Yarn

TL;DR

Was: Schneller, zuverlässiger und sicherer JavaScript-Paketmanager.

Warum: Deterministische Installationen, Workspaces, Plug’n’Play, Offline-Cache.

Quick Start

Installieren:

# npm
npm install -g yarn

# Homebrew
brew install yarn

# Check version
yarn --version

Grundlegende Verwendung:

yarn init
yarn add express
yarn install
yarn dev

Cheatsheet

Befehl	Beschreibung
yarn add pkg	Abhängigkeit hinzufügen
yarn add -D pkg	Dev-Abhängigkeit hinzufügen
yarn remove pkg	Paket entfernen
yarn install	Alle Deps installieren
yarn upgrade	Pakete aktualisieren
yarn run script	Skript ausführen
yarn dlx pkg	Paket ausführen

Gotchas

Installing packages

# Production dependency
yarn add express

# Dev dependency
yarn add -D typescript

# Global package (Yarn 1)
yarn global add nodemon

# Specific version
yarn add [email protected]

# From git
yarn add git+https://github.com/user/repo.git

Workspaces

// package.json
{
  "private": true,
  "workspaces": [
    "packages/*"
  ]
}

# Install all workspace deps
yarn install

# Run script in specific workspace
yarn workspace @myorg/web dev

# Add dep to workspace
yarn workspace @myorg/utils add lodash

# Run in all workspaces
yarn workspaces foreach run build

Yarn Berry (v2+)

# Enable Yarn Berry
yarn set version berry

# Enable Plug'n'Play
yarn config set nodeLinker pnp

# Or use node_modules
yarn config set nodeLinker node-modules

# Install
yarn install

Configuration (.yarnrc.yml)

# Yarn Berry config
nodeLinker: node-modules

# Registry
npmRegistryServer: "https://registry.npmmirror.com"

# Plugins
plugins:
  - path: .yarn/plugins/@yarnpkg/plugin-workspace-tools.cjs
    spec: "@yarnpkg/plugin-workspace-tools"

Scripts

{
  "scripts": {
    "dev": "vite",
    "build": "tsc && vite build",
    "test": "vitest"
  }
}

# Run script
yarn dev
yarn run build

# Execute binary
yarn exec vitest

# Execute without installing
yarn dlx create-react-app my-app

Useful commands

# Check why package is installed
yarn why lodash

# Upgrade interactive
yarn upgrade-interactive

# Check outdated
yarn outdated

# Clean cache
yarn cache clean

# List packages
yarn list --depth=0

Next Steps

• Yarn Documentation - Offizielle Dokumentation
• Yarn Berry - v2+ Anleitung
• Workspaces - Monorepo
• Plug’n’Play - Zero-Install