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

// angular
    CommonModule,
    HttpClientModule,
    ReactiveFormsModule,

    // 3rd party UI
    FontAwesomeModule,
    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,

beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [TranslateModule.forRoot(), NgbCollapseModule.forRoot()],
      declarations: [SearchSidebarComponent],
      schemas: [NO_ERRORS_SCHEMA],
    })
      .compileComponents();  // compile template and css
  }));

beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [
        NgbCollapseModule.forRoot()
      ],
      declarations: [
        HeaderComponent,
        RouterLinkStubDirective,
        RouterLinkActiveStubDirective
      ]
    })
      .compileComponents()
      .then(() => {
        fixture = TestBed.createComponent(HeaderComponent);
        component = fixture.componentInstance;
      });
  }));

export function configureSearchComponentTestingModule(compType) {
  TestBed.configureTestingModule({
    imports: [TranslateModule.forRoot(), RouterTestingModule.withRoutes([]), NoopAnimationsModule, NgbCollapseModule.forRoot()],
    declarations: [compType],
    providers: [
      { provide: SearchService, useValue: searchServiceStub },
      {
        provide: CommunityDataService,
        useValue: jasmine.createSpyObj('communityService', ['findById', 'findAll'])
      },
      { provide: ActivatedRoute, useValue: activatedRouteStub },
      { provide: RouteService, useValue: routeServiceStub },
      {
        provide: Store, useValue: store
      },
      {
        provide: HostWindowService, useValue: jasmine.createSpyObj('hostWindowService',
          {
            isXs: observableOf(true),

import scss from 'highlight.js/lib/languages/scss';
import xml from 'highlight.js/lib/languages/xml';
import {MatPagesModule} from '@angular-material-extensions/pages';

export function hljsLanguages() {
  return [
    {name: 'typescript', func: typescript},
    {name: 'scss', func: scss},
    {name: 'xml', func: xml}
  ];
}

@NgModule({
  imports: [
    RouterModule,
    NgbCollapseModule.forRoot(),
    MatPasswordStrengthModule.forRoot(),
    MatPagesModule.forRoot(),
    DisqusModule.forRoot('mat-password-strength'),
    HighlightModule.forRoot({
      languages: hljsLanguages
    }),
    FormsModule,
    ReactiveFormsModule,
    FlexLayoutModule,
    MatCardModule,
    MatInputModule,
    MatIconModule,
    MatDividerModule,
    MatProgressBarModule,
    MatSlideToggleModule,
    MatSnackBarModule,

import {RouterModule} from '@angular/router';
import {NgModule} from '@angular/core';
import {NgbCollapseModule} from '@ng-bootstrap/ng-bootstrap';

import {HeaderComponent} from './header/header.component';
import {FooterComponent} from './footer/footer.component';
import {ContentWrapperComponent} from './content-wrapper/content-wrapper.component';
import {FlexLayoutModule} from '@angular/flex-layout';
import {MatCardModule, MatInputModule} from '@angular/material';
import {MarkdownModule} from 'ngx-markdown';

@NgModule({
  imports: [RouterModule,
    NgbCollapseModule.forRoot(),
    MarkdownModule.forChild(),
    FlexLayoutModule,
    MatInputModule,
    MatCardModule
  ],
  exports: [
    HeaderComponent,
    FooterComponent,
    ContentWrapperComponent,
    FlexLayoutModule,
    MarkdownModule,
    MatInputModule,
    MatCardModule
  ],
  declarations: [HeaderComponent, FooterComponent, ContentWrapperComponent],
  providers: [],

beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [TranslateModule.forRoot(), RouterTestingModule.withRoutes([]), NoopAnimationsModule, NgbCollapseModule.forRoot()],
      declarations: [MyDSpacePageComponent, RoleDirective],
      providers: [
        { provide: SearchService, useValue: searchServiceStub },
        {
          provide: CommunityDataService,
          useValue: jasmine.createSpyObj('communityService', ['findById', 'findAll'])
        },
        { provide: ActivatedRoute, useValue: activatedRouteStub },
        { provide: RouteService, useValue: routeServiceStub },
        {
          provide: Store, useValue: store
        },
        {
          provide: HostWindowService, useValue: jasmine.createSpyObj('hostWindowService',
            {
              isXs: observableOf(true),

beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [
        AppRoutingModule,
        NgbCollapseModule.forRoot()],
      declarations: [
        HeaderComponent,
        GettingStartedComponent,
        HomeComponent]
      ,
      providers: [{ provide: APP_BASE_HREF, useValue: '/' }]
    })
      .compileComponents();
  }));

MatSlideToggleModule,
  MatSnackBarModule,
  MatTooltipModule,
  MatButtonModule
} from '@angular/material';
import {FlexLayoutModule} from '@angular/flex-layout';
import {FormsModule, ReactiveFormsModule} from '@angular/forms';
import {MatFaqModule} from '@angular-material-extensions/faq';

import {HighlightModule} from 'ngx-highlightjs';
import {NgxMaterialPagesModule} from 'ngx-material-pages';

@NgModule({
  imports: [
    RouterModule,
    NgbCollapseModule.forRoot(),
    MatFaqModule.forRoot(),
    NgxMaterialPagesModule.forRoot(),
    HighlightModule,
    FormsModule,
    ReactiveFormsModule,
    FlexLayoutModule,
    MatCardModule,
    MatInputModule,
    MatIconModule,
    MatDividerModule,
    MatProgressBarModule,
    MatSlideToggleModule,
    MatSnackBarModule,
    MatTooltipModule,
    MatButtonModule
  ],

import { RouterModule } from '@angular/router';
import { NgModule } from '@angular/core';
import { NgbCollapseModule } from '@ng-bootstrap/ng-bootstrap';

import { HeaderComponent } from './header/header.component';
import { FooterComponent } from './footer/footer.component';
import { ContentWrapperComponent } from './content-wrapper/content-wrapper.component';

@NgModule({
    imports: [RouterModule, NgbCollapseModule.forRoot() ],
    exports: [HeaderComponent, FooterComponent, ContentWrapperComponent],
    declarations: [HeaderComponent, FooterComponent, ContentWrapperComponent],
    providers: [],
})
export class AppSharedModule { }