immerjs/immer

At a glance

Rank

#198 of 401

Top 49% · #11 of 15 JavaScript repos

Checks passed

8 of 17

Full list below

Best set up for

Claude Code

Score 71.6

Needs most work for

OpenHands

Biggest fix: .openhands/setup.sh (+10.0 pts)

What to fix first

Showing fixes for Claude Code

1. 1
   AGENTS.md / CLAUDE.md

   Add an AGENTS.md covering project goals, layout, setup commands, and conventions. Aim for 800+ chars of real guidance (not boilerplate).
   +13.2 pts
2. 2
   CONTRIBUTING guide

   Add CONTRIBUTING.md describing branch naming, commit style, test commands, and the PR process.
   +5.3 pts
3. 3
   Pre-commit / git hooks

   Set up pre-commit (.pre-commit-config.yaml), husky, or lefthook to run format+lint on every commit.
   +5.3 pts

Score for each AI agent

Each agent weighs the checks by its own docs. Under each score are its top three. How each agent is scored →

Does immerjs/immer have agent instructions?

An AGENTS.md (or CLAUDE.md) at the root tells AI coding agents how to build, test and work in the repo. A few agents also read a file of their own.

AGENTS.md / CLAUDE.md

✗None at the root (no AGENTS.md, CLAUDE.md, AGENT.md, .claude/CLAUDE.md or .claude/AGENTS.md)

Agent-specific files

None: no GEMINI.md, .cursor/rules, .openhands/setup.sh, .aider.conf.yml or .agents/skills

Repos that have one

9 of 15 JavaScript repos · 221 of 401 repos on the leaderboard · See examples →

# AGENTS.md

Guidance for AI coding agents working in immerjs/immer. Create the next immutable state by mutating the current one. Written mainly in JavaScript.

## Where things are

- Dependencies are declared in `package.json`.
- Tests live in `__tests__`.
- Lint and format rules are configured in `.prettierrc`.
- Type checking is configured in `tsconfig.json`.
- CI is defined in `.github/workflows`; read it for the exact install, lint and test steps.
- Project tasks are the `scripts` in `package.json`.

## Commands

<!-- Fill in the exact commands CI runs. -->
- Install: TODO
- Test: TODO
- Lint: TODO

How immerjs/immer compares

vs leaderboard average

1.0 pts above

Average 66.8

vs JavaScript average

5.9 pts below

Average 73.7

Stars among JavaScript repos

#11 of 15

One fix for the most agents: AGENTS.md / CLAUDE.md would raise the score for all 9 agents, by up to 13.3 points.

Similar repos

Same language and host as this repo, closest in overall score.

• eslint/eslint71.1
  JavaScript · 27.6k ★
• preactjs/preact69.2
  JavaScript · 39k ★
• prettier/prettier67.9
  JavaScript · 52.4k ★
• 11ty/buildawesome66.6
  JavaScript · 20k ★
• fastify/fastify64.8
  JavaScript · 37.3k ★
• react/react64.1
  JavaScript · 251.9k ★

Same topics, any language

Repos tagged with the same GitHub topics, most shared first.

• pmndrs/zustand72.8
  TypeScript · redux