import React from 'react';
import type { MdComboBoxBaseProps } from './MdComboBox';
import type { MdComboBoxGroupedOption } from './MdComboBoxGrouped';
export interface MdComboBoxNestedProps extends Omit<React.InputHTMLAttributes<HTMLInputElement>, 'value'>, MdComboBoxBaseProps {
    options: MdComboBoxGroupedOption[];
    defaultOptions?: MdComboBoxGroupedOption[];
    value: string[][];
    hideSeparatorLine?: boolean;
    onSelectOption(_value: string[][]): void;
}
export declare function toggleGroupSelection(groupIndex: number, options: MdComboBoxGroupedOption[], currentFlat: string[]): string[];
export declare function computeNestedDisplayValue(selectedFlat: string[], options: MdComboBoxGroupedOption[], getTextByValue: (val: string) => string, placeholder: string): string;
declare const MdComboBoxNested: React.ForwardRefExoticComponent<MdComboBoxNestedProps & React.RefAttributes<HTMLInputElement>>;
export default MdComboBoxNested;