/** by default, it compares by reference
 * supposed to be overwritten by user
 */
export declare let dataEqual: (x: any, y: any) => boolean;
export declare let overwriteComparator: (f: (x: any, y: any) => boolean) => void;
export declare let roughIntPow: (x: number, times: number) => number;
export declare let divideTernarySizes: (size: number) => {
    left: number;
    middle: number;
    right: number;
};
export declare function shallowCloneArray<T>(xs: Array<T>): Array<T>;
export declare let cmp: (x: any, y: any) => 0 | 1 | -1;
export declare let deepEqual: (x: any, y: any) => boolean;