title: How to return an excel file from NestJS Controller
body: <p>So I am reading lots of data from my mongoose database and writing them into XLSX of SheetJS. I want to return a downloadable file from my controller. I got an object below, question is how can i return this object for download?</p>
  <pre class="lang-js prettyprint-override"><code>const wbout = XLSX.write(wb, { bookType: 'xlsx', type: 'buffer' });
  </code></pre>