在打字稿获取类的键

我有一个带有很多方法的类，我们称之为myClass.我这样称呼它:

I have a class with a lot of methods let's call it myClass. I'm calling it like this:

myClass[key]()

是否有办法从键中获取可能的值?我希望像myClass的keyof这样的东西，但是我得到了"myClass指向一个值，但是在这里被用作类型"

Is there a way to get the possible values from key? I hoped for something like keyof myClass, but I got 'myClass refers to a value, but is being used as a type here'

问题可能是，到目前为止，myClass已在.js文件中定义并像这样封装:

The problem is probably that as of now myClass is defined in a .js-file and encapsulated like this:

const myClass = new MyActualClass();
export default myClass

是否可以在不将.js文件转换为打字稿的情况下提取信息，并直接从MyActualClass提取信息?

Is it possible to extract the information without converting the .js file to typescript, and extract the information from MyActualClass directly?