Declaring a module for a JavaScript Proxy in Typescript

I have something like this:

function createProxy ( configObj ) { //...some code return new Proxy({}, { get: ( target, name ) => { // ...does things return Reflect.get(target, name); }, set: function(target, name, value){ // ...does things return Reflect.set(target, name, value); }, } } 

I have to use "new" keyword for utilizing this function and this is how I use it:

const proxy = new createProxy({ someConfig: string }) proxy.foo = 'bar' 

And I have declared this module like this:

declare module 'create-proxy' { declare class createProxy { constructor(config: { someConfig?: string }) [ index: string ]: string } export { createProxy } } 

And I have no type errors. But...

I have two concerns about this (I am new to Typescript module declaration, my typing can be totally wrong, and that is exactly what I need help about. I have read all the related Typescript docs but couldn't solve it on my own. I just need an experienced person to show me the way),

1- [index: string]: string seems too generic to me and my initial thought was "I think I should define the types of get and set methods of proxy somewhere in my declaration to be able to shape the type of indexable properties. I just feel it needs something more but I am not really experienced declaring modules and I can't point my finger at the problem.

2- What this module exports is actually a function that I need to call with the new keyword but what I am declaring is a class. That is because I have tried declaring it as a function but then I would get the type error saying that this function does not have a constructor (Because I am calling it with the new keyword when I am utilizing the function). I feel this is off, too.

Could you give me a hand here, please? Am I too confused or on the right path?

typescript 3.8.3