7. Recipes

TypeScript + PnP quick start:

• Initialize the repo using Yarn 2:

yarn init -2

• Add typescript and enable VSCode integration:

yarn add --dev typescript
yarn dlx @yarnpkg/sdks vscode

• You can optionally enable Yarn's TypeScript plugin, which helps manage @types/* dependencies automatically.

yarn plugin import typescript

Running a Yarn CLI command in the specified directory:

• Starting a new library inside a monorepo directly, without manually creating directories for it.

yarn packages/my-new-lib init

• Running an arbitrary command inside a specific workspace:

yarn packages/app tsc --noEmit

Hybrid PnP + node_modules mono-repo:

You may sometimes need to use node_modules on just part of your workspace (for example, if you use Angular or React-Native).

• Create a separate directory for the node_modules project.

mkdir nm-packages/myproj

• Create an empty lockfile in the new project. Yarn uses lockfiles to locate the root of projects.

touch nm-packages/myproj/yarn.lock

• Add a .yarnrc.yml file inside the new directory that enables node_modules just for it (nm-packages/myproj/.yarnrc.yml):

nodeLinker: node-modules

• Add a PnP ignore pattern for this path in your main .yarnrc.yml at the root of your monorepo:

pnpIgnorePatterns:
  - ./nm-packages/**

• Run yarn to apply pnpIgnorePatterns in the repo root.
• Run cd nm-packages/myproj && yarn to install the now isolated project.