/**
 * Deliver next value in the order by cycle.
 * SORT_NONE -> SORT_ASCENDING -> SORT_DESCENDING -> SORT_NONE ...
 * @param {string|null} [orderBy]
 * @returns {string} new order either SORT_NONE, SORT_ASCENDING or SORT_DESCENDING
 */
export function toggleOrderBy(orderBy?: string | null): string;
/**
 * Add sortable toggle button to a th node.
 * Synchronizes store value with the nodes "aria-sort" attribute.
 * Usable as svelte action function.
 * @param {Element} th the header element
 * @param {writable} store keep in sync with sorting properties
 * @return {Object} with destroy function
 */
export function sortable(th: Element, store: typeof writable): any;
/**
 * Generate a sort function for a given sort-by set.
 * @param {Object|undefined} [sortBy]
 * @param {Object} [getters]
 * @return {(function(any,any):number)|undefined} sorter
 */
export function sorter(sortBy?: any | undefined, getters?: any): ((arg0: any, arg1: any) => number) | undefined;
export const SORT_NONE: "none";
export const SORT_ASCENDING: "ascending";
export const SORT_DESCENDING: "descending";
export const SORT_OTHER: "other";
export namespace orderByCycle {
    export { SORT_ASCENDING as none };
    export { SORT_DESCENDING as ascending };
    export { SORT_ASCENDING as descending };
}
import { writable } from "svelte/store";