// ES6
import defineClass from 'tui-code-snippet/defineClass/defineClass'; 

// CommonJS
const defineClass = require('tui-code-snippet/defineClass/defineClass'); 

//-- #2. Use property --//
const Parent = defineClass({
  init: function() { // constuructor
    this.name = 'made by def';
  },
  method: function() {
    // ...
  },
  static: {
    staticMethod: function() {
      // ...
    }
  }
});

const Child = defineClass(Parent, {
  childMethod: function() {}
});

Parent.staticMethod();

const parentInstance = new Parent();
console.log(parentInstance.name); //made by def
parentInstance.staticMethod(); // Error

const childInstance = new Child();
childInstance.method();
childInstance.childMethod();