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fix: preserve tuple type in $state.snapshot #16864

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Merged
merged 2 commits into from
Oct 1, 2025
+23 −14
Merged

fix: preserve tuple type in $state.snapshot #16864

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9d74ecb
fix: preserve tuple type in `$state.snapshot`
Jungzl Sep 29, 2025
5edc0ab
Update .changeset/lucky-moles-enjoy.md
Rich-Harris Oct 1, 2025
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5 changes: 5 additions & 0 deletions .changeset/lucky-moles-enjoy.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'svelte': patch
---

preserve tuple type in `$state.snapshot`
16 changes: 9 additions & 7 deletions packages/svelte/src/ambient.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -85,13 +85,15 @@ declare namespace $state {
? NonReactive<T>
: T extends { toJSON(): infer R }
? R
: T extends Array<infer U>
? Array<Snapshot<U>>
: T extends object
? T extends { [key: string]: any }
? { [K in keyof T]: Snapshot<T[K]> }
: never
: never;
: T extends readonly unknown[]
? { [K in keyof T]: Snapshot<T[K]> }
: T extends Array<infer U>
? Array<Snapshot<U>>
: T extends object
? T extends { [key: string]: any }
? { [K in keyof T]: Snapshot<T[K]> }
: never
: never;

/**
* Declares state that is _not_ made deeply reactive — instead of mutating it,
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16 changes: 9 additions & 7 deletions packages/svelte/types/index.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3171,13 +3171,15 @@ declare namespace $state {
? NonReactive<T>
: T extends { toJSON(): infer R }
? R
: T extends Array<infer U>
? Array<Snapshot<U>>
: T extends object
? T extends { [key: string]: any }
? { [K in keyof T]: Snapshot<T[K]> }
: never
: never;
: T extends readonly unknown[]
? { [K in keyof T]: Snapshot<T[K]> }
: T extends Array<infer U>
? Array<Snapshot<U>>
: T extends object
? T extends { [key: string]: any }
? { [K in keyof T]: Snapshot<T[K]> }
: never
: never;

/**
* Declares state that is _not_ made deeply reactive — instead of mutating it,
Expand Down
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