Why does Angular need entryComponents?

The entry components improve the performance, smallest, fastest and reusable code of your production apps.

For example, if you want to load the smallest, fastest and reusable code in your production apps. These codes contain only the classes that you actually need and it should exclude the components that are never used, whether or not those components are declared in the apps.

Stayed Informed - What Are Components in Angular 5,4 and 2?

As you know, many libraries declare and export components you will never use in your app. If you do not reference them, the tree shaker drops these libraries and components from the final code package.

@NgModule({

  declarations: [

    AppComponent

  ],

  imports: [BrowserModule],

  providers: [],

  bootstrap: [AppComponent]  // bootstrapped entry component

})

export class AppModule { }

If a component is not in an entry component, the compiler skips compiling for this component.

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