import React from 'react';
import { type BasedAdditionalProps, type SelectBoxOption } from './SelectBox.types';
type SelectBoxOptionGroupProps<T extends string | number | undefined = string, AdditionalProps extends BasedAdditionalProps = BasedAdditionalProps> = {
    /**
     * The group option with nested options.
     */
    groupOption: SelectBoxOption<T, AdditionalProps> & {
        options: (SelectBoxOption<T, AdditionalProps> | null | undefined)[];
    };
    /**
     * Currently selected option.
     */
    selectedOption: SelectBoxOption<T, AdditionalProps> | null;
    /**
     * Map from option value to its index in flatOptions for O(1) lookup.
     */
    valueToIndexMap: Map<string | number, number>;
    /**
     * Index of the currently tabbable option.
     */
    tabbableOptionIndex: number;
    /**
     * CSS classes from the parent component.
     */
    classes: {
        listItem: string;
    };
    /**
     * Custom render function for options.
     */
    renderOption?: (option: SelectBoxOption<T, AdditionalProps>, isSelected: boolean) => React.ReactNode;
    /**
     * Handler called when option receives focus.
     */
    onOptionFocus: (optionIndex: number) => void;
    /**
     * Handler called when option is clicked.
     */
    onOptionClick: (option: SelectBoxOption<T, AdditionalProps>) => void;
    /**
     * Handler for keyboard events on options.
     */
    onOptionKeyDown: (option: SelectBoxOption<T, AdditionalProps>) => (event: React.KeyboardEvent<HTMLLIElement>) => void;
    /**
     * Utility to find index in flatOptions by value.
     */
    findFlatOptionIndexByValue: (valueToIndexMap: Map<string | number, number>, option: SelectBoxOption<T, AdditionalProps>) => number;
};
export declare const SelectBoxOptionGroup: (<T extends string | number | undefined = string, AdditionalProps extends BasedAdditionalProps = BasedAdditionalProps>(props: SelectBoxOptionGroupProps<T, AdditionalProps>) => React.ReactElement) & {
    displayName: string;
};
export {};