Load new modules dynamically in run-time with Angular CLI & Angular 5

I was facing the same problem. As far as I understand it until now:

Webpack puts all resources in a bundle and replaces all System.import with __webpack_require__. Therefore, if you want to load a module dynamically at runtime by using SystemJsNgModuleLoader, the loader will search for the module in the bundle. If the module does not exist in the bundle, you will get an error. Webpack is not going to ask the server for that module. This is a problem for us, since we want to load a module that we do not know at build/compile time.
What we need is loader that will load a module for us at runtime (lazy and dynamic). In my example, I am using SystemJS and Angular 6 / CLI.

1. Install SystemJS: npm install systemjs –save
2. Add it to angular.json: “scripts”: [ “node_modules/systemjs/dist/system.src.js”]

app.component.ts

import { Compiler, Component, Injector, ViewChild, ViewContainerRef } from '@angular/core';

import * as AngularCommon from '@angular/common';
import * as AngularCore from '@angular/core';

declare var SystemJS;

@Component({
  selector: 'app-root',
  template: '<button (click)="load()">Load</button><ng-container #vc></ng-container>'
})
export class AppComponent {
  @ViewChild('vc', {read: ViewContainerRef}) vc;

  constructor(private compiler: Compiler, 
              private injector: Injector) {
  }

  load() {
    // register the modules that we already loaded so that no HTTP request is made
    // in my case, the modules are already available in my bundle (bundled by webpack)
    SystemJS.set('@angular/core', SystemJS.newModule(AngularCore));
    SystemJS.set('@angular/common', SystemJS.newModule(AngularCommon));

    // now, import the new module
    SystemJS.import('my-dynamic.component.js').then((module) => {
      this.compiler.compileModuleAndAllComponentsAsync(module.default)
            .then((compiled) => {
                let moduleRef = compiled.ngModuleFactory.create(this.injector);
                let factory = compiled.componentFactories[0];
                if (factory) {
                    let component = this.vc.createComponent(factory);
                    let instance = component.instance;
                }
            });
    });
  }
}

my-dynamic.component.ts

import { NgModule, Component } from '@angular/core';
import { CommonModule } from '@angular/common';

import { Other } from './other';

@Component({
    selector: 'my-dynamic-component',
    template: '<h1>Dynamic component</h1><button (click)="LoadMore()">LoadMore</button>'
})    
export class MyDynamicComponent {
    LoadMore() {
        let other = new Other();
        other.hello();
    }
}
@NgModule({
    declarations: [MyDynamicComponent],
    imports: [CommonModule],
})
export default class MyDynamicModule {}

other.component.ts

export class Other {
    hello() {
        console.log("hello");
    }
}

As you can see, we can tell SystemJS what modules already exist in our bundle. So we do not need to load them again (SystemJS.set). All other modules that we import in our my-dynamic-component (in this example other) will be requested from the server at runtime.