Modules via data-attributes

index.js

// Require and use modules via data attributes
// your modules need to take an element as a param
// the modules live in this same folder to work
const moduleElements = document.querySelectorAll('[data-module]')

Array.prototype.forEach.call(moduleElements, el => {
  const name = el.getAttribute('data-module')
  const Module = require(`./${name}`)
  Module(el)
})

This obviously implies you are using some sort of bundler like webpack or browserify