/// <reference lib="es2020" />
import { Dictionary } from "./types.js";
import { UnionToIntersection } from "utility-types";
export declare function listToDictionary<T>(list: T[], key: keyof T): Dictionary<T>;
export declare function dictionaryToList<T>(dict: Dictionary<T>): T[];
export declare function dictionaryForEach<T>(dict: Dictionary<T>, cb: (entry: T, key: string) => void): void;
/**
 * Generates a new dictionary from the original
 *
 * @example
 *     dictionaryMap({a: 1, b: 2}, (key, value) => [value, key])
 *     // {1: "a", 2: "b"}
 *
 * @param dict
 * @param cb
 */
export declare function dictionaryMap<T, R = any>(dict: Dictionary<T>, cb: (key: string, value: T, index: number) => [string, R]): Dictionary<R>;
/**
 * Returns a list for each entry
 *
 * @example
 *     dictionaryMap({a: 1, b: 2}, (value, key) => value + key)
 *     // ["a1", "b2"]
 *
 * @param dict
 * @param cb
 */
export declare function dictionaryMapList<T, R>(dict: Dictionary<T>, cb: (key: string, value: T, index: number) => R): R[];
/**
 * Reduce values of the dictionary
 *
 * @example key
 *     let list = [{gender: M, id: 1}, {gender: M, id: 2}, {gender: F, id: 3}]
 *     listToDictionaryAcc(list, "gender")
 *
 *     // Result:
 *     // {
 *     //     M: [
 *     //            {gender: M, id: 1},
 *     //            {gender: M, id: 2}
 *     //         ],
 *     //     F: [
 *     //            {gender: F, id: 3}
 *     //        ]
 *     // }
 *
 * @param list
 * @param key
 */
export declare function listToDictionaryAcc<T>(list: T[], key: keyof T): Dictionary<T[]>;
/**
 * Reduce values of the dictionary
 *
 *
 * @example predicate
 *     let list = [{gender: M, id: 1}, {gender: M, id: 2}, {gender: F, id: 3}]
 *     let predicate = (item) => item.id % 2
 *     listToDictionaryPartitioner(["even","odd"], list, predicate)
 *
 *     // Result:
 *     // {
 *     //     "even": [
 *     //            {gender: M, id: 1},
 *     //            {gender: M, id: 2}
 *     //         ],
 *     //     "odd": [
 *     //            {gender: F, id: 3}
 *     //        ]
 *     // }
 *
 * @param list
 * @param partitions
 * @param predicate
 */
export declare function listToDictionaryPartitioner<T, R extends string>(list: T[], partitions: R[], predicate: ((item: T) => number)): Record<R | "undefined", T[]>;
/**
 * Accumulate dictionary list, resulting a new dictionary of lists
 * @example
 *     let list = [
 *         {a: 5},
 *         {a: 5},
 *         {b: 10},
 *     ]

 *     listToDictionaryMergedKeys(list)
 *     // {a: [5,5], b:[10]}
 *
 * @param list
 */
export declare function listToDictionaryMergedKeys<T, U = UnionToIntersection<T>, Result = {
    [P in keyof U]: U[keyof U][];
}>(list: T[]): Result;
/**
 * Reduce dictionary values
 * @example
 *     let dict = {a: 10, b: 20}
 *     dictionaryAcc(dict, 0, (acc, value: number, key: string) => acc + value)
 *     //30
 *
 * @param dict
 * @param acc
 * @param reducer
 */
export declare function dictionaryAcc<T, Y>(dict: Dictionary<T>, acc: Y, reducer: (acc: Y, item: T, key: string) => Y): Y;