Initial curated chimera source from a8ae5b1db07fb49926c94585e2718e5130330974

renderer/service-worker.js

@@ -0,0 +1,39 @@
+'use strict';
+
+const CACHE = 'chimera-shell-v1';
+const SHELL = ['/offline.html', '/manifest.webmanifest', '/build/icon.png'];
+
+self.addEventListener('install', event => {
+  event.waitUntil(caches.open(CACHE).then(cache => cache.addAll(SHELL)).then(() => self.skipWaiting()));
+});
+
+self.addEventListener('activate', event => {
+  event.waitUntil(caches.keys().then(keys => Promise.all(keys.filter(key => key.startsWith('chimera-shell-') && key !== CACHE).map(key => caches.delete(key)))).then(() => self.clients.claim()));
+});
+
+function cacheable(url) {
+  return url.origin === self.location.origin && (url.pathname === '/manifest.webmanifest' || url.pathname === '/offline.html' || url.pathname === '/build/icon.png' || url.pathname.startsWith('/styles/') || url.pathname.startsWith('/modules/'));
+}
+
+self.addEventListener('fetch', event => {
+  if (event.request.method !== 'GET') return;
+  const url = new URL(event.request.url);
+  if (event.request.mode === 'navigate') {
+    event.respondWith(fetch(event.request).catch(() => caches.match('/offline.html')));
+    return;
+  }
+  if (!cacheable(url)) return;
+  const isIcon = url.pathname === '/build/icon.png';
+  const cacheFallback = isIcon ? '/build/icon.png' : event.request;
+  event.respondWith(
+    fetch(event.request).then(response => {
+      if (response.ok && response.type === 'basic') {
+        caches.open(CACHE).then(cache => {
+          cache.put(event.request, response.clone());
+          if (isIcon) cache.put(cacheFallback, response.clone());
+        });
+      }
+      return response;
+    }).catch(() => caches.match(cacheFallback)),
+  );
+});