The steps are essentially: 1) Install mdn-polyfills package npm install --no-save mdn-polyfills 2) Join them all together: cd node_modules/mdn-polyfills cat CustomEvent.* Element.* Function.* HTMLCanvasElement.* MouseEvent.* Node.prototype.* NodeList.* > ../../lib/mdn-polyfills/polyfill.js 3) Uninstall the package again npm uninstall --no-save mdn-polyfills