Webpack and ES5 support

[TheMY3]

Hello, I got same problem as here: #350

Now I use v3.2.1 and my file look like this:

import * as PNotify from 'pnotify';

new PNotify({type: 'notice', text: 'text'});

When I migrate to v4 - it's works fine with ES6 modules, but I want to use ES5 scripts and can't import them, do you have solution or any ideas for webpack?