Generic for abstract class

[hasezoey]

I know this has been discussed, but i couldnt find a solution in these issues, so my use case is as following:

abstract class SomeClass {
  public array: object[]

  public async addCar<T extends SomeClass>(this: InstanceType<T> & mongoose.Document, car: object) {
    this.array.push(car);
  }
}

throws an typescript errors because An abstract constructor type can not be assigned to a non-abstract constructor type ts(2344), but InstanceType<T> & mongoose.Document cannot be replaced by something like Function, so i wanted to ask if there is currently a solution to this

using:

• typescript 3.6.2
• node 12.10.0
• @types/node 8.10.53
• target: es6
• lib: esnext

---

PS: sorry if this is an question that should be on SO

[RyanCavanaugh]

This is the intended behavior.

[hasezoey]

This is the intended behavior.

why is this "as intended"? when using an abstract class as an base / "extends" it should work, shouldnt it?

[RyanCavanaugh]

If it was allowed for abstract classes to be assignable to non-abstract construct signatures, then you could instantiate an abstract class through a trivial indirection.

[hasezoey]

is there then a workaround?

[typescript-bot]

This issue has been marked 'Working as Intended' and has seen no recent activity. It has been automatically closed for house-keeping purposes.