import { IZSort, ZSortDirection } from './sort.mjs';
/**
 * Represents a sorter algorithm that can help with building sorts based on common techniques.
 */
export interface IZSorter {
    /**
     * Gets the current sort index for the subject or -1 if it is not sorted.
     *
     * This should be 1 based.
     *
     * @param subject -
     *        The subject to sort.  If this is undefined, the subject
     *        should be considered the empty string (the object itself).
     *
     * @returns
     *        The current sort index.
     */
    index(subject?: string): number;
    /**
     * Gets the current direction that the subject is sorted.
     *
     * @param subject -
     *        The subject to check.  Undefined is considered the
     *        empty string (the object itself).
     */
    sorted(subject?: string): ZSortDirection | undefined;
    /**
     * Sorts a specific subject.
     *
     * @param subject -
     *        The subject to sort.  Undefined is considered the
     *        empty string.
     *
     * @returns
     *        The updated sort list.
     */
    sort(subject?: string): IZSort[];
}