You can use an environment variable to point to a CDN host and use it as a prefix in your code. But you also need to make sure the CDN assets get expired. One approach is to use the stats plugin for Webpack, parse the manifest, and write a helper so that the right files get included in the HTML.

Here is an example of how the webpack-rails gem does it: https://github.com/mipearson/webpack-rails/blob/master/lib/w...

And here is an explanation of why you would want to do that instead of using ETag headers on constant filenames: http://stackoverflow.com/questions/26272271/why-digest-are-u...

EDIT:

In fact after looking into it, Neutrino does use html-webpack-plugin which does exactly that by templating index.html: https://www.npmjs.com/package/html-webpack-template Which is cool!