@storybook/nextjs: add support for unstable_getImgProps

[tremby]

Is your feature request related to a problem? Please describe.

I'm using unstable_getImgProps so I can use next/image's features with the <picture>/<source> elements, as explained in the linked comment.

When I try to use this in a story, I currently get an error: next_image__WEBPACK_IMPORTED_MODULE_2__.unstable_getImgProps is not a function.

The same code works fine in my Next application, so that leads me to believe it's a missing mock in @storybook/nextjs.

Describe the solution you'd like

A working Storybook-friendly implementation of unstable_getImgProps.

Describe alternatives you've considered

No response

Are you able to assist to bring the feature to reality?

no

Additional context

I'm aware it's unstable at present so I understand if an implementation won't be added until the upstream feature becomes stable.

[timheerwagen]

I would also be very interested in this feature.

[ygkn]

From Next.js 14.1, unstable_getImgProps is now stable (with renamed as getImageProps).

https://nextjs.org/blog/next-14-1#nextimage-support-for-picture-and-art-direction

[valentinpalkovic]

Since it is stable now, we can consider supporting it in Storybook. Is anyone interested in implementing this functionality? I can definitely support if needed!

[ygkn]

I am interested in implementing this feature. I have created a pull request for it. #25747