// src/app/app.server.module.ts
+ import { requestResponseWrapperProvider } from '@ngx-server-push/express';
+ import { ngModuleFactoryLoaderProvider } from '@ngx-server-push/preload-link-headers';
// If you want to use 
// ...

@NgModule({
  imports: [
    AppModule,
    ServerModule,
    ModuleMapLoaderModule
  ],
  providers: [
    // Add universal-only providers here
+   requestResponseWrapperProvider,
+   ngModuleFactoryLoaderProvider
  ],
  bootstrap: [ AppComponent ],
})
export class AppServerModule {}

// server.ts
+ import { providePushConfig } from '@ngx-server-push/common';
// ...

app.engine('html', ngExpressEngine({
  bootstrap: AppServerModuleNgFactory,
  providers: [
-   provideModuleMap(LAZY_MODULE_MAP)
+   provideModuleMap(LAZY_MODULE_MAP),
+   // The require path should be relative to the build output path of the server.ts
+   providePushConfig(require('./browser/ngx-server-push.config.json'))
  ]
}));

// ...

// All regular routes use the Universal engine
app.get('*', (req, res) => {
-   res.render('index', { req });
+   res.render('index', { req, res });
});

// ...