> For the complete documentation index, see [llms.txt](https://guide-angular.wishtack.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide-angular.wishtack.io/angular/project-structure-and-modules/root-module.md).

# Root Module

Une application Angular contient un seul et unique "root module" *(`AppModule` par défaut)*.

Le "root module" est un module classique dont la particularité est de définir le "root component" de l'application via la propriété `bootstrap`.

{% tabs %}
{% tab title="src/app/app.module.ts" %}

```typescript
@NgModule({

    declarations: [
        AppComponent
    ],
    imports: [
        BookModule
    ],
    bootstrap: [
        AppComponent
    ]
})
export class AppModule {
}
```

{% endtab %}
{% endtabs %}

> `bootstrap` est une liste car dans certains cas extrêmes, il est possible d'avoir plusieurs "root components".
>
> Une alternative à la propriété `bootstrap` est de surcharger la méthode `ngDoBootstrap`.

Le module `AppModule` est désigné comme "root module" via la ligne suivante du fichier `main.ts`.

{% tabs %}
{% tab title="src/main.ts" %}

```typescript
import { AppModule } from './app/app.module';

platformBrowserDynamic().bootstrapModule(AppModule);
```

{% endtab %}
{% endtabs %}

Au démarrage de l'application, Angular recherche dans le DOM *(Cf. `src/index.html`)*, **le premier élément** correspondant au **sélecteur du composant** `AppComponent` *(`wt-app`)* et injecte alors le composant à cet endroit.


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