kr-corekit

Language: English | 한국어 | 简体中文 | 日本語

A utility toolkit for JavaScript and TypeScript built with a clear, practical API design.

Highlights

• 130+ utility functions across string, array, object, async, promise, date, math, lang and more
• Tree-shake friendly module exports
• TypeScript-first with generated .d.ts files
• ESM/CJS bundle output

Installation

npm install kr-corekit
# or
pnpm add kr-corekit
# or
yarn add kr-corekit

Quick Start

import {
  stringUtil,
  arrayUtil,
  objectUtil,
  asyncUtil,
  promiseUtil,
  dateUtil,
  mathUtil,
  langUtil,
} from "kr-corekit";

const id = stringUtil.camelCase("user profile id"); // userProfileId
const rows = arrayUtil.chunk([1, 2, 3, 4, 5], 2); // [[1,2], [3,4], [5]]
const city = objectUtil.get({ user: { profile: { city: "Seoul" } } }, "user.profile.city");

const mapped = await asyncUtil.mapAsync([1, 2, 3], async (v) => v * 2);
const safe = await promiseUtil.withTimeout(fetch("/api/health"), 1000);

const tomorrow = dateUtil.addDays(new Date(), 1);
const average = mathUtil.mean([10, 20, 30]);
const enabled = langUtil.toBoolean("yes");

Modules

• stringUtil: case conversion, HTML escape/unescape, truncate, slugify
• arrayUtil: chunk, flatten, uniq/uniqBy, groupBy, sortBy, set ops, sampling
• collectionUtil: map/filter/reduce/find/every/some/includes over arrays/objects
• objectUtil: get/set/has/merge/defaults/pick/omit/deepClone/deepFreeze
• numberUtil: clamp, inRange, random, ceil/floor/round, sum/subtract/multiply
• mathUtil: mean/median/min/max/sumBy/minBy/maxBy
• dateUtil: add/sub days/hours, start/end of day, formatDate, date comparisons
• langUtil: toBoolean/toNumber/toString/defaultTo/castArray/isEqual
• asyncUtil: pLimit, mapAsync, filterAsync, eachAsync, series, parallel
• promiseUtil: defer, withTimeout, retryWithDelay, settle, toResult
• plus existing: commonUtil, functionUtil, validationUtil, formatUtil, typeUtil, cookieUtil, deviceUtil, searchQueryUtil

Tree-Shaking Import

import { camelCase } from "kr-corekit/stringUtil";
import { chunk } from "kr-corekit/arrayUtil";
import { get } from "kr-corekit/objectUtil";
import { mapAsync } from "kr-corekit/asyncUtil";
import { withTimeout } from "kr-corekit/promiseUtil";

Full API Examples

• See docs/API_EXAMPLES.md for examples of all public APIs.

Benchmark

npm run benchmark

This runs a local micro-benchmark script at benchmark/index.mjs after build.

Latest local sample (2026-02-25):

array.chunk       ~1,065,050 ops/s
object.get        ~2,681,055 ops/s
string.camelCase  ~1,902,407 ops/s
async.mapAsync    ~1,514,005 ops/s

Notes

• Full API list is available via module entry files under package/*/index.ts and generated types under dist/types/*/index.d.ts.
• If you want function-level docs/examples expanded further, keep language files in sync when updating.

License

MIT