Workaround to lighthouse valid this app as a pwa. Some problem is heppening when I have lazy modules. I found an open issue that can be the same problem: github.com/angular/angular-cli/issues/9021

Author: Guilherme Andrade Pinto

src/app/app-routing.module.ts

@@ -2,17 +2,7 @@ import { NgModule } from '@angular/core';
 import { Routes, RouterModule } from '@angular/router';
 
 
-const routes: Routes = [
-  {
-    path: 'posts',
-    loadChildren: () => import('./posts/posts.module').then(mod => mod.PostModule)
-  },
-  {
-    path: '',
-    redirectTo: 'posts',
-    pathMatch: 'full'
-  }
-];
+const routes: Routes = [];
 
 @NgModule({
   imports: [RouterModule.forRoot(routes)],

src/app/app.module.ts

@@ -16,7 +16,7 @@ import { DeviceDetectorModule } from 'ngx-device-detector';
   imports: [
     BrowserModule,
     AppRoutingModule,
-    ServiceWorkerModule.register('ngsw-worker.js', { enabled: environment.production }),
+    ServiceWorkerModule.register('./ngsw-worker.js', { enabled: environment.production }),
     BrowserAnimationsModule,
     SharedModule,
     PostModule,

src/app/posts/posts.module.ts

@@ -26,8 +26,8 @@ import { environment } from '../../environments/environment';
   ],
   imports: [
     CommonModule,
+    ServiceWorkerModule.register('./ngsw-worker.js', { enabled: environment.production }),
     PostsRoutingModule,
-    ServiceWorkerModule.register('ngsw-worker.js', { enabled: environment.production, registrationStrategy: 'registerImmediately' }),
     SharedModule
   ],
 })