export declare type Comparator<T> = (a: T, b: T) => number;
export declare const compareBy: <T>(indexOf: (a: T) => number) => Comparator<T>;
export declare const desc: <T>(cmp: Comparator<T>) => Comparator<T>;
export declare const combineCmps: <T>(comparators: Comparator<T>[], eps?: number) => Comparator<T>;