import { PreloadingStrategy, Route } from '@angular/router';
import { Observable } from 'rxjs';
export declare var navigator: any;
export declare class CoreNetworkAwarePreloadStrategy implements PreloadingStrategy {
    constructor();
    /**
     * This method will decide if preloading of lazy loaded module can be enabled or not
     * @param route - route details
     * @param load - load() function
     */
    preload(route: Route, load: () => Observable<any>): Observable<any>;
    /**
     * This method checks the navigator.connection object's saveData property first.
     * Some mobile devices have a setting for "data saver". When this is enabled, this property will be true.
     * Therefore, if the user has decided to save their data, they did so by choice and we should not be
     * preloading bundles (which consumes data).
     * Next the code checks if the connection's effectiveType is one of the connection speeds that
     * you feel are too slow to preload the bundles.
     * The code below decides that 2g and slow-2g don;t qualify for preloading, but 3g and better do.
     * Therefore, as long as the saveData is true and the connection speed is 3g or better,
     * the bundle will be preloaded.
     */
    hasGoodConnection(): boolean;
}