constructorToObject.js

function Factory() {
  this.foo = 1;
  this.bar = 'string';
}

let descendant = new Factory();

console.log(Factory.prototype); // {}
console.log(Object.getPrototypeOf(Factory.prototype)); // [Object: null prototype] {}

console.log(
  Object.getPrototypeOf(Factory.prototype) === 
  Object.prototype); // true

console.log(Object.prototype.isPrototypeOf(Factory.prototype)); // true