export declare const ASC_SORT_STATE = "asc";
export declare const DESC_SORT_STATE = "desc";
export declare const HEADER_SPAN_CLASS = "colHeader";
/**
 * Get if all sorted columns states are valid.
 *
 * @param {Array} sortStates The sort state collection.
 * @returns {boolean}
 */
export declare function areValidSortStates(sortStates: unknown[]): boolean;
/**
 * Get next sort order for particular column. The order sequence looks as follows: 'asc' -> 'desc' -> undefined -> 'asc'.
 *
 * @param {string|undefined} sortOrder Sort order (`asc` for ascending, `desc` for descending and undefined for not sorted).
 * @returns {string|undefined} Next sort order (`asc` for ascending, `desc` for descending and undefined for not sorted).
 */
export declare function getNextSortOrder(sortOrder?: string): "asc" | "desc" | undefined;
/**
 * Get `span` DOM element inside `th` DOM element.
 *
 * @param {Element} TH Th HTML element.
 * @returns {Element | null}
 */
export declare function getHeaderSpanElement(TH: HTMLTableCellElement): HTMLElement | null;
/**
 *
 * Get if handled header is first level column header.
 *
 * @param {number} column Visual column index.
 * @param {Element} TH Th HTML element.
 * @returns {boolean}
 */
export declare function isFirstLevelColumnHeader(column: number, TH: HTMLTableCellElement): boolean;
/**
 *  Get if header was clicked properly. Click on column header and NOT done by right click return `true`.
 *
 * @param {number} row Visual row index.
 * @param {number} column Visual column index.
 * @param {Event} clickEvent Click event.
 * @returns {boolean}
 */
export declare function wasHeaderClickedProperly(row: number, column: number, clickEvent: Event): boolean;
/**
 * Creates intl-date sorting compare function.
 *
 * @param {string} sortOrder Sort order (`asc` for ascending, `desc` for descending).
 * @param {object} columnPluginSettings Plugin settings for the column.
 * @returns {Function} The compare function.
 */
export declare function createIntlDateCompareFunction(sortOrder: string, columnPluginSettings: Record<string, unknown>): (value: unknown, nextValue: unknown) => number;
/**
 * Creates intl-time sorting compare function.
 *
 * @param {string} sortOrder Sort order (`asc` for ascending, `desc` for descending).
 * @param {object} columnPluginSettings Plugin settings for the column.
 * @returns {Function} The compare function.
 */
export declare function createIntlTimeCompareFunction(sortOrder: string, columnPluginSettings: Record<string, unknown>): (value: unknown, nextValue: unknown) => number;
/**
 * Warn users about problems when using `columnSorting` and `multiColumnSorting` plugins simultaneously.
 *
 * @param {string} workingPlugin The plugin that will work.
 * @param {string} disabledPlugin The plugin that will remain disabled.
 */
export declare function warnAboutPluginsConflict(workingPlugin: string, disabledPlugin: string): void;