import type { AnyIterable, AnySyncIterable } from "../../types";
export declare const atLazy: <T>(input: AnyIterable<T>, index: number) => Promise<T | undefined>;
/**
 * Supports negative indeces.
 */
export declare const atGreedy: <T>(input: AnyIterable<T>, index: number) => Promise<T | undefined>;
export declare const atLazySync: <T>(input: AnySyncIterable<T>, index: number) => T | undefined;
/**
 * Supports negative end indeces.
 */
export declare const atGreedySync: <T>(input: AnySyncIterable<T>, index: number) => T | undefined;