import * as React from 'react';
import { IDropdownOption } from '@fluentui/react/lib/Dropdown';
export declare class DetailsListCustomGroupHeadersExample extends React.Component<{}, {
    selectedItem: IDropdownOption;
}> {
    private _items;
    private _groups;
    constructor(props: {});
    render(): JSX.Element;
    private _onChange;
    private _onRenderDetailsHeader;
    private _onRenderGroupHeader;
    private _onRenderGroupFooter;
    private _getGroupTotalRowHeight;
    private _getGroupHeight;
    private _onToggleSelectGroup;
    private _onToggleCollapse;
}