function(keyList) {
      return Promise.all(keyList.map(function(key) {
        if(cacheName.indexOf(key) === -1) {
          return caches.delete(key);
        }
      }));
    })
  );
});