import { Tuple } from '../adts/Tuple';
import { Maybe } from '../adts/Maybe';
export declare const head: <T>(list: T[]) => Maybe<T>;
export declare const last: <T>(list: T[]) => Maybe<T>;
export declare const tail: <T>(list: T[]) => Maybe<T[]>;
export declare const init: <T>(list: T[]) => Maybe<T[]>;
export declare const uncons: <T>(list: T[]) => Maybe<Tuple<T, T[]>>;
export declare const at: <T>(index: number, list: T[]) => Maybe<T>;