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