import { NgModule } from '@angular/core' ; import { RouterModule } from '@angular/router' ; @ NgModule ( { imports : [ RouterModule . forChild ( [ { path : 'virtual-for' , loadChildren : ( ) => import ( './virtual-for/treegrid-virtual-for.module' ) . then ( m => m . TreeGridVirtualForTestPageModule ) } ] ) ] , } ) export class TreeGridTestPageModule { }