From e802d3b2cc0b6b5f96f853833fc6852705554a6c Mon Sep 17 00:00:00 2001
From: "Ahmad S." <navorite@gmail.com>
Date: Fri, 11 Jul 2025 20:31:22 +0300
Subject: [PATCH 01/10] chore: replace inline regex with variable (#16340)

* chore: replace inline regex with variable

* Update packages/svelte/src/compiler/phases/patterns.js

Co-authored-by: ComputerGuy <63362464+Ocean-OS@users.noreply.github.com>

* Update a11y.js

* Update a11y.js

---------

Co-authored-by: ComputerGuy <63362464+Ocean-OS@users.noreply.github.com>
---
 .changeset/tiny-news-whisper.md                             | 5 +++++
 .../src/compiler/phases/2-analyze/visitors/shared/a11y.js   | 6 ++++--
 packages/svelte/src/compiler/phases/patterns.js             | 2 ++
 3 files changed, 11 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/tiny-news-whisper.md

diff --git a/.changeset/tiny-news-whisper.md b/.changeset/tiny-news-whisper.md
new file mode 100644
index 000000000000..8bf877085d30
--- /dev/null
+++ b/.changeset/tiny-news-whisper.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+chore: replace inline regex with variable
diff --git a/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y.js b/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y.js
index 1f58a28cad73..e103e3eb80f7 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y.js
@@ -6,7 +6,9 @@ import { roles as roles_map, aria, elementRoles } from 'aria-query';
 import { AXObjects, AXObjectRoles, elementAXObjects } from 'axobject-query';
 import {
 	regex_heading_tags,
+	regex_js_prefix,
 	regex_not_whitespace,
+	regex_redundant_img_alt,
 	regex_starts_with_vowel,
 	regex_whitespaces
 } from '../../../patterns.js';
@@ -1011,7 +1013,7 @@ export function check_element(node, context) {
 		if (href) {
 			const href_value = get_static_text_value(href);
 			if (href_value !== null) {
-				if (href_value === '' || href_value === '#' || /^\W*javascript:/i.test(href_value)) {
+				if (href_value === '' || href_value === '#' || regex_js_prefix.test(href_value)) {
 					w.a11y_invalid_attribute(href, href_value, href.name);
 				}
 			}
@@ -1061,7 +1063,7 @@ export function check_element(node, context) {
 		const alt_attribute = get_static_text_value(attribute_map.get('alt'));
 		const aria_hidden = get_static_value(attribute_map.get('aria-hidden'));
 		if (alt_attribute && !aria_hidden && !has_spread) {
-			if (/\b(image|picture|photo)\b/i.test(alt_attribute)) {
+			if (regex_redundant_img_alt.test(alt_attribute)) {
 				w.a11y_img_redundant_alt(node);
 			}
 		}
diff --git a/packages/svelte/src/compiler/phases/patterns.js b/packages/svelte/src/compiler/phases/patterns.js
index 2bee717131c7..448be7f9499f 100644
--- a/packages/svelte/src/compiler/phases/patterns.js
+++ b/packages/svelte/src/compiler/phases/patterns.js
@@ -23,3 +23,5 @@ export const regex_heading_tags = /^h[1-6]$/;
 export const regex_illegal_attribute_character = /(^[0-9-.])|[\^$@%&#?!|()[\]{}^*+~;]/;
 export const regex_bidirectional_control_characters =
 	/[\u202a\u202b\u202c\u202d\u202e\u2066\u2067\u2068\u2069]+/g;
+export const regex_js_prefix = /^\W*javascript:/i;
+export const regex_redundant_img_alt = /\b(image|picture|photo)\b/i;

From 96c1a10042475c4ef8b55dfdca8538a25e792626 Mon Sep 17 00:00:00 2001
From: "Ahmad S." <navorite@gmail.com>
Date: Fri, 11 Jul 2025 20:41:59 +0300
Subject: [PATCH 02/10] fix: silence autofocus a11y warning inside `<dialog>`
 (#16341)

