class inheritance and type

class.ts

abstract class A<T> {
  a() { return new Map<string, T>(); }
  static b(): number { return 1; }
}
class X<T> extends A<T> {}
class Y extends A<number> {}

new X<number>().a(); // OK
new Y().a(); // OK
X.b(); // OK
Y.b(); // OK

// やりたいこと
const arr /* : 型 */ = [X, Y];
arr[0].b(); // OK

const arr1: (typeof A)[] = [X, Y]; // error: Type 'typeof Y' is not assignable to type 'typeof A'.

const arr2: { new(): A<any> }[] = [X, Y];
arr2[0].b(); // error: Property 'b' does not exist on type 'new () => A<any>'.