gistfile1.txt

abstract class TestParentClass {
    abstract Test(): string;
}

class TestConcreteA {
    Test() {
        return "Called ConcreteA.Test()";
    }
}

class TestConcreteB {
    Test() {
        return "Called ConcreteB.Test()";
    }
}

let testMap = new Map<Number, { new(): TestParentClass }>([
      [0, TestConcreteA],
      [1, TestConcreteB],
]);

let ctor = testMap.get(0);
console.log(new ctor().Test());