import { Router } from '@angular/router';
import * as i0 from "@angular/core";
export declare class BtnPageBackService {
    private router;
    widgetUrl: string;
    previousRouteUrls: string[];
    private routerSubscription;
    constructor(router: Router);
    initialize(): void;
    getLastUrl(pageNumber?: number): {
        fragment: any;
        route: string;
        queryParams: {
            [key: string]: string;
        };
    };
    private getQParams;
    private isUrlEncoded;
    checkUrl(url: any): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<BtnPageBackService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<BtnPageBackService>;
}
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