Svelte 5, I'm using $state.snapshot but a nested array is still a Proxy

[frederikhors]

Describe the bug

In the reproduction I'm using:

let input = $derived({
    condition: $state.snapshot(condition)
})

but after typing something in the text input in console I get:

{console.log("First, input:", input)}

Do you see the or field? Is still a Proxy.

Is maybe because $effect works on it after the snapshot?

In this case how to go without effect? Can I?

Reproduction

Svelte REPL

Severity

blocking an upgrade

[dummdidumm]

Much simpler reproduction.

In #11180 we decided to not deeply traverse POJOs if we don't encounter a proxy right away, so this is likely a won't fix and you either need to deeply traverse yourself, or do the snapshotting elsewhere.
What's the use case for doing a snapshot here, anyway?

[frederikhors]

What's the use case for doing a snapshot here, anyway?

The usecase is to create a @tanstack/query condition from POJOs.

This is very important.