/**
 * Sort function for sorting in ascending order
 * @param a - The numeric value of the first object to be sorted
 * @param b - The numeric value of the second object to be sorted
 * @return The sort value
 */
export declare const sortAsc: (a: number, b: number) => number;
/**
 * Sort function for sorting in descending order
 * @param a - The numeric value of the first object to be sorted
 * @param b - The numeric value of the second object to be sorted
 * @return The sort value
 */
export declare const sortDesc: (a: number, b: number) => number;
/**
 * Return a list of indices sorted by the array
 *
 * @example
 * const X = [9, 5, 11, -1, 0];
 * const sortedIdx = argSort(X);
 * // >> [3, 4, 1, 0, 2]
 * // I.e., the smallest element is X[sortedIdx[0]] == -1
 *
 * @param array - Array of numerical values
 * @param options - Option object
 * @param options.getter - Value getter
 * @param options.comparator - Pairwise value comparator function
 * @param options.ignoreNull - If `true` ignore `null` values
 * @return Array of indices sorted by the values
 */
export declare const argSort: (array: number[], { getter, comparator, ignoreNull, }?: {
    getter?: (x: number) => number;
    comparator?: (a: number, b: number) => number;
    ignoreNull?: boolean;
}) => number[];
/**
 * Return the sort position of each element in an array or object
 *
 * @example
 * ```js
 * let array = [9, 5, 11, -1, 0];
 * let pos = sortPos(array)
 * // >> [3, 2, 4, 0, 1]
 * // I.e., the first element of `array` is at the forth position (`3`)
 *
 * let object = { 1: 9, 2: 5, 11: 11, 100: -1, 999: 0 };
 * let pos = sortPos(object)
 * // >> { 1: 3, 2: 2, 11: 4, 100: 0, 999: 1 }
 * // I.e., the `999`th element of `object` is at the second position (`1`)
 * ```
 *
 * @param ource - Array or object of numerical values
 * @param options - Option object
 * @param options.getter - Value getter
 * @param options.comparator - Sort function
 * @param options.ignoreNull - If `true` ignore `null` values
 * @return Array or object of the sorted value positions
 */
export declare const sortPos: (source: number[] | Record<string, number>, { getter, comparator, ignoreNull, }?: {
    getter?: (x: number) => number;
    comparator?: (a: number, b: number) => number;
    ignoreNull?: boolean;
}) => number[] | Record<string, number>;