What is the best way to implement a late-binding clone method in TypeScript classes?

Creating a simple Cloneable interface for all my data classes in JavaScript is a straightforward task. However, when it comes to typing it properly in TypeScript, things get a bit more complex.

Currently, I am putting together a solution like this:

class BaseClass implements Cloneable {
  clone() {
    return new (this.constructor as any)(this.data);
  }
}

My goal is for the clone methods of all the sub-classes to return their own type instead of just BaseClass. For example:

class ExampleSubclass extends BaseClass {}

const foo = new ExampleSubclass();
const bar = foo.clone(); // Hoping that `bar` will be of type `ExampleSubclass`, not `BaseClass` or `Cloneable`.

I'm wondering if there is a better way to implement late bindings for this scenario?

Answer №1

I recommend you go ahead and cast it

class MainClass {
  duplicate() {
    return new (this.constructor as any)(this.info) as typeof this;
  }
}

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