title: Stepwise debugging of Vue-CLI
body: <p>I have a Vue project created with the <code>Vue CLI</code> and I'm having problems with the <code>vue.config.js</code>. I would like to be able to set a breakpoint <em>within</em> the Vue CLI to step through and investigate exactly what's going on.</p>
  
  <p>For example, I'm having issues with the <code>proxy</code> setting and I would like to be able to step through <a href="https://github.com/vuejs/vue-cli/blob/1a0b59142aa8797810ca90705290d960a4ee6d1e/packages/%40vue/cli-service/lib/util/prepareProxy.js" rel="nofollow noreferrer">lib/util/prepareProxy.js</a> when I run <code>npm run serve</code>. How would I do this?</p>