How to use the @ng-bootstrap/ng-bootstrap.NgbDropdownModule.forRoot function in @ng-bootstrap/ng-bootstrap

TextMaskModule,

    /**
     * ng-bootstrap modules
     * only those that are used by app
     * should be imported to reduce bundle size
     */
    NgbDatepickerModule.forRoot(),
    NgbCollapseModule.forRoot(),
    NgbModalModule.forRoot(),
    NgbTabsetModule.forRoot(),
    NgbPaginationModule.forRoot(),
    NgbPopoverModule.forRoot(),
    NgbAccordionModule.forRoot(),
    NgbCarouselModule.forRoot(),
    NgbDropdownModule.forRoot(),
  ],
  exports: [
    // angular
    CommonModule,
    HttpClientModule,
    ReactiveFormsModule,

    // 3rd party UI
    FontAwesomeModule,
    TextMaskModule,

    NgbDatepickerModule,
    NgbCollapseModule,
    NgbModalModule,
    NgbTabsetModule,
    NgbPaginationModule,

import { ColorPickerModule } from 'ngx-color-picker';
import { ClipboardModule } from 'ngx-clipboard';
import { TranslateModule } from '@ngx-translate/core';

import { HomeRoutingModule } from './home-routing.module';
import { HomeComponent } from './home.component';
import { PlaygroundComponent } from './playground/playground.component';


@NgModule({
    imports: [
        CommonModule,
        FormsModule,
        HomeRoutingModule,
        NgbAccordionModule.forRoot(), 
        NgbDropdownModule.forRoot(),
        TranslateModule,
        ColorPickerModule,
        ClipboardModule],
    declarations: [HomeComponent, PlaygroundComponent],
})
export class HomeModule { }