import { Source, MenuOption } from '../Listbox.types';
export declare const formatMenuItems: (source: Source | undefined) => MenuOption[];
export declare const transferItems: (to: Source | undefined, from: Source | undefined, labelItems: string[]) => {
    modifiedTo: Source;
    modifiedFrom: Source;
};
export declare const getSelectedLabels: (source: Source | undefined) => string[];
export declare const selectItems: (source: Source | undefined, labelsToSelect: string[]) => any;