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