title: How to install multiple yarn packages using `add`?
body: <p>Using <code>npm install</code> npm install all the packages in the <code>package.json</code>. But it looks like you need to specify each package when using <code>yarn add</code> according to <a href="https://yarnpkg.com/en/docs/cli/add" rel="noreferrer">https://yarnpkg.com/en/docs/cli/add</a>.</p>
  
  <blockquote>
    <p>yarn add package-name installs the “latest” version of the package.</p>
  </blockquote>
  
  <p>This can't be correct, can it?</p>