Typescript return typeof this

user_1489183 0
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I'm looking for the correct way of returning the type of this from an implementation of an abstract method. Like the self in PHP.

I've tried this very basic example:

abstract class Listable {
  public abstract list(): (typeof this)[]; //bad syntax
}

class SomeList extends Listable {
  public list(): SomeList[] {
    return [new SomeList, new SomeList, new SomeList];
  }
}

This is - however - bad syntax. Is there a way to do this?

typescript
1 Answers

You can just use a this type as follows:

abstract class Listable {
  public abstract list(): this[];
}

class SomeList extends Listable {
  public list(): this[] {
    return [this];
  }
}

const l = new SomeList().list(); // type of l is SomeList[]
user_35589600
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