<link href="https://unpkg.com/grapesjs/dist/css/grapes.min.css" rel="stylesheet"/>
<script src="https://unpkg.com/grapesjs"></script>
<script src="path/to/grapesjs-code-editor.min.js"></script>

<div id="gjs"></div>

<script type="text/javascript">
  var editor = grapesjs.init({
      container: '#gjs',
      commands: {
        defaults: [
          window['@truenorthtechnology/grapesjs-code-editor'].codeCommandFactory(),
        ],
      },
      panels: { /* ... add the open-code button to the views panel */ },
  });
</script>