declare type UpdaterFn<T> = (value: T) => T;
declare type Curry1<T> = (arr: T[]) => T[];
declare type Curry2<T> = {
    (index: number): Curry1<T>;
    (index: number, arr: T[]): T[];
};
declare type Curry3 = {
    <T>(updaterFn: UpdaterFn<T>): Curry2<T>;
    <T>(reducingFn: UpdaterFn<T>, index: number): Curry1<T>;
};
declare type _Update_ = <T>(updaterFn: UpdaterFn<T>, index: number, arr: T[]) => T[];
declare type Update_ = _Update_ & Curry3;
/**
 * Creates a new array with a new value at the provided index,
 * calculated by updater function that maps an old value into a new one.
 *
 * If the index is out of bound of the array throws an error.
 *
 * @param value New value
 * @param index Specific index
 * @param arr Initial array
 * @returns New array
 */
declare const update_: Update_;
export { update_ };
export default update_;