import OrderedIterable from "./helpers/OrderedIterable";
/**
 * Sorts the source iterable in descending order based on a key selector.
 *
 * @typeParam T - Element type produced by the source iterable.
 * @typeParam TCmp - Key type produced by the selector.
 * @param src - Source iterable to order.
 * @param selector - Selector receiving each element and returning the key used for ordering.
 * @returns An {@link OrderedIterable} representing the descending order and supporting chained `thenByDescending` calls.
 * @throws Error Rethrows any error thrown by `selector`.
 *
 * @example
 * ```ts
 * const scores = [12, 27, 18, 27];
 * const sorted = [..._orderByDescending(scores, (value) => value)];
 * console.log(sorted); // [27, 27, 18, 12]
 * ```
 *
 * or using the curried version:
 * ```ts
 * const sorted = [
 *   ...pipeInto(
 *     [12, 27, 18, 27],
 *     orderByDescending((value) => value)
 *   ),
 * ];
 * console.log(sorted); // [27, 27, 18, 12]
 * ```
 */
export declare function _orderByDescending<T, TCmp>(src: Iterable<T>, selector: (x: T) => TCmp): OrderedIterable<T>;
/**
 * Curried version of {@link _orderByDescending}.
 */
export declare const orderByDescending: <T, TCmp>(selector: (x: T) => TCmp) => (src: Iterable<T>) => OrderedIterable<T>;