Yarn 16 🧶 Cheatsheet

1. Toolchain & Corepack

corepack enable               # Enable Corepack (Node.js 16.10+)
yarn set version stable       # Use latest Yarn Berry (4.x)
yarn set version classic      # Downgrade to Yarn 1.x
yarn set version 4.5.0        # Pin exact Yarn version
yarn --version                # Check active Yarn version

2. Project Initialization

yarn init                     # Create public package.json
yarn init -p                  # Create private package.json
yarn init -w                  # Create workspace root (monorepo)
yarn init -i=latest           # Initialize with version lock

3. Dependency Management

yarn add <pkg>                # Add to dependencies
yarn add -D <pkg>             # Add to devDependencies
yarn add -P <pkg>             # Add to peerDependencies
yarn add -O <pkg>             # Add to optionalDependencies
yarn add <pkg>@<version>      # Add exact version
yarn remove <pkg>             # Remove a dependency
yarn up <pkg>                 # Upgrade package to latest (Berry)
yarn up --interactive         # Choose upgrades interactively
yarn up '*'                   # Upgrade all packages

4. Installation & Lockfile

yarn install                  # Install dependencies
yarn install --immutable      # CI: fail if lockfile changes
yarn install --immutable-cache # CI: fail if cache changes (Zero-Installs)
yarn install --check-cache    # CI: verify package checksums
yarn install --mode=skip-build # Skip postinstall scripts

5. Running Scripts & Binaries

yarn <script>                 # Run package.json script (no 'run' needed)
yarn run <script>             # Explicit run command
yarn run <bin>                # Run binary from dependencies
yarn run --binaries-only <bin># Skip scripts, force binary
yarn dlx <pkg>                # Run package without installing (npx equivalent)

6. Workspaces (Monorepos)

yarn workspaces foreach -Apt run <script>  # Run script across all workspaces (-A=all, -p=parallel, -t=topological)
yarn workspaces foreach --since=origin/main run test # Only changed workspaces
yarn workspaces focus <name>  # Install only dependencies for one workspace
yarn workspaces focus -A --production # Focus all, omit devDependencies

7. Configuration (.yarnrc.yml)

nodeLinker: pnp               # pnp (default), node-modules, or pnpm
enableGlobalCache: false      # false = .yarn/cache (Zero-Installs), true = ~/.yarn
yarnPath: .yarn/releases/yarn-4.5.0.cjs # Pin local binary
npmRegistryServer: "https://registry.npmjs.org"
npmAuthToken: "${NPM_TOKEN}"  # Inject secret via env var
npmScopes:
  my-org:
    npmRegistryServer: "https://npm.internal.com"
    npmAuthToken: "${INTERNAL_TOKEN}"

8. Plug’n’Play (PnP)

yarn dlx @yarnpkg/pnpify --sdk vscode  # Generate IDE SDK for VS Code
yarn config set nodeLinker node-modules # Fallback if PnP breaks tools

9. Zero-Installs

# .yarnrc.yml
enableGlobalCache: false
nodeLinker: pnp

# .gitignore
.yarn/*
!.yarn/cache
!.pnp.cjs
!.pnp.loader.mjs

git add .yarn/cache .pnp.cjs yarn.lock

10. Patching Dependencies

yarn patch <pkg>              # Extract package to temp folder
yarn patch <pkg> --update     # Extract with existing patch applied
yarn patch-commit -s <folder> # Save patch and update package.json

11. Publishing Packages

yarn npm publish              # Publish current workspace
yarn npm publish --dry-run    # Preview tarball without publishing
yarn npm publish --access public # Public scoped package
yarn npm publish --tag beta   # Attach dist-tag
yarn npm publish --provenance # CI only: link to source repo

12. Cache & Registry Management

yarn cache clean              # Clear cache
yarn config get cacheFolder   # Get path to global/local cache
yarn npm info <pkg>           # View package registry metadata

13. Environment Variables

CI=true                       # Automatically enables immutable installs
YARN_ENABLE_IMMUTABLE_INSTALLS=0 # Override immutable for a single command
YARN_ENABLE_HARDENED_MODE=1   # Enable hardened mode for non-PR workflows

14. CI/CD GitHub Actions (Standard)

- uses: actions/checkout@v4
- name: Enable Corepack
  run: corepack enable
- name: Install dependencies
  run: yarn install --immutable

15. npm to Yarn Migration

# To Yarn Classic:
yarn import                   # Convert package-lock.json to yarn.lock

# To Yarn Berry:
corepack enable
yarn set version berry
rm package-lock.json          # Delete npm lockfile
# Translate .npmrc to .yarnrc.yml (Berry ignores .npmrc)
yarn install

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