title: What does the npm -S flag mean?
body: <p>What does the <code>-S</code> flag for npm mean? I see it referenced <a href="https://developers.google.com/apps-script/guides/typescript" rel="noreferrer">here</a> but <a href="https://docs.npmjs.com/cli/install" rel="noreferrer">https://docs.npmjs.com/cli/install</a> does not cover what the <code>-S</code> is.</p>
  
  <pre><code>npm i -S @types/google-apps-script
  </code></pre>