fix: don't turn component instances stored in $state into state proxies by 61021 · Pull Request #18646 · sveltejs/svelte

61021 · 2026-08-15T18:03:54Z

When bind:this={components.first} writes into a $state object, the proxy wraps the component's exports object like any other POJO. Everything read through it then gets deep-proxied too, but only in prod: dev codegen exposes exports as getters, which the proxy's get trap doesn't wrap (it only creates sources for writable data properties), while prod emits plain data properties. So components.first.myArr is the raw array in dev and a proxy in prod. That's the divergence in the issue.

This PR marks the exports object with a symbol in pop() (and on the _mount fallback for components without exports), and proxy(...) now returns marked objects as-is. Component instances are opaque handles; DOM elements already escape proxying through the prototype check, and instances were only caught because they happen to be plain objects. Reassignment stays reactive since the property source on the containing object is untouched.

Side effect worth noting: unmount(components.first) now finds the instance in mounted_components instead of receiving a proxy, which is the exact case the state_proxy_unmount warning (#16747) was added for.

Test plan

new bind-this-component-in-state sample: instance.get_first().myArr === items fails on main in prod mode, passes with the fix
new bind-this-component-in-state-dev sample pins dev to the same behavior
pnpm test runtime-runes runtime-legacy signals: 6070 passed
pnpm check and pnpm lint clean

Co-authored-by: Claude <noreply@anthropic.com>

pkg-svelte-dev · 2026-08-15T18:03:57Z

Install the latest version of svelte from f3d62b3:

pnpm add https://pkg.svelte.dev/svelte/c/f3d62b3795cfa19b63d249c5114c155cf576f90a

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/svelte/pr/18646

Note

This PR is from a fork. A maintainer must approve approve each commit before it can be built and installed.

changeset-bot · 2026-08-15T18:03:58Z

🦋 Changeset detected

Latest commit: f3d62b3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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dummdidumm · 2026-08-19T21:11:17Z

In #16747 Rich said that more handling is unnecessary because it's rare/unnecessary to do this - but I also sympathize with the solution right here because it shows it's not just with direct $state usage (and will also allow us to remove that warning). Will discuss with the team.

dummdidumm

thank you!

vercel

Additional Suggestion:

The lifecycle_double_unmount() DEV warning was collaterally removed from unmount(), so unmounting a never-mounted component no longer warns developers.

