@NgModule decorator

What are the @NgModule Metadata Properties?

The @NgModule decorator identifies AppModule as a NgModule class.

The @NgModule takes a metadata object that tells Angular how to compile and launch the application.

The NgModule’s important metadata properties are as follows –
1.          providers
2.          declarations
3.          imports
4.          exports
5.          entryComponents
6.          bootstrap
7.          schemas
8.          id

The @NgModule class with the decorator and metadata properties -
@NgModule({
  providers?: Provider[]
  declarations?: Array<Type<any> | any[]>
  imports?: Array<Type<any> | ModuleWithProviders | any[]>
  exports?: Array<Type<any> | any[]>
  entryComponents?: Array<Type<any> | any[]>
  bootstrap?: Array<Type<any> | any[]>
  schemas?: Array<SchemaMetadata | any[]>
  id?: string
})


Let understand in detail about NgModule metadata is as follows-

Providers – A list of dependency injection (DI) providers and it defines the set of injectable objects that are available in the injector of this module.

Declarations - A list of declarable classes, components, directives, and pipes that belong to this module. The compiler throws an error if you try to declare the same class in multiple modules.

Imports - A list of modules and it used to import the supporting modules like FormsModule, RouterModule, CommonModule, or any other custom made feature module.

Exports - A list of declarable components, directives, pipes, and modules that an importing module can be used within a template of any component.

EntryComponents - A list of components that should be compiled when this module is defined. By default, an Angular app always has at least one entry component, the root component, AppComponent.

A bootstrapped component is an entry component that Angular loads into DOM during the application launch and other root components loaded dynamically into entry components.

Bootstrap – A list of components that are automatically bootstrapped and the listed components will be added automatically to entryComponents.

Schemas - Defines a schema that will allow any non-Angular elements and properties.

Id – The Id used to identify the modules in getModuleFactory. If left undefined, the NgModule will not be registered with getModuleFactory.
ANIL SINGH

Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
My Blogs - https://code-sample.com and https://code-sample.xyz
My Book1 - BEST SELLING ANGULAR BOOK (INCLUDING ALL VERSIONS 2, 4, 5, 6, 7)
My Book2 - ANGULAR 2 INTERVIEW QUESTIONS BOOK - Both Books are Available on WorldWide.

www.code-sample.com/. Powered by Blogger.
^