The type of snapIndex does not exist in type Swiper

[hiroya-uga]

Check that this is really a bug

• I confirm

Reproduction link

https://codesandbox.io/s/swiper-pagination-react-forked-bdgf3d?file=/src/App.jsx

Bug description

The type of snapIndex does not exist in type Swiper.
In fact, it is any, despite the fact that it is a number.

Developers need to add the following code to global.d.ts to use snapIndex.

declare module 'swiper' {
  interface Swiper {
    snapIndex: number;
  }
}

* It is not present by default. When updateIndex is called, the snapIndex property appears by Object.assign.
https://github.com/nolimits4web/swiper/blob/master/src/core/update/updateActiveIndex.js#L55-L60
* It does not exist in document. But snapIndexChange exists.
https://swiperjs.com/swiper-api#event-snapIndexChange

Expected Behavior

TypeScript knows type of snapIndex as number.

Actual Behavior

TypeScript does not know type of snapIndex as number. It knows as any.

Swiper version

8.1.3

Platform/Target and Browser Versions

macOS 12.3.1 Visual Studio Code latest

Validations

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• Make sure this is a Swiper issue and not a framework-specific issue

Would you like to open a PR for this bug?

• I'm willing to open a PR