How to use the angularx-flatpickr.FlatpickrModule.forRoot function in angularx-flatpickr

import { adapterFactory } from 'angular-calendar/date-adapters/date-fns';

import { SharedModule } from '@app/shared';
import { AppCalendarComponent } from './calendar/calendar.component';
import { AppCalendarHeaderComponent } from './calendar-header/calendar-header.component';

@NgModule({
  imports: [
    RouterModule.forChild([
      { path: '', component: AppCalendarComponent }
    ]),
    CalendarModule.forRoot({
      provide: DateAdapter,
      useFactory: adapterFactory
    }),
    FlatpickrModule.forRoot(),
    SharedModule
  ],
  declarations: [AppCalendarComponent, AppCalendarHeaderComponent]
})
export class AppCalendarModule { }

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { FlatpickrModule } from 'angularx-flatpickr';
import { CalendarModule, DateAdapter } from 'angular-calendar';
import { adapterFactory } from 'angular-calendar/date-adapters/date-fns';
import { NgbModalModule } from '@ng-bootstrap/ng-bootstrap';
import { DemoComponent } from './component';

@NgModule({
  imports: [
    CommonModule,
    FormsModule,
    NgbModalModule,
    FlatpickrModule.forRoot(),
    CalendarModule.forRoot({
      provide: DateAdapter,
      useFactory: adapterFactory
    })
  ],
  declarations: [DemoComponent],
  exports: [DemoComponent]
})
export class DemoModule {}

import { AngularSplitModule } from 'angular-split';
import { MarkdownKanbanComponent } from './markdown/markdown-kanban/markdown-kanban.component';

@NgModule({
  imports: [
    CommonModule,
    RouterModule,
    FormsModule,
    HttpClientModule,
    ReactiveFormsModule,
    CustomMaterialModule,
    NgxTreeDndModule,
    CalendarCommonModule,
    EcoFabSpeedDialModule,
    FlexLayoutModule,
    FlatpickrModule.forRoot(),
    AngularSplitModule.forRoot(),
    MarkdownModule.forRoot({
      markedOptions: {
        provide: MarkedOptions,
        useValue: {
          gfm: true,
          tables: true
        },
      },
    }),
    MindMapModule
  ],
  declarations: [
    CalendarHeaderComponent,
    DraggableEditableSectionComponent,
    ContentEditableDirective,