crud-mixins.ts

export type Constructor<A> = new (...input: any[]) => A;

class BaseEntity {
    id: number;
}

class Account extends BaseEntity {
    name = "Jon"
}

function BaseService<EntityType extends BaseEntity>(Entity: Constructor<EntityType>) {
    return class {
        repository = Entity;
    }
}

function ListService(Base: ReturnType<typeof BaseService>) {
    return class extends Base {
        list() {
            return this.repository // has typeof BaseEntity - great! We do not know yet which service this List mixin will be applied to..
        }
    }
}

class AccountService extends BaseService(Account) {
    test() {
        this.repository // has typeof Account - great!
    }
}

class ListableAccountService extends ListService(BaseService(Account)) {
    test() {
        this.repository // Has typeof BaseEntity - how can I get ListService to understand it should use type that was passed to BaseService????
    }
}