 RouterPreloader class   The preloader optimistically loads all router configurations to make navigations into lazily-loaded sections of the application faster. See more... class RouterPreloader implements OnDestroy {
  setUpPreloading(): void
  preload(): Observable<any>
  ngOnDestroy(): void
} Description The preloader runs in the background. When the router bootstraps, the preloader starts listening to all navigation events. After every such event, the preloader will check if any configurations can be loaded lazily. If a route is protected by canLoad guards, the preloaded will not load it. Methods     setUpPreloading()        setUpPreloading(): void Parameters There are no parameters. Returns void          preload()        preload(): Observable<any> Parameters There are no parameters. Returns Observable<any>          ngOnDestroy()        ngOnDestroy(): void Parameters There are no parameters. Returns void      

    
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