init

public/sw.js

@@ -0,0 +1,76 @@
+const CACHE_NAME = 'quartiles-pwa-v1';
+
+const STATIC_ASSETS = [
+  '/',
+  '/index.html',
+  '/manifest.webmanifest',
+  '/icon.svg'
+];
+
+// Install: Cache initial shell assets
+self.addEventListener('install', event => {
+  event.waitUntil(
+    caches.open(CACHE_NAME).then(cache => {
+      return cache.addAll(STATIC_ASSETS);
+    }).then(() => self.skipWaiting())
+  );
+});
+
+// Activate: Clean up old cache versions
+self.addEventListener('activate', event => {
+  event.waitUntil(
+    caches.keys().then(keys => {
+      return Promise.all(
+        keys.map(key => {
+          if (key !== CACHE_NAME) {
+            return caches.delete(key);
+          }
+        })
+      );
+    }).then(() => self.clients.claim())
+  );
+});
+
+// Fetch: Stale-While-Revalidate for local assets, Network-First for HTML navigation
+self.addEventListener('fetch', event => {
+  const request = event.request;
+  const url = new URL(request.url);
+
+  // Only handle GET requests
+  if (request.method !== 'GET') return;
+
+  // Handle HTML navigation requests (Offline support)
+  if (request.mode === 'navigate') {
+    event.respondWith(
+      fetch(request)
+        .then(response => {
+          if (response && response.status === 200) {
+            const responseClone = response.clone();
+            caches.open(CACHE_NAME).then(cache => cache.put(request, responseClone));
+          }
+          return response;
+        })
+        .catch(() => caches.match('/index.html') || caches.match('/'))
+    );
+    return;
+  }
+
+  // Same-origin static assets or Google Fonts: Stale-While-Revalidate
+  if (url.origin === location.origin || url.hostname.includes('googleapis.com') || url.hostname.includes('gstatic.com')) {
+    event.respondWith(
+      caches.match(request).then(cachedResponse => {
+        const fetchPromise = fetch(request)
+          .then(networkResponse => {
+            if (networkResponse && networkResponse.status === 200) {
+              const responseClone = networkResponse.clone();
+              caches.open(CACHE_NAME).then(cache => cache.put(request, responseClone));
+            }
+            return networkResponse;
+          })
+          .catch(() => cachedResponse);
+
+        return cachedResponse || fetchPromise;
+      })
+    );
+  }
+});