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verdict:

Svelte 5.57.0

notable

Note di rilascio

note: la sintesi e le note di rilascio sono in inglese

ok: aggiornamento sicuro

0 breaking changes5 punti chiave

Adds createContext has, SvelteMap getOrInsert and <select> defaultValue, plus many fixes, none breaking.

sintesi · solo dalle note di rilascio · claude-haiku-5-5 · prompt v7

punti chiave

release-notesgithub.com/sveltejs/svelte · 97 righe
  1. ### Minor Changes
  3. - feat: export `RenderOutput`, `SyncRenderOutput`, `Csp` and `Sha256Source` from `svelte/server` ([#18648](https://github.com/sveltejs/svelte/pull/18648))
  5. - feat: add `has` function to `createContext` ([#18472](https://github.com/sveltejs/svelte/pull/18472))
  7. - feat: support `defaultValue` on `<select>` ([#18591](https://github.com/sveltejs/svelte/pull/18591))
  9. - feat: add getOrInsert/getOrInsertComputed to SvelteMap ([#18728](https://github.com/sveltejs/svelte/pull/18728))
  11. ### Patch Changes
  13. - fix: block template store subscriptions on the promise that assigns the store ([#18582](https://github.com/sveltejs/svelte/pull/18582))
  15. - fix: route $derived teardown errors through invoke_error_boundary ([#18486](https://github.com/sveltejs/svelte/pull/18486))
  17. - fix: track SvelteDate snapshots in reactions ([#18700](https://github.com/sveltejs/svelte/pull/18700))
  19. - fix: remove `<svelte:head>` anchors on unmount ([#18697](https://github.com/sveltejs/svelte/pull/18697))
  21. - fix: warn on undeclared shorthand event handlers on `<svelte:window>`, `<svelte:document>` and `<svelte:body>` ([#18480](https://github.com/sveltejs/svelte/pull/18480))
  23. - perf: reuse the cached value in the `<option>`/`<select>` value guard ([#18713](https://github.com/sveltejs/svelte/pull/18713))
  25. - fix: prevent malformed AST output for `<select>` with static `value` attribute ([#18449](https://github.com/sveltejs/svelte/pull/18449))
  27. - fix: apply ownership mutation ignores to binding assignments ([#18718](https://github.com/sveltejs/svelte/pull/18718))
  29. - fix: prevent onoutroend from firing twice when compilerOptions.hmr is true ([#18655](https://github.com/sveltejs/svelte/pull/18655))
  31. - fix: preserve whitespace after inline elements when printing ([#18685](https://github.com/sveltejs/svelte/pull/18685))
  33. - perf: fold SSR block-open markers into the branch's first push ([#18712](https://github.com/sveltejs/svelte/pull/18712))
  35. - fix: run `onDestroy` callbacks when a server render throws ([#18585](https://github.com/sveltejs/svelte/pull/18585))
  37. - fix: report `derived_invalid_export` for `export let x = $derived(...)` in runes mode ([#18692](https://github.com/sveltejs/svelte/pull/18692))
  39. - fix: never apply class hash to elements inside `<svelte:head>` ([#18160](https://github.com/sveltejs/svelte/pull/18160))
  41. - fix: keep `defaultChecked` on hydrated radio inputs with spread attributes ([#18701](https://github.com/sveltejs/svelte/pull/18701))
  43. - fix: accept `onfocusin`/`onfocusout` in `a11y_mouse_events_have_key_events` ([#18689](https://github.com/sveltejs/svelte/pull/18689))
  45. - perf: O(n²)→O(n) Map lookups for legacy `$:` reactive statement ordering ([#18602](https://github.com/sveltejs/svelte/pull/18602))
  47. - fix: distinct memoizer on style/class directives ([#18466](https://github.com/sveltejs/svelte/pull/18466))
  49. - fix: measure nested transitions before applying their starting styles ([#18647](https://github.com/sveltejs/svelte/pull/18647))
  51. - fix: don't turn component instances stored in `$state` into state proxies ([#18646](https://github.com/sveltejs/svelte/pull/18646))
  53. - perf: emit `$.only_child` for elements with a single child ([#18717](https://github.com/sveltejs/svelte/pull/18717))
  55. - fix: omit `bind:focused` from SSR output (it has no HTML attribute) ([#18724](https://github.com/sveltejs/svelte/pull/18724))
  57. - fix: more robust rendering of Svelte custom element slots ([#18710](https://github.com/sveltejs/svelte/pull/18710))
  59. - perf: optimize simple object destructuring in `@const` tags ([#18390](https://github.com/sveltejs/svelte/pull/18390))
  61. - fix: properly apply static textarea value attribute during CSR ([#18727](https://github.com/sveltejs/svelte/pull/18727))
  63. - fix: end a restored reaction context at the end of its synchronous segment ([#18694](https://github.com/sveltejs/svelte/pull/18694))
  65. - fix: keep the dependencies of a reaction that throws, so deriveds it read are neither leaked nor stuck in their error ([#18703](https://github.com/sveltejs/svelte/pull/18703))
  67. - fix: don't resurrect outroing elements when an ancestor block is paused and resumed ([#18431](https://github.com/sveltejs/svelte/pull/18431))
  69. - perf: use `$.comment()` for single-comment templates ([#18714](https://github.com/sveltejs/svelte/pull/18714))
  71. - chore: move `@types/trusted-types` to devDependencies ([#18730](https://github.com/sveltejs/svelte/pull/18730))
  73. - perf: store setters cache as `Set` instead of `Array` ([#18251](https://github.com/sveltejs/svelte/pull/18251))
  75. - fix: transform derived assignments and select function bindings correctly during server-side rendering ([#18669](https://github.com/sveltejs/svelte/pull/18669))
  77. - fix: keep boolean attributes with an empty string value when rendering attribute objects on the server ([#18721](https://github.com/sveltejs/svelte/pull/18721))
  79. - fix: sync `SvelteURL` port signal when the protocol setter clears the port ([#18705](https://github.com/sveltejs/svelte/pull/18705))
  81. - fix: block declaration tags and `{@const}` on async values read inside closures ([#18533](https://github.com/sveltejs/svelte/pull/18533))
  83. - fix: avoid css tree-shaking for exported Snippet ([#18540](https://github.com/sveltejs/svelte/pull/18540))
  85. - perf: treat `<img loading>` as a static element again ([#18711](https://github.com/sveltejs/svelte/pull/18711))
  87. - fix: prevent `selectedcontent` mutation from changing the selected option ([#18495](https://github.com/sveltejs/svelte/pull/18495))
  89. - fix: avoid `NaN` keyframe values in `slide` transition for elements without a layout box ([#18430](https://github.com/sveltejs/svelte/pull/18430))
  91. - fix: preserve line feed character references in attribute values ([#18691](https://github.com/sveltejs/svelte/pull/18691))
  93. - fix: decode uppercase-`X` hex numeric character references (`&#X...;`) ([#18708](https://github.com/sveltejs/svelte/pull/18708))
  95. - chore: clarify when `$effect.pre` runs relative to DOM updates ([#18534](https://github.com/sveltejs/svelte/pull/18534))
  97. - fix: scope SSR boundary failed snippets to their boundary ([#18593](https://github.com/sveltejs/svelte/pull/18593))

vedi su githubimported 2026-09-28 via npm