Object.setPrototypeOf()

const obj = {};
const parent = { foo: "bar" };

console.log(obj.foo);
// : undefined

Object.setPrototypeOf(obj, parent);

console.log(obj.foo);
// : "bar"

Object.setPrototypeOf(obj, prototype)

Object.isExtensible(Object.prototype); // true
Object.setPrototypeOf(Object.prototype, {}); // TypeError:  '#<Object>' 
Object.setPrototypeOf(Object.prototype, null); //  `Object.prototype`  `null` 

class Human {}
class SuperHero extends Human {}

const superMan = new SuperHero();

function Human(name, level) {
  this.name = name;
  this.level = level;
}

function SuperHero(name, level) {
  Human.call(this, name, level);
}

Object.setPrototypeOf(SuperHero.prototype, Human.prototype);

// `SuperHero.prototype`  `[[Prototype]]`  `Human.prototype` 
// 

Human.prototype.speak = function () {
  return `${this.name} says hello.`;
};

SuperHero.prototype.fly = function () {
  return `${this.name} is flying.`;
};

const superMan = new SuperHero("Clark Kent", 1);

console.log(superMan.fly());
console.log(superMan.speak());

class Human {}
class SuperHero {}

// 
Object.setPrototypeOf(SuperHero.prototype, Human.prototype);

// 
Object.setPrototypeOf(SuperHero, Human);

const superMan = new SuperHero();