build: add pwa capability

angular.json

@@ -57,7 +57,8 @@
                   "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

@@ -14,6 +14,7 @@
         "@angular/forms": "^21.0.0",
         "@angular/platform-browser": "^21.0.0",
         "@angular/router": "^21.0.0",
+        "@angular/service-worker": "^21.0.6",
         "angular-web-sqlite": "^1.0.34",
         "rxjs": "~7.8.0",
         "tslib": "^2.3.0"
@@ -602,6 +603,25 @@
         "rxjs": "^6.5.3 || ^7.4.0"
       }
     },
+    "node_modules/@angular/service-worker": {
+      "version": "21.0.6",
+      "resolved": "https://registry.npmjs.org/@angular/service-worker/-/service-worker-21.0.6.tgz",
+      "integrity": "sha512-/T1aHc7ys3in7qTGO8MLIHvoXumMPxv7vU1C1sKbK14mw8ahwuqYo8m2Y+f6/ZcYwUZIbN3Ipd9sHEEB7VCz3A==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.3.0"
+      },
+      "bin": {
+        "ngsw-config": "ngsw-config.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      },
+      "peerDependencies": {
+        "@angular/core": "21.0.6",
+        "rxjs": "^6.5.3 || ^7.4.0"
+      }
+    },
     "node_modules/@asamuzakjp/css-color": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-4.1.1.tgz",

package.json

@@ -29,6 +29,7 @@
     "@angular/forms": "^21.0.0",
     "@angular/platform-browser": "^21.0.0",
     "@angular/router": "^21.0.0",
+    "@angular/service-worker": "^21.0.6",
     "angular-web-sqlite": "^1.0.34",
     "rxjs": "~7.8.0",
     "tslib": "^2.3.0"

public/manifest.webmanifest

@@ -0,0 +1,64 @@
+{
+  "name": "Groceries price tracker",
+  "background_color": "#ffffff",
+  "short_name": "Price tracker",
+  "display": "standalone",
+  "scope": "./",
+  "start_url": "./",
+  "icons": [
+    {
+      "src": "icons/icon-48x48.png",
+      "sizes": "48x48",
+      "type": "image/png",
+      "purpose": "maskable any"
+    },
+    {
+      "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 +1,16 @@
-import { ApplicationConfig, inject, provideAppInitializer, provideBrowserGlobalErrorListeners } from '@angular/core';
+import {
+  ApplicationConfig,
+  inject,
+  provideAppInitializer,
+  provideBrowserGlobalErrorListeners,
+  isDevMode,
+} from '@angular/core';
 import { provideRouter } from '@angular/router';
 import { routes } from './app.routes';
 import { WebSqlite } from 'angular-web-sqlite';
 import { Sqlite } from './services/sqlite';
 import { tables } from '../migrations/20260117';
-
+import { provideServiceWorker } from '@angular/service-worker';
 
 export const appConfig: ApplicationConfig = {
   providers: [
@@ -15,8 +21,12 @@ export const appConfig: ApplicationConfig = {
       await sqlite.executeQuery('PRAGMA foreign_keys = ON;');
       document.dispatchEvent(new CustomEvent('ng-boot'));
     }),
-    {provide: WebSqlite, useClass: WebSqlite},
+    { provide: WebSqlite, useClass: WebSqlite },
     provideBrowserGlobalErrorListeners(),
-    provideRouter(routes)
-  ]
+    provideRouter(routes),
+    provideServiceWorker('ngsw-worker.js', {
+      enabled: !isDevMode(),
+      registrationStrategy: 'registerWhenStable:30000',
+    }),
+  ],
 };

src/index.html

@@ -6,6 +6,7 @@
   <base href="/">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <link rel="icon" type="image/x-icon" href="favicon.ico">
+  <link rel="manifest" href="manifest.webmanifest">
 </head>
 <body>
   <scan-loading-screen></scan-loading-screen>
@@ -16,5 +17,6 @@
       document.querySelector('scan-loading-screen').remove();
     })
   </script>
+  <noscript>Please enable JavaScript to continue using this application.</noscript>
 </body>
 </html>