export declare type Order = 'asc' | 'desc';
export declare function descendingComparator<T>(a: T, b: T, orderBy: keyof T): number;
export declare function getComparator<Key extends keyof any>(order: Order, orderBy: Key): (a: {
    [key in Key]: number | string | Date;
}, b: {
    [key in Key]: number | string | Date;
}) => number;
export declare function stableSort<T>(array: T[], comparator: (a: T, b: T) => number): T[];