@NgModule({
  // Static, that is compiler configuration
  declarations: [], // Configure the selectors
  entryComponents: [], // Generate the host factory
 
  // Runtime, or injector configuration
  providers: [], // Runtime injector configuration
 
  // Composability / Grouping
  imports: [], // composing NgModules together
  exports: [] // making NgModules available to other parts of the app
})