When extending a Javascript Class, can a parent class specify to use a child level class type

When creating a parent class type, I want to be able to have a number of child types. The parent is constantly remaking itself, and I want the children to be able to remake themselves, instead of being remade as the parent.

Here is an overly simplified example.

class Vector {
   constructor(...c) { this.components = c; }
   add(c) { return new Vector([this.components[0]+c]) }
}
class Vec2 extends Vector {}

In this example, If I make a new Vec2, and use its add method, it will return a new Vector, but I want it to return a new Vec2. How is this done in Javascript?

In other words, I want something like this.

class Vector {
   constructor(...c) { this.components = c; }
   add(c) { return new CurrentClassExtension([this.components[0]+c]) }
   //                  ^^^ How to access the Vector or Vec2 or whatever Class extension here
}
class Vec2 extends Vector {}