Test.coffee

class Test 
  constructor: (a, b) ->
    console.log(a, b);
  
  
  method: ->
    # method
  
  
  @method: ->
    # static
  

Test.js

class Test {
  constructor(a, b) {
    console.log(a, b);
  }
  
  method() {
    // method
  }
  
  static method() {
    // static
  }
}

Test.out.coffee

var Test;

Test = (function() {
  function Test(a, b) {
    console.log(a, b);
  }

  Test.prototype.method = function() {};

  Test.method = function() {};

  return Test;

})();

Test.out.js

"use strict";

var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var Test = (function () {
  function Test(a, b) {
    _classCallCheck(this, Test);

    console.log(a, b);
  }

  _createClass(Test, [{
    key: "method",
    value: function method() {
      // method
    }
  }], [{
    key: "method",
    value: function method() {
      // static
    }
  }]);

  return Test;
})();