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const moduleElements = document.querySelectorAll('[data-module]');

for (let i = 0; i < moduleElements.length; i++) {
  let el = moduleElements[i];
  let name = el.getAttribute('data-module');

  if (/\s*,\s*/.test(name)) {

	  // data-module="module1, module2"
  	let re = /\s*,\s*/;
  	let nameList = name.split(re);

  	for (let j = 0; j < nameList.length; j++) {
  		let Module = require(`./modules/${nameList[j]}`).default;
  		new Module(el)
  	}
  } else if (/\s/.test(name)) {

	  // data-module="module1 module2"
  	let re = /\s/;
  	let nameList = name.split(re);
  	for (let j = 0; j < nameList.length; j++) {
  		let Module = require(`./modules/${nameList[j]}`).default;
  		new Module(el)
  	}
  } else {
	  let Module = require(`./modules/${name}`).default;
	  new Module(el)
  }
}