title: Enable ES6 in HTML file with Visual Studio Code
body: <p>VS Code 0.8.0 warns I have to write jsconfig.json file to set ES6 option, but it seems it works only for JS files, not HTML ones. It doesn't suppress the error in HTML.</p>
  
  <p>How can I suppress this error in HTML files?</p>
  
  <p>jsconfig.json file:</p>
  
  <pre><code>{
      "compilerOptions": {
          "target": "ES6",
          "module": "commonjs"
      }
  }
  </code></pre>
  
  <p>html file:</p>
  
  <pre><code>&lt;html&gt;
  &lt;head&gt;
    &lt;meta charset="utf-8"&gt;
    &lt;title&gt;Mocha Tests&lt;/title&gt;
    &lt;script&gt;
      document.addEventListener("DOMContentLoaded", () =&gt; { // Error: This can only be used with ES6. Make sure to have a jsconfig.json-file which sets the target to ES6.
      })
    &lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id="mocha"&gt;&lt;/div&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>