app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

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

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    /* Id just needs to be unique, put what you want */
    BrowserModule.withServerTransition({ appId: 'universal' })
  ],
  bootstrap: [AppComponent]
})
export class AppModule {}