import { ChildProperty } from '@syncfusion/ej2-base';
import { SortDescriptorModel } from './sort-settings-model';
import { SortDirection } from '../base/enum';
/**
 * Represents the field name and direction of sort column.
 */
export declare class SortDescriptor extends ChildProperty<SortDescriptor> {
    /**
     * Defines the field (column) name to sort by.
     *
     * @default ''
     */
    field: string;
    /**
     * Defines the direction of the sort operation.
     * * `Ascending`: Sorts the column in ascending order.
     * * `Descending`: Sorts the column in descending order.
     *
     * @default null
     * @isEnumeration true
     * @asptype SortDirection
     *
     */
    direction: SortDirection;
}
/**
 * Configures the sorting behavior of Gantt.
 */
export declare class SortSettings extends ChildProperty<SortSettings> {
    /**
     * Specifies the columns to sort by when the Gantt chart is initially rendered.
     * It also allows access to the currently sorted columns.
     *
     * @default []
     */
    columns: SortDescriptorModel[];
    /**
     * If `allowUnsort` set to false, the user can not get the Tree grid in unsorted state by clicking the sorted column header.
     *
     * @default true
     */
    allowUnsort: boolean;
}