@const

This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## svelte@5.57.0 ### Minor Changes - feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and `Sha256Source` from `svelte/server` ([#18648](#18648)) - feat: add `has` function to `createContext` ([#18472](#18472)) - feat: support `defaultValue` on `<select>` ([#18591](#18591)) - feat: add getOrInsert/getOrInsertComputed to SvelteMap ([#18728](#18728)) ### Patch Changes - fix: block template store subscriptions on the promise that assigns the store ([#18582](#18582)) - fix: route $derived teardown errors through invoke_error_boundary ([#18486](#18486)) - fix: track SvelteDate snapshots in reactions ([#18700](#18700)) - fix: remove `<svelte:head>` anchors on unmount ([#18697](#18697)) - fix: warn on undeclared shorthand event handlers on `<svelte:window>`, `<svelte:document>` and `<svelte:body>` ([#18480](#18480)) - perf: reuse the cached value in the `<option>`/`<select>` value guard ([#18713](#18713)) - fix: prevent malformed AST output for `<select>` with static `value` attribute ([#18449](#18449)) - fix: apply ownership mutation ignores to binding assignments ([#18718](#18718)) - fix: prevent onoutroend from firing twice when compilerOptions.hmr is true ([#18655](#18655)) - fix: preserve whitespace after inline elements when printing ([#18685](#18685)) - perf: fold SSR block-open markers into the branch's first push ([#18712](#18712)) - fix: run `onDestroy` callbacks when a server render throws ([#18585](#18585)) - fix: report `derived_invalid_export` for `export let x = $derived(...)` in runes mode ([#18692](#18692)) - fix: never apply class hash to elements inside `<svelte:head>` ([#18160](#18160)) - fix: keep `defaultChecked` on hydrated radio inputs with spread attributes ([#18701](#18701)) - fix: accept `onfocusin`/`onfocusout` in `a11y_mouse_events_have_key_events` ([#18689](#18689)) - perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement ordering ([#18602](#18602)) - fix: distinct memoizer on style/class directives ([#18466](#18466)) - fix: measure nested transitions before applying their starting styles ([#18647](#18647)) - fix: don't turn component instances stored in `$state` into state proxies ([#18646](#18646)) - perf: emit `$.only_child` for elements with a single child ([#18717](#18717)) - fix: omit `bind:focused` from SSR output (it has no HTML attribute) ([#18724](#18724)) - fix: more robust rendering of Svelte custom element slots ([#18710](#18710)) - perf: optimize simple object destructuring in `@const` tags ([#18390](#18390)) - fix: properly apply static textarea value attribute during CSR ([#18727](#18727)) - fix: end a restored reaction context at the end of its synchronous segment ([#18694](#18694)) - fix: keep the dependencies of a reaction that throws, so deriveds it read are neither leaked nor stuck in their error ([#18703](#18703)) - fix: don't resurrect outroing elements when an ancestor block is paused and resumed ([#18431](#18431)) - perf: use `$.comment()` for single-comment templates ([#18714](#18714)) - chore: move `@types/trusted-types` to devDependencies ([#18730](#18730)) - perf: store setters cache as `Set` instead of `Array` ([#18251](#18251)) - fix: transform derived assignments and select function bindings correctly during server-side rendering ([#18669](#18669)) - fix: keep boolean attributes with an empty string value when rendering attribute objects on the server ([#18721](#18721)) - fix: sync `SvelteURL` port signal when the protocol setter clears the port ([#18705](#18705)) - fix: block declaration tags and `{@const}` on async values read inside closures ([#18533](#18533)) - fix: avoid css tree-shaking for exported Snippet ([#18540](#18540)) - perf: treat `<img loading>` as a static element again ([#18711](#18711)) - fix: prevent `selectedcontent` mutation from changing the selected option ([#18495](#18495)) - fix: avoid `NaN` keyframe values in `slide` transition for elements without a layout box ([#18430](#18430)) - fix: preserve line feed character references in attribute values ([#18691](#18691)) - fix: decode uppercase-`X` hex numeric character references (`&#X...;`) ([#18708](#18708)) - chore: clarify when `$effect.pre` runs relative to DOM updates ([#18534](#18534)) - fix: scope SSR boundary failed snippets to their boundary ([#18593](#18593)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

