打字稿，由给定的字符串强制转换

Question

我有一个由我点击的html元素给出的字符串，并希望将我的对象强制转换为此类型。如何在没有每个字符串的开关案例的情况下做到这一点？

HTML示例

<button type="button" data-type="MyType">cast to MyType</button>
<button type="button" data-type="OtherType">caset to OtherType</button>

打字稿：

///<reference path="jquery.d.ts" />

class MyType {
  // ... some declarations for this class
}

class OtherType {
  // .. some declarations for this class
}

let obj = {
  // compatible declations with one of the classes on top
}

$(document).ready(function(){
  $('button').on('click', function(){
    let typeString = $(this).attr('data-type');

    obj = obj as typeString; // fails
    obj = <typeString>obj // fails



    switch(typeString) {
      case 'MyType':
        obj = obj as MyType;
        break;
      case 'OtherType':
        obj = obj as OtherType;
        breaks;
    }

    // this switch case works but looks too long on working with 200 possible response types



  }
})

我知道对象是什么类型，因为通过调用其余的api来加载单击对象列表。但是如何转换呢？