title: PptxGenJS add chart show nothing
body: <p>I am working with an export function by using <a href="https://gitbrent.github.io/PptxGenJS/" rel="nofollow noreferrer">PptxGenJS</a>. It does not work <strong>even with basic example code from demo source code on official Github</strong>. I am working with export charts.</p>
  <p>My steps:</p>
  <ul>
  <li>Install PptxGenJS and import like normal npm package.</li>
  <li>Copy code from <a href="https://github.com/gitbrent/PptxGenJS/blob/master/demos/common/demos.js" rel="nofollow noreferrer">official demo</a>:
  <code>slide.addChart( pptx.charts.BAR, arrDataRegions, optsChartBar1 );</code></li>
  </ul>
  <p>The result:</p>
  <ul>
  <li>Chart show nothing in exported slider.</li>
  <li>Open with Microsoft Powerpoint 2013, it shows some error similar to <a href="https://stackoverflow.com/questions/49819105/line-charts-not-working-properly-in-powerpoint-in-v2-1-0-of-pptxgenjs">this question</a>.</li>
  <li><a href="https://codesandbox.io/s/pptxgenjs-chart-show-nothing-0tygp?file=/src/App.js" rel="nofollow noreferrer">My codesanbox</a> even worse, no file were downloaded.</li>
  </ul>
  <p>My notable package versions:</p>
  <pre><code>&quot;react&quot;: &quot;^16.13.1&quot;,
  &quot;pptxgenjs&quot;: &quot;^2.6.0&quot;,
  </code></pre>
  <p>My environment versions:</p>
  <ul>
  <li>node version: <code>v10.17.0</code></li>
  <li>npm version: <code>v6.11.3</code></li>
  <li>Windows 10 Pro 1903, OS build <code>18362.1082</code></li>
  </ul>
  <p>Both two versions of <code>Pptxgenjs</code> do not work.
  Any thoughts on this? Thanks for any idea. I'm giving up on this library.</p>