title: Angular polyfills for es6
body: <p>I was going through the the angular docs listed below and some other links on the web regarding angular. If all the code is written in Typescript what is the need for es6 polyfills. Also my understanding is that eventually webpack transpiles the code to ES5, so where do the polyfills get used?</p>
  
  <p><a href="https://angular.io/guide/browser-support" rel="nofollow noreferrer">https://angular.io/guide/browser-support</a> </p>
  
  <p><a href="https://github.com/xiaomoinfo/Angular2/blob/master/how-angular-works/inventory-app/src/polyfills.ts" rel="nofollow noreferrer">https://github.com/xiaomoinfo/Angular2/blob/master/how-angular-works/inventory-app/src/polyfills.ts</a></p>
  
  <p><a href="https://stackoverflow.com/questions/47266254/ionic-3-polyfill-for-es6-in-ie11-not-working">Ionic 3 - Polyfill for ES6 in IE11 Not Working</a></p>