title: react app: issues running on internet explorer 11
body: <p>I have a react app. On Windows 10, it works fine on Chrome and Internet Explorer 11. But on Windows 7, it only works on Chrome, not internet explorer 11.</p>
  
  <p>I get the below error:</p>
  
  <pre><code>SCRIPT438: Object doesn't support property or method 'assign'
  </code></pre>
  
  <p>through my research this looks like a compatibility issue with IE 11 (although not sure why it works on windows 10).</p>
  
  <p>As far as I'm aware, something about polyfill/transfill(?)/babel needs to be used. But here is the bit I have the biggest issue with:</p>
  
  <p>i have a bundle.js file that contains all the site code. this is a mixture of my own code, and NPM node modules. If the issue was with my code, then I'm fine with adding an import line and changing my code. but the error comes from the npm node modules. I can't edit these files. How can I resolve this Object.assign issue without touching those files?</p>
  
  <p>I'm not really familiar with browser compatibility stuff so I'm quite stuck</p>
  
  <p>Any advice?</p>