Angular AppModule Injector

import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';

// create a platform    
let platform = platformBrowserDynamic();

// save reference to the global object
window['rootInjector'] = platform.injector;

// boostrap application
platform.bootstrapModule(AppModule);

platform.bootstrapModule(AppModule).then((module) => {
  window['rootInjector'] = module.injector;
});

platform.bootstrapModule(AppModule).then((module) => {
  let applicationRef = module.injector.get(ApplicationRef);
  let rootComponentRef = applicationRef.components[0];
});