/**-----------------------------------------------------------------------------------------
* Copyright © 2026 Progress Software Corporation. All rights reserved.
* Licensed under commercial license. See LICENSE.md in the project root for more information
*-------------------------------------------------------------------------------------------*/
/**
 * Defines the settings for sorting a Grid column.
 */
export interface ColumnSortSettings {
    /**
     * Enables removing the column sorting.
     */
    allowUnsort?: boolean;
    /**
     * Sets the initial sort direction when sorting from the unsorted state.
     */
    initialDirection?: 'asc' | 'desc';
}
/**
 * Specifies settings for sorting by a single column.
 */
export interface SingleSortSettings extends ColumnSortSettings {
    /**
     * Sets the sort mode of the Grid.
     */
    mode?: 'single';
}
/**
 * Specifies a modifier key for multiple column sorting [see example](https://www.telerik.com/kendo-angular-ui/components/grid/sorting/multi-sort#sort-key-modifier).
 *
 * @example
 * ```html
 * <kendo-grid [sortable]="{ mode: 'multiple', multiSortKey: 'shift' }">
 *   <kendo-grid-column field="ProductID"></kendo-grid-column>
 *   ...
 * </kendo-grid>
 * ```
 */
export type ModifierKey = 'none' | 'ctrl' | 'shift' | 'alt';
/**
 * Specifies settings for sorting by multiple columns. [see example](https://www.telerik.com/kendo-angular-ui/components/grid/sorting/multi-sort).
 */
export interface MultipleSortSettings extends ColumnSortSettings {
    /**
     * Sets the sort mode of the Grid.
     */
    mode?: 'multiple';
    /**
     * Shows sort-sequence indicators for sorting multiple columns.
     */
    showIndexes?: boolean;
    /**
     * Sets the modifier key for sorting by a second or more columns.
     *
     * By default, clicking a column adds it to the sort order (`'none'`).
     * Selecting a key modifier with the click removes sorting from all other columns.
     *
     * If set to `'ctrl'`, `'shift'`, or `'alt'`, clicking a column removes sorting from all other columns.
     * The specified key must be pressed to add the column to the sort order.
     * The `ctrl` value matches the `Command` key on macOS [see example](https://www.telerik.com/kendo-angular-ui/components/grid/sorting/multi-sort#sort-key-modifier).
     */
    multiSortKey?: ModifierKey;
}
/**
 * Defines the settings for sorting the Grid. [See example](https://www.telerik.com/kendo-angular-ui/components/grid/sorting/multi-sort).
 *
 * The available options are:
 * * `boolean`
 * * [SingleSortSettings](https://www.telerik.com/kendo-angular-ui/components/grid/api/singlesortsettings)
 * * [MultipleSortSettings](https://www.telerik.com/kendo-angular-ui/components/grid/api/multiplesortsettings)
 *
 * @example
 * ```html
 * <kendo-grid [sorting]="true"></kendo-grid>
 * ```
 */
export type SortSettings = boolean | SingleSortSettings | MultipleSortSettings;
/**
 * @hidden
 */
export declare const normalize: (...settings: (SortSettings | ColumnSortSettings)[]) => any;