why is new^.prototype pass as the proto to Object.create(proto) in this code instead of a regular object or a regular constructor protoype?

Question

 class Derived4 extends Base2 {
   constructor (a) {
      this = Object.create(new^.prototype);
      this.a = a;
    }
  isDerived4() {return true};
}

This is a code from Github site but I don't understand why the first argument of the Object.create(proto) is new^.prototype