What about Svelte 5?

[frederikhors]

After opening #6673 I thought it was time to consider the imminent arrival of Svelte 5.

All news are beautiful explained here: https://svelte-5-preview.vercel.app/docs/introduction.

How do we plan to do it?

I think we can finally close bug like:

• [svelte] "placeholderData: keepPreviousData" doesn't work on reactive queries #5913
• Svelte query - query does not react to changing default options by queryClient.setDefaultOptions in runtime #5855

[lachlancollins]

Everything in Query v5 should continue to work, since Svelte 5 is fully backwards compatible. A future Query version (v6?) will migrate from stores to runes.

[niemyjski]

@lachlancollins is there an issue tracking the runes migration. It's been a huge pain working with derived queries with runes. Like a massive pain. It would be great to start a discussion on this. I feel like this issue works for that.

[lachlancollins]

@lachlancollins is there an issue tracking the runes migration. It's been a huge pain working with derived queries with runes. Like a massive pain. It would be great to start a discussion on this. I feel like this issue works for that.

Hi @niemyjski, see this PR: #6981

[niemyjski]

@lachlancollins I replied here wondering if it's the correct approach and what was left. #6981 (comment)

[lachlancollins]

Hi @frederikhors , I've merged #6981 into https://github.com/TanStack/query/tree/svelte-5-adapter

It's still not ready for release, but I would appreciate more people giving it a try and contributing!

[lachlancollins]

We should probably continue discussion here: #7413