@const

This PR contains the following updates: | Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---| | [svelte](https://svelte.dev) ([source](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte)) | [`5.56.10` → `5.57.0`](https://renovatebot.com/diffs/npm/svelte/5.56.10/5.57.0) | ![age](https://developer.mend.io/api/mc/badges/age/npm/svelte/5.57.0?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/svelte/5.56.10/5.57.0?slim=true) | --- ### Release Notes <details> <summary>sveltejs/svelte (svelte)</summary> ### [`v5.57.0`](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5570) [Compare Source](https://github.com/sveltejs/svelte/compare/svelte@5.56.10...svelte@5.57.0) ##### Minor Changes - feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and `Sha256Source` from `svelte/server` ([#18648](sveltejs/svelte#18648)) - feat: add `has` function to `createContext` ([#18472](sveltejs/svelte#18472)) - feat: support `defaultValue` on `<select>` ([#18591](sveltejs/svelte#18591)) - feat: add getOrInsert/getOrInsertComputed to SvelteMap ([#18728](sveltejs/svelte#18728)) ##### Patch Changes - fix: block template store subscriptions on the promise that assigns the store ([#18582](sveltejs/svelte#18582)) - fix: route $derived teardown errors through invoke\_error\_boundary ([#18486](sveltejs/svelte#18486)) - fix: track SvelteDate snapshots in reactions ([#18700](sveltejs/svelte#18700)) - fix: remove `<svelte:head>` anchors on unmount ([#18697](sveltejs/svelte#18697)) - fix: warn on undeclared shorthand event handlers on `<svelte:window>`, `<svelte:document>` and `<svelte:body>` ([#18480](sveltejs/svelte#18480)) - perf: reuse the cached value in the `<option>`/`<select>` value guard ([#18713](sveltejs/svelte#18713)) - fix: prevent malformed AST output for `<select>` with static `value` attribute ([#18449](sveltejs/svelte#18449)) - fix: apply ownership mutation ignores to binding assignments ([#18718](sveltejs/svelte#18718)) - fix: prevent onoutroend from firing twice when compilerOptions.hmr is true ([#18655](sveltejs/svelte#18655)) - fix: preserve whitespace after inline elements when printing ([#18685](sveltejs/svelte#18685)) - perf: fold SSR block-open markers into the branch's first push ([#18712](sveltejs/svelte#18712)) - fix: run `onDestroy` callbacks when a server render throws ([#18585](sveltejs/svelte#18585)) - fix: report `derived_invalid_export` for `export let x = $derived(...)` in runes mode ([#18692](sveltejs/svelte#18692)) - fix: never apply class hash to elements inside `<svelte:head>` ([#18160](sveltejs/svelte#18160)) - fix: keep `defaultChecked` on hydrated radio inputs with spread attributes ([#18701](sveltejs/svelte#18701)) - fix: accept `onfocusin`/`onfocusout` in `a11y_mouse_events_have_key_events` ([#18689](sveltejs/svelte#18689)) - perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement ordering ([#18602](sveltejs/svelte#18602)) - fix: distinct memoizer on style/class directives ([#18466](sveltejs/svelte#18466)) - fix: measure nested transitions before applying their starting styles ([#18647](sveltejs/svelte#18647)) - fix: don't turn component instances stored in `$state` into state proxies ([#18646](sveltejs/svelte#18646)) - perf: emit `$.only_child` for elements with a single child ([#18717](sveltejs/svelte#18717)) - fix: omit `bind:focused` from SSR output (it has no HTML attribute) ([#18724](sveltejs/svelte#18724)) - fix: more robust rendering of Svelte custom element slots ([#18710](sveltejs/svelte#18710)) - perf: optimize simple object destructuring in `@const` tags ([#18390](sveltejs/svelte#18390)) - fix: properly apply static textarea value attribute during CSR ([#18727](sveltejs/svelte#18727)) - fix: end a restored reaction context at the end of its synchronous segment ([#18694](sveltejs/svelte#18694)) - fix: keep the dependencies of a reaction that throws, so deriveds it read are neither leaked nor stuck in their error ([#18703](sveltejs/svelte#18703)) - fix: don't resurrect outroing elements when an ancestor block is paused and resumed ([#18431](sveltejs/svelte#18431)) - perf: use `$.comment()` for single-comment templates ([#18714](sveltejs/svelte#18714)) - chore: move `@types/trusted-types` to devDependencies ([#18730](sveltejs/svelte#18730)) - perf: store setters cache as `Set` instead of `Array` ([#18251](sveltejs/svelte#18251)) - fix: transform derived assignments and select function bindings correctly during server-side rendering ([#18669](sveltejs/svelte#18669)) - fix: keep boolean attributes with an empty string value when rendering attribute objects on the server ([#18721](sveltejs/svelte#18721)) - fix: sync `SvelteURL` port signal when the protocol setter clears the port ([#18705](sveltejs/svelte#18705)) - fix: block declaration tags and `{@const}` on async values read inside closures ([#18533](sveltejs/svelte#18533)) - fix: avoid css tree-shaking for exported Snippet ([#18540](sveltejs/svelte#18540)) - perf: treat `<img loading>` as a static element again ([#18711](sveltejs/svelte#18711)) - fix: prevent `selectedcontent` mutation from changing the selected option ([#18495](sveltejs/svelte#18495)) - fix: avoid `NaN` keyframe values in `slide` transition for elements without a layout box ([#18430](sveltejs/svelte#18430)) - fix: preserve line feed character references in attribute values ([#18691](sveltejs/svelte#18691)) - fix: decode uppercase-`X` hex numeric character references (`&#X...;`) ([#18708](sveltejs/svelte#18708)) - chore: clarify when `$effect.pre` runs relative to DOM updates ([#18534](sveltejs/svelte#18534)) - fix: scope SSR boundary failed snippets to their boundary ([#18593](sveltejs/svelte#18593)) </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. 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@const

