import { IndexedPredicate } from "../types/IndexedPredicate";
/**
 * Counts the elements of the source iterable that satisfy the optional predicate.
 *
 * @typeParam T - Element type produced by the source iterable.
 * @param src - Source iterable to enumerate.
 * @param pred - Predicate receiving each element and its index; truthy results increment the count.
 * @returns Number of elements accepted by `pred`, or the total element count when omitted.
 * @throws Error Rethrows any error thrown by `pred`.
 *
 * @example
 * ```ts
 * const evens = _count([1, 2, 3, 4], (value) => value % 2 === 0);
 * console.log(evens); // 2
 * ```
 *
 * or using the curried version:
 * ```ts
 * const evens = pipeInto([1, 2, 3, 4], count((value) => value % 2 === 0));
 * console.log(evens); // 2
 * ```
 */
export declare function _count<T>(src: Iterable<T>, pred: IndexedPredicate<T> | undefined): number;
/**
 * Curried version of {@link _count}.
 */
export declare const count: <T>(pred: IndexedPredicate<T> | undefined) => (src: Iterable<T>) => number;