/** @internal */
import { ComboboxItem } from './Combobox';
/**
 * Case insensitive string compare.
 * @param s1 - string
 * @param s2 - string
 * @returns boolean
 */
export declare const equal: (s1: string, s2: string) => boolean;
/**
 * Sorts items in the itemslist aplfabetically on its value string.
 */
export declare const srtAlpha: (a: ComboboxItem, b: ComboboxItem) => 1 | -1;
export declare const srtSelected: (a: ComboboxItem, b: ComboboxItem) => 1 | -1;
/**
 * Get the computed width of a ref element.
 */
export declare const getWidth: (ref: Element | null) => string;
/**
 * Toggles selected item and returns updated list.
 */
export declare const toggleSelected: (source: ComboboxItem[], index: number) => ComboboxItem[];