##### [v5.57.0](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5570) ##### Minor Changes - feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and `Sha256Source` from `svelte/server` ([#18648](sveltejs/svelte#18648)) - feat: add `has` function to `createContext` ([#18472](sveltejs/svelte#18472)) - feat: support `defaultValue` on `<select>` ([#18591](sveltejs/svelte#18591)) - feat: add getOrInsert/getOrInsertComputed to SvelteMap ([#18728](sveltejs/svelte#18728)) ##### Patch Changes - fix: block template store subscriptions on the promise that assigns the store ([#18582](sveltejs/svelte#18582)) - fix: route $derived teardown errors through invoke\_error\_boundary ([#18486](sveltejs/svelte#18486)) - fix: track SvelteDate snapshots in reactions ([#18700](sveltejs/svelte#18700)) - fix: remove `<svelte:head>` anchors on unmount ([#18697](sveltejs/svelte#18697)) - fix: warn on undeclared shorthand event handlers on `<svelte:window>`, `<svelte:document>` and `<svelte:body>` ([#18480](sveltejs/svelte#18480)) - perf: reuse the cached value in the `<option>`/`<select>` value guard ([#18713](sveltejs/svelte#18713)) - fix: prevent malformed AST output for `<select>` with static `value` attribute ([#18449](sveltejs/svelte#18449)) - fix: apply ownership mutation ignores to binding assignments ([#18718](sveltejs/svelte#18718)) - fix: prevent onoutroend from firing twice when compilerOptions.hmr is true ([#18655](sveltejs/svelte#18655)) - fix: preserve whitespace after inline elements when printing ([#18685](sveltejs/svelte#18685)) - perf: fold SSR block-open markers into the branch's first push ([#18712](sveltejs/svelte#18712)) - fix: run `onDestroy` callbacks when a server render throws ([#18585](sveltejs/svelte#18585)) - fix: report `derived_invalid_export` for `export let x = $derived(...)` in runes mode ([#18692](sveltejs/svelte#18692)) - fix: never apply class hash to elements inside `<svelte:head>` ([#18160](sveltejs/svelte#18160)) - fix: keep `defaultChecked` on hydrated radio inputs with spread attributes ([#18701](sveltejs/svelte#18701)) - fix: accept `onfocusin`/`onfocusout` in `a11y_mouse_events_have_key_events` ([#18689](sveltejs/svelte#18689)) - perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement ordering ([#18602](sveltejs/svelte#18602)) - fix: distinct memoizer on style/class directives ([#18466](sveltejs/svelte#18466)) - fix: measure nested transitions before applying their starting styles ([#18647](sveltejs/svelte#18647)) - fix: don't turn component instances stored in `$state` into state proxies ([#18646](sveltejs/svelte#18646)) - perf: emit `$.only_child` for elements with a single child ([#18717](sveltejs/svelte#18717)) - fix: omit `bind:focused` from SSR output (it has no HTML attribute) ([#18724](sveltejs/svelte#18724)) - fix: more robust rendering of Svelte custom element slots ([#18710](sveltejs/svelte#18710)) - perf: optimize simple object destructuring in `@const` tags ([#18390](sveltejs/svelte#18390)) - fix: properly apply static textarea value attribute during CSR ([#18727](sveltejs/svelte#18727)) - fix: end a restored reaction context at the end of its synchronous segment ([#18694](sveltejs/svelte#18694)) - fix: keep the dependencies of a reaction that throws, so deriveds it read are neither leaked nor stuck in their error ([#18703](sveltejs/svelte#18703)) - fix: don't resurrect outroing elements when an ancestor block is paused and resumed ([#18431](sveltejs/svelte#18431)) - perf: use `$.comment()` for single-comment templates ([#18714](sveltejs/svelte#18714)) - chore: move `@types/trusted-types` to devDependencies ([#18730](sveltejs/svelte#18730)) - perf: store setters cache as `Set` instead of `Array` ([#18251](sveltejs/svelte#18251)) - fix: transform derived assignments and select function bindings correctly during server-side rendering ([#18669](sveltejs/svelte#18669)) - fix: keep boolean attributes with an empty string value when rendering attribute objects on the server ([#18721](sveltejs/svelte#18721)) - fix: sync `SvelteURL` port signal when the protocol setter clears the port ([#18705](sveltejs/svelte#18705)) - fix: block declaration tags and `{@const}` on async values read inside closures ([#18533](sveltejs/svelte#18533)) - fix: avoid css tree-shaking for exported Snippet ([#18540](sveltejs/svelte#18540)) - perf: treat `<img loading>` as a static element again ([#18711](sveltejs/svelte#18711)) - fix: prevent `selectedcontent` mutation from changing the selected option ([#18495](sveltejs/svelte#18495)) - fix: avoid `NaN` keyframe values in `slide` transition for elements without a layout box ([#18430](sveltejs/svelte#18430)) - fix: preserve line feed character references in attribute values ([#18691](sveltejs/svelte#18691)) - fix: decode uppercase-`X` hex numeric character references (`&#X...;`) ([#18708](sveltejs/svelte#18708)) - chore: clarify when `$effect.pre` runs relative to DOM updates ([#18534](sveltejs/svelte#18534)) - fix: scope SSR boundary failed snippets to their boundary ([#18593](sveltejs/svelte#18593))

