import { Maybe } from './maybe';
export declare const safeInit: <A>(as: A[]) => Maybe<A[]>;
export declare const safeHead: <A>(as: A[]) => Maybe<A>;
export declare const safeLast: <A>(as: A[]) => Maybe<A>;
export declare const safeTail: <A>(xs: A[]) => Maybe<A[]>;
declare type PossibleKeyValue<A, O> = A extends keyof O ? keyof O[A] : {};
/**
 * takes an key (or index) and an array or object and returns
 * a Maybe. A Just containing the value of that object at key
 * or a Nothing if there is no value at the key index.
 */
export declare function safeProp<O, A>(k: A, obj: O): Maybe<PossibleKeyValue<A, O>>;
export declare function safeProp<O, A>(k: A): (obj: O) => Maybe<PossibleKeyValue<A, O>>;
export declare function safeIndex<A, B extends keyof A>(index: B & number, arr: A & {}[]): Maybe<A[B]>;
export declare function safeIndex<A, B extends keyof A>(index: B | number): (arr: A) => Maybe<A[B]>;
export {};