gistfile1.txt

const emitKeyEvents = (obj, path = null) => {
  return new Proxy(obj, {
    get: (target, key, receiver) => {
      if (typeof target[key] === 'object' && target[key] !== null) {
        return emitKeyEvents(target[key], path ? `${path}.${key}` : key);
      }
      return Reflect.get(target, key, receiver);
    },
    set: (target, key, value, receiver) => {
      this.emit(path ? `${path}.${key}` : key, value);
      return Reflect.set(target, key, value, receiver);
    }
  });
};