title: How to troubleshoot storybook not loading stories?
body: <p>I'm trying to load up the demo storybook stories (<code>withText</code>, <code>withIcon</code>), using this <a href="https://storybook.js.org/docs/guides/guide-react/" rel="noreferrer">react guide</a>, but I cannot get any of the example stories to run.</p>
  
  <p>For the avoidance of doubt, here's the code file (Histogram.stories.js):</p>
  
  <pre><code>import React from 'react';
  import { Button } from '@storybook/react/demo';
  
  export default { title: 'Button' };
  
  export const withText = () =&gt; &lt;Button&gt;Hello Button&lt;/Button&gt;;
  
  export const withEmoji = () =&gt; (
    &lt;Button&gt;
      &lt;span role="img" aria-label="so cool"&gt;
           
      &lt;/span&gt;
    &lt;/Button&gt;
  );
  </code></pre>
  
  <p>And my <code>main.js</code></p>
  
  <pre><code>module.exports = {
      stories: ['../src/**/*.stories.jsx?'],
  };
  </code></pre>
  
  <p>When I run <code>npm run storybook</code> I get this page:</p>
  
  <p><a href="https://i.stack.imgur.com/8NNnG.png" rel="noreferrer"><img src="https://i.stack.imgur.com/8NNnG.png" alt="storybookpage with no stories"></a></p>
  
  <p>This is the output in the devconsole:</p>
  
  <pre><code>vendors~main.9bf87aec509ee033c0f8.bundle.js:135070 Download the React DevTools for a better development experience: https://fb .me/react-devtools
  DevTools failed to parse SourceMap: chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/include.preload.js.map
  DevTools failed to parse SourceMap: chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/include.postload.js.map
  DevTools failed to parse SourceMap: http://localhost:60923/unfetch.mjs.map
  </code></pre>
  
  <p>Which doesn't show what went wrong.</p>
  
  <p>Likewise I cant see whats wrong with the set up on the command line</p>
  
  <pre><code>&gt; start-storybook
  
  info @storybook/react v5.3.18
  info 
  info =&gt; Loading presets
  info =&gt; Loading presets
  info =&gt; Adding stories defined in ".storybook\main.js".
  info =&gt; Using default Webpack setup.
  info =&gt; Using base config because react-scripts is not installed.
  webpack built 618e1f89c3579e851a85 in 52146ms
  ╭────────────────────────────────────────────────────╮
  │                                                    │
  │   Storybook 5.3.18 started                         │
  │   1.37 min for manager and 1.37 min for preview    │
  │                                                    │
  │    Local:            http://localhost:60923/       │
  │    On your network:  http://192.168.0.15:60923/    │
  │                                                    │
  ╰────────────────────────────────────────────────────╯
  </code></pre>
  
  <p>The only CLI option I can find, that seems relevant, is <code>--debug-webpack</code> but this does not produce further output in my case.</p>
  
  <p>What can I do to further troubleshoot this problem?</p>