Initial commit

sw.js

@@ -0,0 +1,30 @@
+const cacheName = 'v1'
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches
+      .open(cacheName)
+      .then(cache => cache.addAll([
+        '.',
+        './index.html',
+        './index.js',
+        './index.css',
+        './instances.json'
+      ]))
+  )
+})
+
+self.addEventListener('activate', (_event) => {
+})
+
+self.addEventListener('fetch', async (event) => {
+  const res = await fetch(event.request)
+  if (!res.ok) {
+    const cachedRes = await caches.match(event.request)
+    if (cachedRes) {
+      event.respondWith(cachedRes)
+      return
+    }
+  }
+  event.respondWith(res)
+})