@const

##### [v5.57.0](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5570) ##### Minor Changes - feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and `Sha256Source` from `svelte/server` ([#18648](sveltejs/svelte#18648)) - feat: add `has` function to `createContext` ([#18472](sveltejs/svelte#18472)) - feat: support `defaultValue` on `<select>` ([#18591](sveltejs/svelte#18591)) - feat: add getOrInsert/getOrInsertComputed to SvelteMap ([#18728](sveltejs/svelte#18728)) ##### Patch Changes - fix: block template store subscriptions on the promise that assigns the store ([#18582](sveltejs/svelte#18582)) - fix: route $derived teardown errors through invoke\_error\_boundary ([#18486](sveltejs/svelte#18486)) - fix: track SvelteDate snapshots in reactions ([#18700](sveltejs/svelte#18700)) - fix: remove `<svelte:head>` anchors on unmount ([#18697](sveltejs/svelte#18697)) - fix: warn on undeclared shorthand event handlers on `<svelte:window>`, `<svelte:document>` and `<svelte:body>` ([#18480](sveltejs/svelte#18480)) - perf: reuse the cached value in the `<option>`/`<select>` value guard ([#18713](sveltejs/svelte#18713)) - fix: prevent malformed AST output for `<select>` with static `value` attribute ([#18449](sveltejs/svelte#18449)) - fix: apply ownership mutation ignores to binding assignments ([#18718](sveltejs/svelte#18718)) - fix: prevent onoutroend from firing twice when compilerOptions.hmr is true ([#18655](sveltejs/svelte#18655)) - fix: preserve whitespace after inline elements when printing ([#18685](sveltejs/svelte#18685)) - perf: fold SSR block-open markers into the branch's first push ([#18712](sveltejs/svelte#18712)) - fix: run `onDestroy` callbacks when a server render throws ([#18585](sveltejs/svelte#18585)) - fix: report `derived_invalid_export` for `export let x = $derived(...)` in runes mode ([#18692](sveltejs/svelte#18692)) - fix: never apply class hash to elements inside `<svelte:head>` ([#18160](sveltejs/svelte#18160)) - fix: keep `defaultChecked` on hydrated radio inputs with spread attributes ([#18701](sveltejs/svelte#18701)) - fix: accept `onfocusin`/`onfocusout` in `a11y_mouse_events_have_key_events` ([#18689](sveltejs/svelte#18689)) - perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement ordering ([#18602](sveltejs/svelte#18602)) - fix: distinct memoizer on style/class directives ([#18466](sveltejs/svelte#18466)) - fix: measure nested transitions before applying their starting styles ([#18647](sveltejs/svelte#18647)) - fix: don't turn component instances stored in `$state` into state proxies ([#18646](sveltejs/svelte#18646)) - perf: emit `$.only_child` for elements with a single child ([#18717](sveltejs/svelte#18717)) - fix: omit `bind:focused` from SSR output (it has no HTML attribute) ([#18724](sveltejs/svelte#18724)) - fix: more robust rendering of Svelte custom element slots ([#18710](sveltejs/svelte#18710)) - perf: optimize simple object destructuring in `@const` tags ([#18390](sveltejs/svelte#18390)) - fix: properly apply static textarea value attribute during CSR ([#18727](sveltejs/svelte#18727)) - fix: end a restored reaction context at the end of its synchronous segment ([#18694](sveltejs/svelte#18694)) - fix: keep the dependencies of a reaction that throws, so deriveds it read are neither leaked nor stuck in their error ([#18703](sveltejs/svelte#18703)) - fix: don't resurrect outroing elements when an ancestor block is paused and resumed ([#18431](sveltejs/svelte#18431)) - perf: use `$.comment()` for single-comment templates ([#18714](sveltejs/svelte#18714)) - chore: move `@types/trusted-types` to devDependencies ([#18730](sveltejs/svelte#18730)) - perf: store setters cache as `Set` instead of `Array` ([#18251](sveltejs/svelte#18251)) - fix: transform derived assignments and select function bindings correctly during server-side rendering ([#18669](sveltejs/svelte#18669)) - fix: keep boolean attributes with an empty string value when rendering attribute objects on the server ([#18721](sveltejs/svelte#18721)) - fix: sync `SvelteURL` port signal when the protocol setter clears the port ([#18705](sveltejs/svelte#18705)) - fix: block declaration tags and `{@const}` on async values read inside closures ([#18533](sveltejs/svelte#18533)) - fix: avoid css tree-shaking for exported Snippet ([#18540](sveltejs/svelte#18540)) - perf: treat `<img loading>` as a static element again ([#18711](sveltejs/svelte#18711)) - fix: prevent `selectedcontent` mutation from changing the selected option ([#18495](sveltejs/svelte#18495)) - fix: avoid `NaN` keyframe values in `slide` transition for elements without a layout box ([#18430](sveltejs/svelte#18430)) - fix: preserve line feed character references in attribute values ([#18691](sveltejs/svelte#18691)) - fix: decode uppercase-`X` hex numeric character references (`&#X...;`) ([#18708](sveltejs/svelte#18708)) - chore: clarify when `$effect.pre` runs relative to DOM updates ([#18534](sveltejs/svelte#18534)) - fix: scope SSR boundary failed snippets to their boundary ([#18593](sveltejs/svelte#18593))

