1c - Brief Introduction To Angular

1. Refactor to use lazy loaded User module

ng g module user --routing

3. Remove all references to Users in App module

src/app/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 { HomeComponent } from './home/home.component';
import { HttpClientModule } from '@angular/common/http';

@NgModule({
  declarations: [
    AppComponent,
    HomeComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

4. Change routes to lazy loaded routes

src/app/app-routing.module.ts

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { HomeComponent } from './home/home.component';

const routes: Routes = [
  { path: '', component: HomeComponent },
  { path: 'users', loadChildren: 'src/app/user/user.module#UserModule' },   ///changed
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

5. Add UserList component as feature module route

src/app/user/user-routing.module.ts

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { UserListComponent } from './user-list/user-list.component'; // changed

const routes: Routes = [
  { path: '', component: UserListComponent },    //changed
];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})
export class UserRoutingModule { }

6. Declare UserList component in new User module

src/app/user/user.module.ts

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { UserListComponent } from './user-list/user-list.component';   //added
import { UserRoutingModule } from './user-routing.module';

@NgModule({
  imports: [
    CommonModule,
    UserRoutingModule
  ],
  declarations: [
    UserListComponent            //added
  ]
})
export class UserModule { }

7. Add button on App component to navigate to UserList or Home component

src/app/app.component.html

<h1>The App</h1>

<div>
  <button [routerLink]="['/']" routerLinkActive="router-link-active" >home</button>
  <button [routerLink]="['/users']" routerLinkActive="router-link-active" >users</button>
</div>

<!-- <app-home></app-home> -->
<router-outlet></router-outlet>

8. Run the application and inspect the lazy loaded JavaScript

Extras

1. Add extra project to CLI App

As of Angular CLI version 6+ you can now have multiple projects in an Angular app. It is early days and no support for sharing modules between apps and best practices or schematics made. That is what Nx can help with. You can read more on the Angular CLI limited docs https://github.com/angular/angular-cli/wiki/stories-multiple-projects

In the terminal run

ng generate application my-other-app

2. Add npm package library to your app

Angular CLI v6 comes with library support via ng-packagr plugged into the build system we use in Angular CLI, together with schematics for generating a library.

https://github.com/angular/angular-cli/wiki/stories-create-library