import type { AnyIterable } from "../../types";
/**
 * Retrieves the element at a given index from an input iterable.
 *
 * @group Greedy helpers
 * @template T - The type of elements in the input iterable.
 * @param i - The index of the element to retrieve.
 * @returns A function that accepts an input iterable and returns the element at the specified index.
 *
 * @example
 * ```ts
 * const input = [1, 2, 3];
 * const elementAtIndex2 = at<number>(2)(input);
 * console.log(elementAtIndex2); // Logs 3
 * ```
 */
export declare const at: <T>(i: number) => (input: AnyIterable<T>) => Promise<T | undefined>;
/**
 * Retrieves the element at a given index from an input sync iterable.
 *
 * @group Greedy helpers
 * @template T - The type of elements in the input sync iterable.
 * @param i - The index of the element to retrieve.
 * @returns A function that accepts an input sync iterable and returns the element at the specified index.
 *
 * @example
 * ```ts
 * const input = [1, 2, 3];
 * const elementAtIndex2 = atSync<number>(2)(input);
 * console.log(elementAtIndex2); // Logs 3
 * ```
 *
 * @remarks
 * Available as `at` when imported from `peter-piper/sync`.
 */
export declare const atSync: <T>(i: number) => (input: Iterable<T>) => T | undefined;