---
 .changeset/cuddly-humans-end.md                            | 5 +++++
 .../src/compiler/phases/2-analyze/visitors/shared/a11y.js  | 2 +-
 .../tests/validator/samples/a11y-no-autofocus/input.svelte | 7 ++++++-
 3 files changed, 12 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/cuddly-humans-end.md

diff --git a/.changeset/cuddly-humans-end.md b/.changeset/cuddly-humans-end.md
new file mode 100644
index 000000000000..d02e08de7aac
--- /dev/null
+++ b/.changeset/cuddly-humans-end.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: silence autofocus a11y warning inside `<dialog>`
diff --git a/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y.js b/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y.js
index e103e3eb80f7..152e679bf576 100644
--- a/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y.js
+++ b/packages/svelte/src/compiler/phases/2-analyze/visitors/shared/a11y.js
@@ -877,7 +877,7 @@ export function check_element(node, context) {
 		}
 
 		// no-autofocus
-		if (name === 'autofocus') {
+		if (name === 'autofocus' && node.name !== 'dialog' && !is_parent(context.path, ['dialog'])) {
 			w.a11y_autofocus(attribute);
 		}
 
diff --git a/packages/svelte/tests/validator/samples/a11y-no-autofocus/input.svelte b/packages/svelte/tests/validator/samples/a11y-no-autofocus/input.svelte
index 769dbe8c5b69..7b1dccd1e835 100644
--- a/packages/svelte/tests/validator/samples/a11y-no-autofocus/input.svelte
+++ b/packages/svelte/tests/validator/samples/a11y-no-autofocus/input.svelte
@@ -1 +1,6 @@
-<div autofocus></div>
\ No newline at end of file
+<div autofocus></div>
+<dialog autofocus>
+</dialog>
+<dialog>
+	<input autofocus>
+</dialog>

From 58baf80a70433a27a58bf5a642b4ccfd0c23349b Mon Sep 17 00:00:00 2001
From: ComputerGuy <63362464+Ocean-OS@users.noreply.github.com>
Date: Sun, 13 Jul 2025 02:40:26 -0700
Subject: [PATCH 03/10] docs: add note about proxying state proxies (#16354)

