Yarn Classic (v1)

Package Management

bash

# 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yarn outdated               # Check for updates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

bash

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

Yarn Modern (v4/Berry)

Setup

bash

# Enable modern yarn
corepack enable
yarn set version stable

Package Management

bash

# 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

bash

# 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)

bash

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

# List plugins
yarn plugin list

Common to Both

Info Commands

bash

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

Cache

bash

yarn cache clean            # v1
yarn cache clear            # v4

Configuration

bash

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

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

package.json Scripts

json

{
  "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`