问如何在使用babel编译成es5后实例化一个新的类？

EN

// index.mjs

class DoSomething{
    constructor(){
        console.log("Constructing");
    }
    doSomethingElse(){
        console.log("Something else");
    }
}

export { DoSomething }

  rules: [
      {
          test: /\.mjs$/,
          exclude: /(node_modules|bower_components)/,
          use: {
              loader: 'babel-loader',
              options: {
                  presets: ['@babel/preset-env']
              }
          }
      }
  ]

 //dist/sce.cjs
...
var DoSomething =
/*#__PURE__*/
function () {
  function DoSomething() {
    _classCallCheck(this, DoSomething);
    console.log("Constructing");
  }

  _createClass(DoSomething, [{
    key: "doSomethingElse",
    value: function doSomethingElse() {
      console.log("Something else");
    }
  }]);
  return DoSomething;
}();

var lib = require("../dist/sce.cjs");
(function(){
    var instance = new lib.DoSomething();
    instance.doSomethingelse();
})()