title: SAP Web IDE shows errors about ES6+ features
body: <pre class="lang-js prettyprint-override"><code>for (var items in _selectedContexts) {
    var downloadModel = __parsed[__parsed[items].toString().split("/")[1]][__parsed[items].toString().split("/")[2]];
    var length = downloadModel["Value"].length;
    var base64 = downloadModel["Value"];
    var bytes =  new Uint8Array(length);
    while (length--) {
      bytes[length] = base64.charCodeAt(length);
    }
    MessageToast.show(bytes.length);
  }
  </code></pre>
  
  <p>How can I initialize a <code>Uint8Array</code> in UI5? I always get "Uint8Array is not defined" in SAP Web IDE as an error message. Do I need to import any special libraries?
  I'm also using the latest SAPUI5 version and Chrome for testing so it shouldn't be a problem I guess?</p>