next.js/examples/with-yarn-workspaces/package.json

{
  "private": true,
  "workspaces": ["packages/*"],
  "scripts": {
    "dev": "yarn --cwd packages/web-app dev",
    "build": "yarn --cwd packages/web-app build",
    "start": "yarn --cwd packages/web-app start"
  }
}