export declare function map<T extends ReadonlyArray<any>, K extends number, U>(input: T, fn: (obj: Readonly<T[K]>, key: number) => U): Array<U>;
export declare function map<T extends Readonly<any>, K extends keyof T, U>(input: T, fn: (obj: Readonly<T[K]>, key: string) => U): {
    [key in K]: U;
};