use of class in NgModule in Angular

Question

What is the use of the class in NgModule in Angular? In @Component, the class can contain variables of the component. What useful information could the class in NgModule contain?

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

score 0 · Answer 1 · answered Jun 21 '17 at 14:26

0

Your class decorated with @NgModule will be empty, it is a class just to be exported to main.ts (probably), to bootstrap your application.

And others Modules are exported as classes so they can be imported into your root module.

answered Jun 21 '17 at 14:26

Ramon Marques

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score 0 · Accepted Answer · answered Jun 21 '17 at 15:31

I use module class constructor for some configuration initialization:

@NgModule({...})
export class RecordEditorViewComponentModule {
  constructor(private viewComponent: ViewComponent) {
    viewComponent.registerComponent({

You can also use module methods to register the same module with different set of providers so several instances of a module will be instantiated. For example, the way routing module does that. Router module provides two distinct methods to register module - forRoot and forChild. They both register the same module but with different set of providers. See this answer for more details.

use of class in NgModule in Angular

2 Answers2