toss/es-toolkit

A modern JavaScript utility library that's 2-3 times faster and up to 97% smaller, a major upgrade to lodash.

About the project

es-toolkit is a JavaScript utility library providing commonly used functions such as debouncing, delaying, chunking, summing, and selecting values, with TypeScript types and a compatibility layer for Lodash. JavaScript and TypeScript developers use it when they need utility code with small bundles and performance-focused implementations, while the catalogue skills support AI coding tools working with the library.

Latest release v1.52.0 · 28 Aug 2026

8 files for Claude Code, Codex and OpenCode: compat-review, issue-label, issue-review, pr-review and 4 more — 2,737 tokens loaded in every session.

Open on GitHub es-toolkit.dev

Instructions

es-toolkit AGENTS.md AGENTS.md A 2,089 tok
es-toolkit CLAUDE.md CLAUDE.md A 648 tok

Skills

compat-review .claude/skills/compat-review/SKILL.md A 18 tok
issue-label .claude/skills/issue-label/SKILL.md A 13 tok
issue-review .claude/skills/issue-review/SKILL.md A 15 tok
pr-review .claude/skills/pr-review/SKILL.md A 14 tok
pr-triage .claude/skills/pr-triage/SKILL.md A 14 tok
release .claude/skills/release/SKILL.md A 18 tok

These files are toss/es-toolkit's own configuration — they tell Claude Code, Codex and OpenCode how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.