@const

##### [v5.57.0](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5570) ##### Minor Changes - feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and `Sha256Source` from `svelte/server` ([#18648](sveltejs/svelte#18648)) - feat: add `has` function to `createContext` ([#18472](sveltejs/svelte#18472)) - feat: support `defaultValue` on `<select>` ([#18591](sveltejs/svelte#18591)) - feat: add getOrInsert/getOrInsertComputed to SvelteMap ([#18728](sveltejs/svelte#18728)) ##### Patch Changes - fix: block template store subscriptions on the promise that assigns the store ([#18582](sveltejs/svelte#18582)) - fix: route $derived teardown errors through invoke\_error\_boundary ([#18486](sveltejs/svelte#18486)) - fix: track SvelteDate snapshots in reactions ([#18700](sveltejs/svelte#18700)) - fix: remove `<svelte:head>` anchors on unmount ([#18697](sveltejs/svelte#18697)) - fix: warn on undeclared shorthand event handlers on `<svelte:window>`, `<svelte:document>` and `<svelte:body>` ([#18480](sveltejs/svelte#18480)) - perf: reuse the cached value in the `<option>`/`<select>` value guard ([#18713](sveltejs/svelte#18713)) - fix: prevent malformed AST output for `<select>` with static `value` attribute ([#18449](sveltejs/svelte#18449)) - fix: apply ownership mutation ignores to binding assignments ([#18718](sveltejs/svelte#18718)) - fix: prevent onoutroend from firing twice when compilerOptions.hmr is true ([#18655](sveltejs/svelte#18655)) - fix: preserve whitespace after inline elements when printing ([#18685](sveltejs/svelte#18685)) - perf: fold SSR block-open markers into the branch's first push ([#18712](sveltejs/svelte#18712)) - fix: run `onDestroy` callbacks when a server render throws ([#18585](sveltejs/svelte#18585)) - fix: report `derived_invalid_export` for `export let x = $derived(...)` in runes mode ([#18692](sveltejs/svelte#18692)) - fix: never apply class hash to elements inside `<svelte:head>` ([#18160](sveltejs/svelte#18160)) - fix: keep `defaultChecked` on hydrated radio inputs with spread attributes ([#18701](sveltejs/svelte#18701)) - fix: accept `onfocusin`/`onfocusout` in `a11y_mouse_events_have_key_events` ([#18689](sveltejs/svelte#18689)) - perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement ordering ([#18602](sveltejs/svelte#18602)) - fix: distinct memoizer on style/class directives ([#18466](sveltejs/svelte#18466)) - fix: measure nested transitions before applying their starting styles ([#18647](sveltejs/svelte#18647)) - fix: don't turn component instances stored in `$state` into state proxies ([#18646](sveltejs/svelte#18646)) - perf: emit `$.only_child` for elements with a single child ([#18717](sveltejs/svelte#18717)) - fix: omit `bind:focused` from SSR output (it has no HTML attribute) ([#18724](sveltejs/svelte#18724)) - fix: more robust rendering of Svelte custom element slots ([#18710](sveltejs/svelte#18710)) - perf: optimize simple object destructuring in `@const` tags ([#18390](sveltejs/svelte#18390)) - fix: properly apply static textarea value attribute during CSR ([#18727](sveltejs/svelte#18727)) - fix: end a restored reaction context at the end of its synchronous segment ([#18694](sveltejs/svelte#18694)) - fix: keep the dependencies of a reaction that throws, so deriveds it read are neither leaked nor stuck in their error ([#18703](sveltejs/svelte#18703)) - fix: don't resurrect outroing elements when an ancestor block is paused and resumed ([#18431](sveltejs/svelte#18431)) - perf: use `$.comment()` for single-comment templates ([#18714](sveltejs/svelte#18714)) - chore: move `@types/trusted-types` to devDependencies ([#18730](sveltejs/svelte#18730)) - perf: store setters cache as `Set` instead of `Array` ([#18251](sveltejs/svelte#18251)) - fix: transform derived assignments and select function bindings correctly during server-side rendering ([#18669](sveltejs/svelte#18669)) - fix: keep boolean attributes with an empty string value when rendering attribute objects on the server ([#18721](sveltejs/svelte#18721)) - fix: sync `SvelteURL` port signal when the protocol setter clears the port ([#18705](sveltejs/svelte#18705)) - fix: block declaration tags and `{@const}` on async values read inside closures ([#18533](sveltejs/svelte#18533)) - fix: avoid css tree-shaking for exported Snippet ([#18540](sveltejs/svelte#18540)) - perf: treat `<img loading>` as a static element again ([#18711](sveltejs/svelte#18711)) - fix: prevent `selectedcontent` mutation from changing the selected option ([#18495](sveltejs/svelte#18495)) - fix: avoid `NaN` keyframe values in `slide` transition for elements without a layout box ([#18430](sveltejs/svelte#18430)) - fix: preserve line feed character references in attribute values ([#18691](sveltejs/svelte#18691)) - fix: decode uppercase-`X` hex numeric character references (`&#X...;`) ([#18708](sveltejs/svelte#18708)) - chore: clarify when `$effect.pre` runs relative to DOM updates ([#18534](sveltejs/svelte#18534)) - fix: scope SSR boundary failed snippets to their boundary ([#18593](sveltejs/svelte#18593))

