With the @stimulus/polyfills package imported I still get an error
TypeError: Object doesn't support property or method 'after' [object Object] in IE11.
I have babel-polyfill imported at the start of the application.js file. If I add a ChildNode.after() polyfill (from: https://github.com/jserz/js_piece/blob/master/DOM/ChildNode/after()/after().md as noted at https://developer.mozilla.org/en-US/docs/Web/API/ChildNode/after) then it will work as expected in IE11.
Am I missing some other polyfill / config?