---
 documentation/docs/02-runes/02-$state.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/documentation/docs/02-runes/02-$state.md b/documentation/docs/02-runes/02-$state.md
index 8e6c91fad769..7c4571e575e3 100644
--- a/documentation/docs/02-runes/02-$state.md
+++ b/documentation/docs/02-runes/02-$state.md
@@ -50,7 +50,7 @@ todos.push({
 });
 ```
 
-> [!NOTE] When you update properties of proxies, the original object is _not_ mutated.
+> [!NOTE] When you update properties of proxies, the original object is _not_ mutated. If you desire to use your own proxy handlers in a state proxy, [you should wrap the object _after_ wrapping it in `$state`](https://svelte.dev/playground/hello-world?version=latest#H4sIAAAAAAAACpWR3WoDIRCFX2UqhWyIJL3erAulL9C7XnQLMe5ksbUqOpsfln33YuyGFNJC8UKdc2bOhw7Myk9kJXsJ0nttO9jcR5KEG9AWJDwHdzwxznbaYGTl68Do5JM_FRifuh-9X8Y9Gkq1rYx4q66cJbQUWcmqqIL2VDe2IYMEbvuOikBADi-GJDSkXG-phId0G-frye2DO2psQYDFQ0Ys8gQO350dUkEydEg82T0GOs0nsSG9g2IqgxACZueo2ZUlpdvoDC6N64qsg1QKY8T2bpZp8gpIfbCQ85Zn50Ud82HkeY83uDjspenxv3jXcSDyjPWf9L1vJf0GH666J-jLu1ery4dV257IWXBWGa0-xFDMQdTTn2ScxWKsn86ROsLwQxqrVR5QM84Ij8TKFD2-cUZSm4O2LSt30kQcvwCgCmfZnAIAAA==).
 
 Note that if you destructure a reactive value, the references are not reactive — as in normal JavaScript, they are evaluated at the point of destructuring:
 

From 61f75651d6a4f1106a55c2cd357751d473729e55 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Sun, 13 Jul 2025 12:48:08 -0400
Subject: [PATCH 04/10] chore: re-export shared errors (#16356)

---
 .../process-messages/templates/client-errors.js       |  2 ++
 .../process-messages/templates/server-errors.js       |  2 ++
 packages/svelte/src/index-client.js                   | 11 +++++------
 packages/svelte/src/internal/client/context.js        |  4 ++--
 packages/svelte/src/internal/client/dev/validation.js |  7 ++++---
 packages/svelte/src/internal/client/errors.js         |  2 ++
 packages/svelte/src/internal/server/context.js        |  2 +-
 packages/svelte/src/internal/server/dev.js            |  4 ++--
 packages/svelte/src/internal/server/errors.js         |  2 +-
 packages/svelte/src/legacy/legacy-client.js           |  4 ++--
 10 files changed, 23 insertions(+), 17 deletions(-)

diff --git a/packages/svelte/scripts/process-messages/templates/client-errors.js b/packages/svelte/scripts/process-messages/templates/client-errors.js
index c72e9f9d5e7a..ef749b4ba3c9 100644
--- a/packages/svelte/scripts/process-messages/templates/client-errors.js
+++ b/packages/svelte/scripts/process-messages/templates/client-errors.js
@@ -1,5 +1,7 @@
 import { DEV } from 'esm-env';
 
+export * from '../shared/errors.js';
+
 /**
  * MESSAGE
  * @param {string} PARAMETER
diff --git a/packages/svelte/scripts/process-messages/templates/server-errors.js b/packages/svelte/scripts/process-messages/templates/server-errors.js
index 6fb792456470..0bbe801abc99 100644
--- a/packages/svelte/scripts/process-messages/templates/server-errors.js
+++ b/packages/svelte/scripts/process-messages/templates/server-errors.js
@@ -1,3 +1,5 @@
+export * from '../shared/errors.js';
+
 /**
  * MESSAGE
  * @param {string} PARAMETER
diff --git a/packages/svelte/src/index-client.js b/packages/svelte/src/index-client.js
index 0d962aacd147..ae1caf16d937 100644
--- a/packages/svelte/src/index-client.js
+++ b/packages/svelte/src/index-client.js
@@ -5,7 +5,6 @@ import { active_reaction, untrack } from './internal/client/runtime.js';
 import { is_array } from './internal/shared/utils.js';
 import { user_effect } from './internal/client/index.js';
 import * as e from './internal/client/errors.js';
-import { lifecycle_outside_component } from './internal/shared/errors.js';
 import { legacy_mode_flag } from './internal/flags/index.js';
 import { component_context } from './internal/client/context.js';
 import { DEV } from 'esm-env';
@@ -91,7 +90,7 @@ export function getAbortSignal() {
  */
 export function onMount(fn) {
 	if (component_context === null) {
-		lifecycle_outside_component('onMount');
+		e.lifecycle_outside_component('onMount');
 	}
 
 	if (legacy_mode_flag && component_context.l !== null) {
@@ -115,7 +114,7 @@ export function onMount(fn) {
  */
 export function onDestroy(fn) {
 	if (component_context === null) {
-		lifecycle_outside_component('onDestroy');
+		e.lifecycle_outside_component('onDestroy');
 	}
 
 	onMount(() => () => untrack(fn));
@@ -158,7 +157,7 @@ function create_custom_event(type, detail, { bubbles = false, cancelable = false
 export function createEventDispatcher() {
