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fix: commit a reaction's dependencies even when it throws - #18703
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Fixes #18414 Co-authored-by: Randy Murphy <randalmurphal@users.noreply.github.com>
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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>
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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) |  |  | --- ### 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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##### [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))
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##### [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))
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Sep 7, 2026
##### [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))
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Sep 7, 2026
##### [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>
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Fixes #18414 and a second bug with the same cause.
update_reactioninruntime.jscommits a reaction's dependencies afterfn()returns: it swaps innew_deps, removes stale reactions and registers the reaction into each new dep'sreactions. Whenfn()throws, the whole block is skipped. Two things go wrong from that.A derived that the run read for the first time was already set
CONNECTEDingetand registered itself into its own deps'reactionsduringupdate_derived, but the throwing reaction never registers as its reader. It sits in its deps'reactionswithreactions === nullof its own,remove_reaction's disconnect cascade can never reach it, and it retains itsctx, closures and DOM past component destruction andunmount().A derived that throws during its own run ends up with no dependencies at all. It is not in its sources'
reactions, so a later change to them never re-runs it, and for an unowned derivedupdate_derivedthen marks the error value CLEAN because the derived has no deps. Anything reading it keeps getting the first error forever.The commit block is now
update_dependenciesand thecatchcalls it beforehandle_error, so a failing reaction keeps the deps it read up to the throw. That subscribes it to the inputs that produced the error, and lets the normal disconnect cascade clean up when it is destroyed (Boundary.#handle_errordestroys the failed effect).