app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { UpgradeModule } from '@angular/upgrade/static';
@NgModule({
 imports: [
   BrowserModule,
   UpgradeModule
 ]
})
export class AppModule {
 constructor(private upgrade: UpgradeModule) { }
 ngDoBootstrap() {
   this.upgrade.bootstrap(document.getElementById('ng-app'), ['App'], { strictDi: true });
 }
}