title: How to manage package dependencies with gatsby-dev-cli?
body: <p>I have an intention to extend <code>gatsby-transformer-remark</code> with adding possibility of using <code>id</code> attribute inside a markdown.</p>
  
  <p>When I'm trying to launch <code>yarn watch --scope=gatsby-transformer-remark</code> in local gatsby repo and <code>gatsby-dev</code> and <code>gatsby develop</code> in parallel inside my  test site directory I have build fails caused by the lack of installed dependencies of <code>gatsby-transformer-remark</code>.</p>
  
  <p>Previously I'd followed this guide to prepare environment - <a href="https://www.gatsbyjs.org/docs/how-to-contribute/#contributing-to-the-repo" rel="nofollow noreferrer">https://www.gatsbyjs.org/docs/how-to-contribute/#contributing-to-the-repo</a>.</p>
  
  <p>How do you handle package dependencies  with <code>gatsby-dev-cli</code>?</p>