import { type SortCompareFunction } from '../sort';
import { type ReadStringFunction } from './string';
/**
 * SortCompareFunction by string.
 */
export type SortByStringFunction<T> = SortCompareFunction<T>;
/**
 * Creates a {@link SortByStringFunction} that sorts values in ascending alphabetical order using `localeCompare`.
 *
 * @param readStringFn - Function to extract a string from each value for comparison.
 * @returns A comparator function suitable for use with `Array.sort()`.
 */
export declare function sortByStringFunction<T>(readStringFn: ReadStringFunction<T>): SortByStringFunction<T>;
/**
 * Input type for objects that can be sorted by their `label` property.
 */
export interface SortByLabelInput {
    label: string;
}
/**
 * Pre-configured sort comparator that sorts objects by their `label` property in ascending alphabetical order.
 */
export declare const sortByLabelFunction: SortByStringFunction<SortByLabelInput>;