import { ComponentInterface } from '../../stencil-public-runtime';
/**
 * Back to top floating action button component.
 * Appears on scroll, given a min height for both scroll height and page height.
 */
export declare class ZanitBackTop implements ComponentInterface {
    private resizeObserver;
    private mutationObserver;
    host: HTMLZanitBackToTopElement;
    /** Indicates whether the back-to-top button is visible and usable. */
    showFab: boolean;
    /** Indicates the current height of the page. */
    currentPageHeight: number;
    /** Indicates if the viewport is mobile. */
    isMobile: boolean;
    /** Min page height from which the back-to-top button must appear. */
    pageMinHeight: number;
    /** Min scroll height from which the back-to-top button must appear. */
    scrollMinHeight: number;
    handleScroll(): void;
    private handleResize;
    connectedCallback(): void;
    disconnectedCallback(): void;
    private updateFabVisibility;
    private scroll;
    render(): any;
}