-import { Observable, timer as observableTimer, of as ofObservable } from 'rxjs'
+import { Observable, of as ofObservable, timer as observableTimer } from 'rxjs'
import { switchMap } from 'rxjs/operators'
import { PreloadingStrategy, Route } from '@angular/router'
+import { Injectable } from '@angular/core'
+@Injectable()
export class PreloadSelectedModulesList implements PreloadingStrategy {
+
preload (route: Route, load: Function): Observable<any> {
if (!route.data || !route.data.preload) return ofObservable(null)