title: highcharts-angular not rendering the chart
body: <p>I am using <code>Angular 7</code>,  <code>highcharts</code> and <code>highcharts-angular</code> to render 3 donut charts. However, they are not rendering for some reason.</p>
  
  <p>Here's a <a href="https://stackblitz.com/edit/angular-qaa4cv" rel="nofollow noreferrer">stackblitz</a> to demonstrate the issue.</p>
  
  <p>I followed this <a href="https://www.tutorialspoint.com/angular_highcharts/angular_highcharts_configuration_syntax.htm" rel="nofollow noreferrer">tutorial</a> to make it work, but it's not working.</p>
  
  <p>All 3 charts are getting the options properly, but the charts are not rendering.</p>
  
  <pre><code>&lt;div id="chart{{chartIndex}}"&gt;
  &lt;highcharts-chart&gt;
    [Highcharts] = "highcharts" 
    [options] = "options"
    style = "width: 100%; height: 100%; display: block;"
  &lt;/highcharts-chart&gt;
  &lt;/div&gt;
  </code></pre>