/////// ANGULAR
// app.module.ts
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { FeatureModule } from './feature.module.ts';

@NgModule({
  declarations: [
    // 1. declaring app component
    AppComponent
  ],
  imports: [
    BrowserModule,
    // 2. load routing module
    AppRoutingModule,
    // 3. load feature module
    FeatureModule,
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { } 

// app-routing.module.ts
import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
const routes: Routes = [];
@NgModule({
  // 4. registering routes
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { } 

// feature.module.ts
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FeatureComponentComponent } from './feature-component.component';

@NgModule({
    // 5.declaring feature component
  declarations: [FeatureComponentComponent],
  imports: [
    CommonModule
  ]
})
export class FeatureModule { } 

/////////// FUNCTIONAL
// app.module.ts
import { appRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { featureModule } from './feature.module.ts';
export const appModule = (deps) => {
    // 1. declaring app component
    define(deps.window, 'app-component, AppComponent, deps.someDeps /** projection of deps */);
    // 2. load routing module
    appRoutingModule(deps.router);
    // 3. load feature module
    featureModule(deps.someDeps /** projection of deps */);
}

// app-routing.module.ts
export const routingModule = (router: SomeRouter) => {
  // 4. registering routes
  router.addRoute(....
} 

// feature.module.ts
import { FeatureComponentComponent } from './feature-component.component';
export const featureModule = (deps) => {
    // 5.declaring feature component
    define(deps.window, 'feature-component, FeatureComponentComponent, deps.someDeps /** projection of deps */);
}