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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)
if (typeof route.data.preload === 'number') {
return observableTimer(route.data.preload).pipe(switchMap(() => load()))
}
return load()
}
}
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