Angular 5 with Universal and TransferState: app server module

app.server.module.ts

// app.server.module.ts
import { NgModule } from '@angular/core';
import { ServerModule } from '@angular/platform-server';

import { AppModule } from './app.module';
import { AppComponent } from './app.component';

@NgModule({
  imports: [
    AppModule,
    ServerModule
  ],
  bootstrap: [AppComponent],
})
export class AppServerModule { }