Angular2 - Utilizing modules in Angular applications

When importing modules in app.module.ts, the process involves adding a specific entry, as seen below:

@NgModule({
  declarations: [
    AppComponent,
    HomeComponent,
    DirectoryComponent,
    FilterPipe,
    LoggingService
  ],
  imports: [
    FormsModule,
    BrowserModule,
    HttpClientModule,
    routing
  ],
  providers: [],
  bootstrap: [AppComponent]
})

However, the RouterModule module is directly utilized in ../src/app/app.routes.ts, demonstrated by the code snippet below:

import {Routes, RouterModule} from "@angular/router";
export const routes:Routes = [
    /* Each route will be an object {}*/
    {path: 'directory', component: DirectoryComponent},
    {path: '',          component: HomeComponent}
];
export const routing: ModuleWithProviders = RouterModule.forRoot(routes);

It's worth noting that there is no mention of RouterModule within the @NgModule(imports: [..]) section.


1) What are the various methods for importing an Angular module?

2) How does the import of an Angular module differ from the import of a TypeScript module?

Answer №1

The routes.ts file contains a constant named routes, which is assigned the value of RouterModule and then exported.

In your application, you import this routes constant like any other module:

@NgModule(
 .... imports: [
         routing, // using the const here
      ],
....
)

This assignment takes place on the following line:

 export const routing: ModuleWithProviders = RouterModule.forRoot(routes);

An alternative approach would be to directly use the exported routes in your app module:

@NgModule(
 .... imports: [
         RouterModule.forRoot(routes),
      ],
....

The first method entails assigning the constant to a variable before usage.

Typescript modules facilitate sharing typescript objects across files. They are utilized in various contexts, including non-angular typescript files. These are commonly seen as import statements in typescript, leading to JavaScript ES5 require statements or ES6 importing during transpilation.

Angular modules represent modular components within Angular applications, encompassing services, directives, pipes, etc., enabling seamless composition of angular apps. Discussions about angular and modules typically pertain to these angular modules due to the pervasive nature of typescript modules with multiple imports in every typescript file.

Answer №2

You've defined an entry with the label routing using the keyword const. In this context, routing actually refers to RouterModule.forRoot(routes);, indicating that it belongs to the RouterModule.

The Angular team provides a clear explanation here: https://angular.io/guide/router

It's important to note that there is no TypeScript module, only an Angular module. You have assigned the Angular module to a constant named routing in your code and exported it for use.

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