feat: Add service worker for offline install

manifest.json

@@ -0,0 +1,15 @@
+{
+  "name": "Pascar Text Editor",
+  "short_name": "Pascar",
+  "start_url": "index.html",
+  "display": "standalone",
+  "background_color": "#1c1c1c",
+  "theme_color": "#295991",
+  "icons": [
+    {
+      "src": "icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    }
+  ]
+}

src/index.html

@@ -1324,6 +1324,15 @@
       e.returnValue = '';
     }
   });
+
+  // -- Service Worker to make this application work offline
+  if ('serviceWorker' in navigator) {
+    window.addEventListener('load', () => {
+      navigator.serviceWorker.register('sw.js')
+        .then(reg => console.log('Service Worker Registered'))
+        .catch(err => console.log('Registration Failed', err));
+    });
+  }
  
 })();
 </script>

sw.js

@@ -0,0 +1,21 @@
+const CACHE_NAME = 'pascar';
+const ASSETS = [
+  'index.html',
+  'manifest.json'
+];
+
+// Install: Cache the files
+self.addEventListener('install', (e) => {
+  e.waitUntil(
+    caches.open(CACHE_NAME).then((cache) => cache.addAll(ASSETS))
+  );
+});
+
+// Fetch: Serve from cache if offline
+self.addEventListener('fetch', (e) => {
+  e.respondWith(
+    caches.match(e.request).then((response) => {
+      return response || fetch(e.request);
+    })
+  );
+});