yarn

name	yarn
description	Yarn commands for package management (v1 and v4/berry)
argument-hint	[command or question]
allowed-tools	Bash, Read

Help with Yarn based on $ARGUMENTS.

Yarn Classic (v1)

Package Management

# Initialize
yarn init
yarn init -y

# Install
yarn                        # Install from yarn.lock
yarn add lodash             # Add dependency
yarn add -D typescript      # Add dev dependency
yarn add lodash@4.17.21     # Specific version

# Remove
yarn remove lodash

# Update
yarn upgrade                # Update all
yarn upgrade lodash         # Update specific
yarn outdated               # Check for updates

Scripts

yarn run build
yarn build                  # "run" is optional
yarn test
yarn dev

Yarn Modern (v4/Berry)

Setup

# Enable modern yarn
corepack enable
yarn set version stable

Package Management

# Install
yarn                        # Install dependencies
yarn add lodash
yarn add -D typescript

# Update
yarn up                     # Interactive upgrade
yarn up lodash              # Upgrade specific

# Remove
yarn remove lodash

Workspaces

# Run in workspace
yarn workspace @myorg/web build

# Run in all workspaces
yarn workspaces foreach run build

# Add to workspace
yarn workspace @myorg/web add lodash

Plugins (v4)

# Import plugins
yarn plugin import typescript
yarn plugin import workspace-tools

# List plugins
yarn plugin list

Common to Both

Info Commands

yarn why lodash             # Why is package installed
yarn list                   # List dependencies
yarn info lodash            # Package info

Cache

yarn cache clean            # v1
yarn cache clear            # v4

Configuration

# .yarnrc.yml (v4)
nodeLinker: node-modules    # Use node_modules
enableGlobalCache: true

# Or use PnP (Plug'n'Play)
nodeLinker: pnp

package.json Scripts

{
  "scripts": {
    "dev": "vite",
    "build": "tsc && vite build",
    "test": "vitest",
    "lint": "eslint src/"
  }
}

Yarn vs npm Commands

Action	npm	yarn
Install all	npm install	yarn
Add package	npm install pkg	yarn add pkg
Add dev	npm install -D pkg	yarn add -D pkg
Remove	npm uninstall pkg	yarn remove pkg
Run script	npm run cmd	yarn cmd
Clean install	npm ci	yarn --frozen-lockfile