ES6 modules with Drupal implementation (pseudocode)

carousel.js

import { slick } from 'slick';
import { jQuery as $ } from 'jquery';

export default function(context) {
  // jquery plugins not this easy in reality, tbd
  $('.carousel-thingy', context).slick();
}

drupal.carousel.js

import { Drupal } from 'Drupal';
import carousel from './carousel';

export default function() {
  Drupal.behaviors.carousel = {
     attach(context) {
        carousel(context);
     }
  }
}

plain.carousel.js

import carousel from './carsousel';

carousel();