title: promise not define in IE11 in angular 9 app
body: <p>I Just created an angular 9 app and it does not load in IE11.
  I have added all the polyfills required including the  &quot;core-js/es/promise&quot; for polyfilling promise.
  But still IE11 is complaining about &quot;promise not defined&quot;.
  why angular team still have not added that polyfill in their polyfill file?
  We are transpiling our code in es5.
  I looked at the internet and got the old answers which are not applicable currently.
  I can not include any cdn link in my index.html file as per corporate policy.
  Am I missing something?</p>