at_class.coffee

class One
  test: -> console.log 'test'
  
class @Two
  test: -> console.log 'test'

at_class.js

var One;

One = (function() {

  function One() {}

  One.prototype.test = function() {
    return console.log('test');
  };

  return One;

})();

this.Two = (function() {

  function Two() {}

  Two.prototype.test = function() {
    return console.log('test');
  };

  return Two;

})();