import React, { ReactElement } from 'react';
import { InnerProps } from '../../utils';
import { Router } from '../../models';
interface ScrollspyDefaultProps {
    currentClassName: string;
    sectionOffset: number;
    headerHeight: number;
}
export interface ScrollspyProps extends Partial<ScrollspyDefaultProps> {
    items: string[];
    children: ReactElement[];
    router: Router;
    onSectionClick?: (event: MouseEvent) => void;
    className?: string;
    scrollToListItem?: boolean;
}
interface ScrollspyState {
    targetItems: HTMLElement[];
    inViewState: boolean[];
}
declare type ScrollspyInnerProps = InnerProps<ScrollspyProps, ScrollspyDefaultProps>;
export declare class Scrollspy extends React.Component<ScrollspyInnerProps, ScrollspyState> {
    static defaultProps: ScrollspyDefaultProps;
    containerRef: React.RefObject<HTMLUListElement>;
    itemRefs: React.RefObject<HTMLDivElement>[];
    scrollByClick: boolean;
    firstItemIndexInView: number;
    lastItemIndexInView: number;
    constructor(props: ScrollspyInnerProps);
    componentDidMount(): void;
    componentDidUpdate(prevProps: Readonly<ScrollspyProps>, prevState: Readonly<ScrollspyState>): void;
    componentWillUnmount(): void;
    render(): JSX.Element;
    private updateFirstItemIndexInView;
    private getContainerValues;
    private updateScrollValues;
    private syncScroll;
    private scrollToListItem;
    private initItems;
    private initSections;
    private saveActiveItems;
    private getViewState;
    private handleScroll;
    private handleScrollDebounced;
    private pauseScrollHandler;
    private handleSectionClick;
}
export {};