title: How to use webpack-dev-server with multiple webpack configs?
body: <p>Imagine I have a project like this:</p>
  
  <pre><code>/moduleA/src...
  /moduleB/src...
  /mainApp/src...
  </code></pre>
  
  <p>I have a separate webpack.config for each module and the main app.  The modules are libraries and the main app imports those libraries.</p>
  
  <p>Is it possible to configure webpack-dev-server to serve all three? </p>
  
  <p>What I want to avoid is having to stop the dev server, rebuild moduleA and moduleB, and restart the dev server, every time I want to make a change to moduleA or B.</p>