NgModule-template.js

@NgModuel({
    imports: [],        // Import other module
    declarations: [],   // The components, directives and pipe belong to this module
    providers: [],      // Provide service (class name) that's defined in **this** module. External service is not needed here.
    exports: [],        // Export **declarable** classes so that other module can use. This is the public API of the component..
    entryComponents: [], // A list of components that are not referenced in a reachable component template in this moodule.
    bootstrap: []       // Usually root component.
})
export class AppModule { }