Documentation/Tools/Yarn
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Yarn

v1.4.0Apache 2.0

Yarn package manager skills with dependency validation hooks.

toolshookyarnpackage-managerdependenciesnode

Installation

Install han binary (required for hooks to work):

curl -fsSL https://han.guru/install.sh | bash

Then install this plugin:

han plugin install yarn

Overview

Yarn package manager skills with dependency validation hooks for Claude Code.

Features

  • Automatic dependency sync: Ensures yarn install runs when package.json or yarn.lock changes
  • Smart caching: Only runs when relevant files have changed
  • Frozen lockfile support: Tries --frozen-lockfile first for CI-like behavior, falls back to regular install

Installation

bash
han plugin install jutsu-yarn

Hooks

install (Stop hook)

Automatically runs when you stop Claude Code to ensure dependencies are in sync:

  • Detects directories containing yarn.lock
  • Only runs if package.json or yarn.lock have changed since last successful run
  • Attempts yarn install --check-files --frozen-lockfile first
  • Falls back to yarn install if lockfile needs updating

Configuration

You can customize the hook behavior in your project's han-config.yml:

yaml
jutsu-yarn:
  hooks:
    install:
      enabled: true
      # Override the command if needed
      # command: "yarn install"

To disable the hook for a specific project:

yaml
jutsu-yarn:
  hooks:
    install:
      enabled: false

Hooks

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Token Usage Notice

Hooks run automatically during Claude Code sessions and their output is sent to the model for processing. This may increase token usage and associated costs. Consider disabling hooks you don't need via han-config.yml.

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Stop

Runs when the main Claude Code agent has finished responding. Can verify task completion, check quality gates, or ensure documentation requirements are met before the session ends.