import { AnyMap, ItemInMap } from "../types";
/**
 * Creates a new `map` populated with every key in the original `map` where the
 * value of each key `k` in the new map is the return value of `fn(map[k])`.
 *
 * @param map The original map.
 * @param fn A function that takes a single argument `map[k]` and returns the value of `newMap[k]`.
 * @returns A new `map` where `map[k]` is the result of `fn(map[k])`.
 */
export default function mapMap<M extends AnyMap, T>(map: M, fn: (item: ItemInMap<M>) => T): Record<keyof M, T>;