import { OnDestroy, OnInit } from '@angular/core';
import { ActivatedRoute, Params, Router } from '@angular/router';
/**
 * IBreadcrumb interface is used to store all required data for each breadcrumb element
 * @docs-private
*/
export interface IBreadcrumb {
    label: string;
    params?: Params;
    url: string;
}
export declare type QueryParamsHandling = 'merge' | 'preserve' | '';
/** A navigational aid that allows users to keep track of their location within the current application  */
export declare class BreadcrumbsComponent implements OnInit, OnDestroy {
    private activatedRoute;
    private router;
    _breadcrumbs: IBreadcrumb[];
    _routerSubscription: any;
    _backURL: string;
    _backShow: string;
    _locationLabel: string;
    _queryParamsHandling: QueryParamsHandling;
    /** Sets the handling of the query parameters for the breadcrumb. Choose from: `'preserve' | 'merge' | '' (default)` */
    queryParamsHandling: QueryParamsHandling;
    constructor(activatedRoute: ActivatedRoute, router: Router);
    ngOnInit(): void;
    private setBreadcrumbs;
    private getBreadcrumbs;
    ngOnDestroy(): void;
}