How to upgrade to v10?
That snippet doesn't work anymore: https://github.com/jaydenseric/graphql-upload#class-graphqlupload

In the `resolve` method, everything is `undefined`:

```js
const { filename, mimetype, createReadStream } = await image

console.log(filename, mimetype, createReadStream)
// undefined undefined undefined
```

How are we supposed to upgrade from v9?

It looks like `image` is now a dedicated class with properties `resolve`, `reject`, `promise` & `file` but according to [the doc](https://github.com/jaydenseric/graphql-upload#class-upload), most of them _should only be utilized by processRequest._.

Using `.promise` seems to solve the issue:

```js
const { filename, mimetype, createReadStream } = await image.promise
```

But `.file` seems to be the resolved promise:

```js
const { filename, mimetype, createReadStream } = image.file
```

Am I right?
Which one is the way to go?