It's currently private, so you could either:

1. Import it from the file
2. Copy-paste it from here:

import type { Readable } from 'svelte/store'; // if you haven't already
type StoresValues<T> =
	T extends Readable<infer U> ? U : { [K in keyof T]: T[K] extends Readable<infer U> ? U : never };

I should have the pull request made in a few minutes.

Yes. I've already copied it over. I just thought this change might be unnecessarily confusing for others migrating to Svelte 5.

This type was never meant to be public - it only was by accident because we didn't know that not having export {} within a module declaration would make all the types public.

Given that this is a type that is easily copied over I'd rather like to keep it that way. Therefore closing - thank you.