@const

##### [v5.57.0](https://github.com/sveltejs/svelte/blob/HEAD/packages/svelte/CHANGELOG.md#5570) ##### Minor Changes - feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and `Sha256Source` from `svelte/server` ([#18648](sveltejs/svelte#18648)) - feat: add `has` function to `createContext` ([#18472](sveltejs/svelte#18472)) - feat: support `defaultValue` on `<select>` ([#18591](sveltejs/svelte#18591)) - feat: add getOrInsert/getOrInsertComputed to SvelteMap ([#18728](sveltejs/svelte#18728)) ##### Patch Changes - fix: block template store subscriptions on the promise that assigns the store ([#18582](sveltejs/svelte#18582)) - fix: route $derived teardown errors through invoke\_error\_boundary ([#18486](sveltejs/svelte#18486)) - fix: track SvelteDate snapshots in reactions ([#18700](sveltejs/svelte#18700)) - fix: remove `<svelte:head>` anchors on unmount ([#18697](sveltejs/svelte#18697)) - fix: warn on undeclared shorthand event handlers on `<svelte:window>`, `<svelte:document>` and `<svelte:body>` ([#18480](sveltejs/svelte#18480)) - perf: reuse the cached value in the `<option>`/`<select>` value guard ([#18713](sveltejs/svelte#18713)) - fix: prevent malformed AST output for `<select>` with static `value` attribute ([#18449](sveltejs/svelte#18449)) - fix: apply ownership mutation ignores to binding assignments ([#18718](sveltejs/svelte#18718)) - fix: prevent onoutroend from firing twice when compilerOptions.hmr is true ([#18655](sveltejs/svelte#18655)) - fix: preserve whitespace after inline elements when printing ([#18685](sveltejs/svelte#18685)) - perf: fold SSR block-open markers into the branch's first push ([#18712](sveltejs/svelte#18712)) - fix: run `onDestroy` callbacks when a server render throws ([#18585](sveltejs/svelte#18585)) - fix: report `derived_invalid_export` for `export let x = $derived(...)` in runes mode ([#18692](sveltejs/svelte#18692)) - fix: never apply class hash to elements inside `<svelte:head>` ([#18160](sveltejs/svelte#18160)) - fix: keep `defaultChecked` on hydrated radio inputs with spread attributes ([#18701](sveltejs/svelte#18701)) - fix: accept `onfocusin`/`onfocusout` in `a11y_mouse_events_have_key_events` ([#18689](sveltejs/svelte#18689)) - perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement ordering ([#18602](sveltejs/svelte#18602)) - fix: distinct memoizer on style/class directives ([#18466](sveltejs/svelte#18466)) - fix: measure nested transitions before applying their starting styles ([#18647](sveltejs/svelte#18647)) - fix: don't turn component instances stored in `$state` into state proxies ([#18646](sveltejs/svelte#18646)) - perf: emit `$.only_child` for elements with a single child ([#18717](sveltejs/svelte#18717)) - fix: omit `bind:focused` from SSR output (it has no HTML attribute) ([#18724](sveltejs/svelte#18724)) - fix: more robust rendering of Svelte custom element slots ([#18710](sveltejs/svelte#18710)) - perf: optimize simple object destructuring in `@const` tags ([#18390](sveltejs/svelte#18390)) - fix: properly apply static textarea value attribute during CSR ([#18727](sveltejs/svelte#18727)) - fix: end a restored reaction context at the end of its synchronous segment ([#18694](sveltejs/svelte#18694)) - fix: keep the dependencies of a reaction that throws, so deriveds it read are neither leaked nor stuck in their error ([#18703](sveltejs/svelte#18703)) - fix: don't resurrect outroing elements when an ancestor block is paused and resumed ([#18431](sveltejs/svelte#18431)) - perf: use `$.comment()` for single-comment templates ([#18714](sveltejs/svelte#18714)) - chore: move `@types/trusted-types` to devDependencies ([#18730](sveltejs/svelte#18730)) - perf: store setters cache as `Set` instead of `Array` ([#18251](sveltejs/svelte#18251)) - fix: transform derived assignments and select function bindings correctly during server-side rendering ([#18669](sveltejs/svelte#18669)) - fix: keep boolean attributes with an empty string value when rendering attribute objects on the server ([#18721](sveltejs/svelte#18721)) - fix: sync `SvelteURL` port signal when the protocol setter clears the port ([#18705](sveltejs/svelte#18705)) - fix: block declaration tags and `{@const}` on async values read inside closures ([#18533](sveltejs/svelte#18533)) - fix: avoid css tree-shaking for exported Snippet ([#18540](sveltejs/svelte#18540)) - perf: treat `<img loading>` as a static element again ([#18711](sveltejs/svelte#18711)) - fix: prevent `selectedcontent` mutation from changing the selected option ([#18495](sveltejs/svelte#18495)) - fix: avoid `NaN` keyframe values in `slide` transition for elements without a layout box ([#18430](sveltejs/svelte#18430)) - fix: preserve line feed character references in attribute values ([#18691](sveltejs/svelte#18691)) - fix: decode uppercase-`X` hex numeric character references (`&#X...;`) ([#18708](sveltejs/svelte#18708)) - chore: clarify when `$effect.pre` runs relative to DOM updates ([#18534](sveltejs/svelte#18534)) - fix: scope SSR boundary failed snippets to their boundary ([#18593](sveltejs/svelte#18593)) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

fix: don't turn component instances stored in $state into state proxies

229cd34

Co-authored-by: Claude <noreply@anthropic.com>

dummdidumm and others added 3 commits August 21, 2026 10:46

tweak

364e317

remove state_proxy_unmount warning as we now handle this

8521207

Merge branch 'main' into fix/state-proxy-component-instance

72259f9

dummdidumm reviewed Aug 21, 2026

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dummdidumm approved these changes Aug 21, 2026

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dummdidumm merged commit 2d2e5df into sveltejs:main Aug 21, 2026
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Version Packages #18682

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chore: upgrade Svelte submodule to 5.57.0 baseballyama/rsvelte#4049

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fix: don't turn component instances stored in $state into state proxies - #18646

fix: don't turn component instances stored in $state into state proxies#18646
dummdidumm merged 6 commits into
sveltejs:mainfrom
61021:fix/state-proxy-component-instance

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61021 commented Aug 15, 2026

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