[v9] Migration guide

[krispya]

The WIP migration guide is here: https://github.com/pmndrs/react-three-fiber/blob/v9/docs/tutorials/v9-migration-guide.mdx

If you have questions you want to see answered in a migration guide feel free to post them here!

[SelfhostedPro]

I had some trouble fully understanding how to extend. The docs are a bit too concise. I think it would be a good idea to separately define how things were before and how things should be now.

In the meantime if someone is looking for how, I've copied one of the examples here and noted the relevant files: https://github.com/SelfhostedPro/react-three-fiber-next-15-typescript

[RektTillNoon]

Any reason why we can't just run codemod to update most of the library?

npx codemod@latest react/19/migration-recipe

[RektTillNoon]

Also is this upgrade to v9 being actively worked on?

[krispya]

The only breaking changes are TypeScript related.