app.routing.module.ts with CustomPreloadingService Provider

app.module.routing.ts

import { NgModule } from '@angular/core';
import { RouterModule } from '@angular/router';
import { CustomPreloadingService } from '@razroo/common/ui/services';

@NgModule({
  imports: [
    RouterModule.forRoot(
      [
        // ...routes go here
      ],
      {
        preloadingStrategy: CustomPreloadingService
        //...
      }
    )
  ],
  exports: [RouterModule]
})
export class RazrooAppRoutingModule {}