Object.getOwnPropertyDescriptors

This method returns all properties including getter and setter.

Object.assign shallow copies all the properties excluding getter and setter of the original source object.

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const car = {
  name: 'BMW',
  price: 100000,
  get discount () {
    return this.d
  }
  set discount (x) {
    this.d = x
  }
}

Object.getOwnPropertyDescriptor(car, 'discount') // {get, set, enumerable, configurable}

const assignedCar = Object.assign({}, car)
Object.getOwnPropertyDescriptor(assignedCar, 'discount') // {value: undefined}

const definedCar = Object.defineProperties({}, Object.getOwnPropertyDescriptors(car))
Object.getOwnPropertyDescriptor(definedCar, 'discount') // {get, set, enumerable, configurable}