title: Why JSZip can't create blob file?
body: <p>I was trying JSZip on NodeJS to create some ZIP file but i'm facing an issue.</p>
  
  <p>I'm using the code proposed by JSZip :</p>
  
  <pre class="lang-js prettyprint-override"><code>var JSZip = require('JSZip')
  var zip = new JSZip()
  zip.file("Hello.txt", "Hello World\n")
  zip.generateAsync({type:"blob"}).then(function(content) {
      //do things here
  });
  </code></pre>
  
  <p>Currently the code throw an error on <em>generateAsync</em></p>
  
  <blockquote>
    <p>UnhandledPromiseRejectionWarning: Error: blob is not supported by this platform</p>
  </blockquote>
  
  <p>Did something need to be install or the data I set in <em>zip.file</em> should be in a certain format ?</p>