Use typescript to dynamically set class property in constructor

Question

I am trying create a typescript class MyClass with instance properties set dynamically in the constructor:

const myInstance = new MyClass(({
  someField: 'foo'
}))

myInstance.someField // typescript should show this as type string

How can I use typescript to create MyClass to show someField as a string property of myInstance?

Can I use generics? Is it at all possible?