decorator pattern.js

const copyObj = (originObj) => {
  const originPrototype = Object.getPrototypeOf(originObj);
  let newObj = Object.create(originPrototype);
   
  const originObjOwnProperties = Object.getOwnPropertyNames(originObj);
  originObjOwnProperties.forEach((property) => {
    const prototypeDesc = Object.getOwnPropertyDescriptor(originObj, property);
     Object.defineProperty(newObj, property, prototypeDesc);
  });
  
  return newObj;
}

class Printer {
  print(text, style = '') {
    console.log(`%c${text}`, style)
  }
}

const yellowStyle = (printer) => {
  const decorator = copyObj(printer);

  decorator.print = (text, style = '') => {
    printer.print(text, `${style}color: yellow;`);
  };

  return decorator;
};

const boldStyle = (printer) => {
  const decorator = copyObj(printer);

  decorator.print = (text, style = '') => {
    printer.print(text, `${style}font-weight:bold;`);
  };

  return decorator;
};

const bigSizeStyle = (printer) => {
  const decorator = copyObj(printer);

  decorator.print = (text, style = '') => {
    printer.print(text, `${style}font-size: 36px;`);
  };

  return decorator;
};

const printer = boldStyle(bigSizeStyle(yellowStyle(new Printer())));
printer.print('something');