make pwa for offline usage

angular.json

@@ -56,7 +56,8 @@
                   "maximumError": "8kB"
                 }
               ],
-              "outputHashing": "all"
+              "outputHashing": "all",
+              "serviceWorker": "ngsw-config.json"
             },
             "development": {
               "optimization": false,

ngsw-config.json

@@ -0,0 +1,30 @@
+{
+  "$schema": "./node_modules/@angular/service-worker/config/schema.json",
+  "index": "/index.html",
+  "assetGroups": [
+    {
+      "name": "app",
+      "installMode": "prefetch",
+      "resources": {
+        "files": [
+          "/favicon.ico",
+          "/index.csr.html",
+          "/index.html",
+          "/manifest.webmanifest",
+          "/*.css",
+          "/*.js"
+        ]
+      }
+    },
+    {
+      "name": "assets",
+      "installMode": "lazy",
+      "updateMode": "prefetch",
+      "resources": {
+        "files": [
+          "/**/*.(svg|cur|jpg|jpeg|png|apng|webp|avif|gif|otf|ttf|woff|woff2)"
+        ]
+      }
+    }
+  ]
+}

package-lock.json

@@ -19,6 +19,7 @@
         "@angular/platform-browser-dynamic": "^19.0.0",
         "@angular/platform-server": "^19.0.0",
         "@angular/router": "^19.0.0",
+        "@angular/service-worker": "^19.0.0",
         "@angular/ssr": "^19.0.2",
         "express": "^4.18.2",
         "rxjs": "~7.8.0",
@@ -602,6 +603,25 @@
         "rxjs": "^6.5.3 || ^7.4.0"
       }
     },
+    "node_modules/@angular/service-worker": {
+      "version": "19.0.1",
+      "resolved": "https://registry.npmjs.org/@angular/service-worker/-/service-worker-19.0.1.tgz",
+      "integrity": "sha512-A4sXkytnG8XYYochzBsXgQgfBUWgHbQEJkmzQ+E00hbymmgzI5y2BCW56HeI8riiIUAfrgXhfzZobdI+/h72jg==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.3.0"
+      },
+      "bin": {
+        "ngsw-config": "ngsw-config.js"
+      },
+      "engines": {
+        "node": "^18.19.1 || ^20.11.1 || >=22.0.0"
+      },
+      "peerDependencies": {
+        "@angular/common": "19.0.1",
+        "@angular/core": "19.0.1"
+      }
+    },
     "node_modules/@angular/ssr": {
       "version": "19.0.2",
       "resolved": "https://registry.npmjs.org/@angular/ssr/-/ssr-19.0.2.tgz",

package.json

@@ -22,6 +22,7 @@
     "@angular/platform-browser-dynamic": "^19.0.0",
     "@angular/platform-server": "^19.0.0",
     "@angular/router": "^19.0.0",
+    "@angular/service-worker": "^19.0.0",
     "@angular/ssr": "^19.0.2",
     "express": "^4.18.2",
     "rxjs": "~7.8.0",

public/manifest.webmanifest

@@ -0,0 +1,59 @@
+{
+  "name": "vb",
+  "short_name": "vb",
+  "theme_color": "#1976d2",
+  "background_color": "#fafafa",
+  "display": "standalone",
+  "scope": "./",
+  "start_url": "./",
+  "icons": [
+    {
+      "src": "icons/icon-72x72.png",
+      "sizes": "72x72",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-96x96.png",
+      "sizes": "96x96",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-128x128.png",
+      "sizes": "128x128",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-144x144.png",
+      "sizes": "144x144",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-152x152.png",
+      "sizes": "152x152",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-384x384.png",
+      "sizes": "384x384",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "src": "icons/icon-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable any"
+    }
+  ]
+}

src/app/app.config.ts

@@ -1,10 +1,14 @@
-import { ApplicationConfig, provideZoneChangeDetection } from '@angular/core';
+import { ApplicationConfig, provideZoneChangeDetection, isDevMode } from '@angular/core';
 import { provideRouter } from '@angular/router';
 
 import { routes } from './app.routes';
 import { provideClientHydration, withEventReplay } from '@angular/platform-browser';
 import { provideAnimationsAsync } from '@angular/platform-browser/animations/async';
+import { provideServiceWorker } from '@angular/service-worker';
 
 export const appConfig: ApplicationConfig = {
-  providers: [provideZoneChangeDetection({ eventCoalescing: true }), provideRouter(routes), provideClientHydration(withEventReplay()), provideAnimationsAsync('noop')]
+  providers: [provideZoneChangeDetection({ eventCoalescing: true }), provideRouter(routes), provideClientHydration(withEventReplay()), provideAnimationsAsync('noop'), provideServiceWorker('ngsw-worker.js', {
+            enabled: !isDevMode(),
+            registrationStrategy: 'registerWhenStable:30000'
+          })]
 };

src/index.html

@@ -6,10 +6,13 @@
   <base href="/">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <link rel="icon" type="image/x-icon" href="favicon.ico">
-  <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500&display=swap" rel="stylesheet">
+  <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500&amp;display=swap" rel="stylesheet">
   <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
+  <link rel="manifest" href="manifest.webmanifest">
+  <meta name="theme-color" content="#1976d2">
 </head>
 <body>
   <app-root></app-root>
+  <noscript>Please enable JavaScript to continue using this application.</noscript>
 </body>
 </html>