Import JavaScript modules

[allthesignals]

Could someone help me understand how to approach importing Foundation's JavaScript modules as outlined in this blog post:

import { Box } from 'foundation-sites/js/foundation.util.box.js'
import { Keyboard } from 'foundation-sites/js/foundation.util.keyboard.js'
import { MediaQuery } from 'foundation-sites/js/foundation.util.mediaQuery.js'
import { Move, Motion } from 'foundation-sites/js/foundation.util.motion.js'
import { Nest } from 'foundation-sites/js/foundation.util.nest.js'
// ... plus any other utitilies you may need

I would like to create some addons for this, but I'm dead-in-the-water with the asset management behind this stuff. How might I go about doing this? I know that the new version of Foundation allows for this.

Thanks for any help!