import { EventEmitter, OnInit, OnDestroy, ChangeDetectorRef, AfterViewInit } from '@angular/core';
import * as i0 from "@angular/core";
export declare class TourBackdropComponent implements OnInit, AfterViewInit, OnDestroy {
    private cdr;
    targetElement: HTMLElement;
    color: string;
    padding: number;
    backdropClick: EventEmitter<void>;
    isVisible: boolean;
    highlightStyle: {
        top: number;
        left: number;
        width: number;
        height: number;
    };
    private resizeObserver?;
    private mutationObserver?;
    constructor(cdr: ChangeDetectorRef);
    ngOnInit(): void;
    ngAfterViewInit(): void;
    ngOnDestroy(): void;
    onBackdropClick(): void;
    private updateHighlightPosition;
    private setupObservers;
    private cleanupObservers;
    private handleScroll;
    private handleResize;
    static ɵfac: i0.ɵɵFactoryDeclaration<TourBackdropComponent, never>;
    static ɵcmp: i0.ɵɵComponentDeclaration<TourBackdropComponent, "ngx-tour-backdrop", never, { "targetElement": "targetElement"; "color": "color"; "padding": "padding"; }, { "backdropClick": "backdropClick"; }, never, never>;
}