clone a object's flags

realDeepClone.js

// using spread expression
let [one, two, three] = [...'12', { ...'abc' }]
const obj = { one, two, three }

function realDeepClone(obj, key, clone) {
  if (!key) {
    clone = Object.defineProperties({}, Object.getOwnPropertyDescriptors(obj))
  } else {
    clone[key] = Object.defineProperties(
      {},
      Object.getOwnPropertyDescriptors(obj)
    )
  }
  Object.keys(obj).forEach(key => {
    if (typeof obj[key] === 'object') return deepClone(obj[key], key, clone)
  })
  return clone
}

let clone = realDeepClone(obj)