blog-typescript-features-you-should-no-longer-use-02.js

export class Person {
  @Emoji()
  name = 'Sean';
}

// Property Decorator
function Emoji() {
  return function(target: Object, key: string | symbol) {
    let val = target[key];
    
    const getter = () =>  {
        return val;
    };
    
    const setter = (next) => {
        console.log('updating name...');
        val = `${next}`;
    };
    
    Object.defineProperty(target, key, {
      get: getter,
      set: setter,
      enumerable: true,
      configurable: true,
    });
  };
}