declare namespace Ext {
    export namespace util {
        export interface SortableConfig {
            defaultSortDirection?: string;
            multiSortLimit?: number;
            sorters?: Ext.util.Sorter[] | object[];
            sortRoot?: string;
        }

        export class Sortable extends Ext.Base  {
            public isSortable?: boolean;
            public generateComparator(): void;
            public getFirstSorter(): Ext.util.Sorter;
            public getSorterCount(): void;
            public getSorters(): void;
            public setSorters(): void;
            public sort(sorters?: string | Ext.util.Sorter[], direction?: string, insertionPosition?: string, doSort?: boolean): Ext.util.Sorter[];
            public static createComparator(sorters?: Ext.util.Sorter[]): CallableFunction;
        }
    }
}