 	const active_component_context = component_context;
 	if (active_component_context === null) {
-		lifecycle_outside_component('createEventDispatcher');
+		e.lifecycle_outside_component('createEventDispatcher');
 	}
 
 	return (type, detail, options) => {
@@ -196,7 +195,7 @@ export function createEventDispatcher() {
  */
 export function beforeUpdate(fn) {
 	if (component_context === null) {
-		lifecycle_outside_component('beforeUpdate');
+		e.lifecycle_outside_component('beforeUpdate');
 	}
 
 	if (component_context.l === null) {
@@ -219,7 +218,7 @@ export function beforeUpdate(fn) {
  */
 export function afterUpdate(fn) {
 	if (component_context === null) {
-		lifecycle_outside_component('afterUpdate');
+		e.lifecycle_outside_component('afterUpdate');
 	}
 
 	if (component_context.l === null) {
diff --git a/packages/svelte/src/internal/client/context.js b/packages/svelte/src/internal/client/context.js
index 6876a89f57e6..eae326f9bbd3 100644
--- a/packages/svelte/src/internal/client/context.js
+++ b/packages/svelte/src/internal/client/context.js
@@ -1,7 +1,7 @@
 /** @import { ComponentContext, DevStackEntry } from '#client' */
 
 import { DEV } from 'esm-env';
-import { lifecycle_outside_component } from '../shared/errors.js';
+import * as e from './errors.js';
 import { source } from './reactivity/sources.js';
 import {
 	active_effect,
@@ -205,7 +205,7 @@ export function is_runes() {
  */
 function get_or_init_context_map(name) {
 	if (component_context === null) {
-		lifecycle_outside_component(name);
+		e.lifecycle_outside_component(name);
 	}
 
 	return (component_context.c ??= new Map(get_parent_context(component_context) || undefined));
diff --git a/packages/svelte/src/internal/client/dev/validation.js b/packages/svelte/src/internal/client/dev/validation.js
index e41e4c46283d..60d140c71844 100644
--- a/packages/svelte/src/internal/client/dev/validation.js
+++ b/packages/svelte/src/internal/client/dev/validation.js
@@ -1,15 +1,16 @@
-import { invalid_snippet_arguments } from '../../shared/errors.js';
+import * as e from '../errors.js';
 /**
  * @param {Node} anchor
  * @param {...(()=>any)[]} args
  */
 export function validate_snippet_args(anchor, ...args) {
 	if (typeof anchor !== 'object' || !(anchor instanceof Node)) {
-		invalid_snippet_arguments();
+		e.invalid_snippet_arguments();
 	}
+
 	for (let arg of args) {
 		if (typeof arg !== 'function') {
-			invalid_snippet_arguments();
+			e.invalid_snippet_arguments();
 		}
 	}
 }
diff --git a/packages/svelte/src/internal/client/errors.js b/packages/svelte/src/internal/client/errors.js
index 5c3f5340e1d1..64dc34e8d097 100644
--- a/packages/svelte/src/internal/client/errors.js
+++ b/packages/svelte/src/internal/client/errors.js
@@ -2,6 +2,8 @@
 
 import { DEV } from 'esm-env';
 
+export *  from '../shared/errors.js';
+
 /**
  * Using `bind:value` together with a checkbox input is not allowed. Use `bind:checked` instead
  * @returns {never}
diff --git a/packages/svelte/src/internal/server/context.js b/packages/svelte/src/internal/server/context.js
index 4e547f48cb5b..bae93beb53ff 100644
--- a/packages/svelte/src/internal/server/context.js
+++ b/packages/svelte/src/internal/server/context.js
@@ -1,7 +1,7 @@
 /** @import { Component } from '#server' */
 import { DEV } from 'esm-env';
 import { on_destroy } from './index.js';
-import * as e from '../shared/errors.js';
+import * as e from './errors.js';
 
 /** @type {Component | null} */
 export var current_component = null;
diff --git a/packages/svelte/src/internal/server/dev.js b/packages/svelte/src/internal/server/dev.js
index efc761d7c5ef..3c320f9698f4 100644
--- a/packages/svelte/src/internal/server/dev.js
+++ b/packages/svelte/src/internal/server/dev.js
@@ -5,7 +5,7 @@ import {
 	is_tag_valid_with_parent
 } from '../../html-tree-validation.js';
 import { current_component } from './context.js';
-import { invalid_snippet_arguments } from '../shared/errors.js';
+import * as e from './errors.js';
 import { HeadPayload, Payload } from './payload.js';
 
 /**
@@ -102,6 +102,6 @@ export function validate_snippet_args(payload) {
 		// for some reason typescript consider the type of payload as never after the first instanceof
 		!(payload instanceof Payload || /** @type {any} */ (payload) instanceof HeadPayload)
 	) {
-		invalid_snippet_arguments();
+		e.invalid_snippet_arguments();
 	}
 }
diff --git a/packages/svelte/src/internal/server/errors.js b/packages/svelte/src/internal/server/errors.js
index e47530c9aaf9..458937218f84 100644
--- a/packages/svelte/src/internal/server/errors.js
+++ b/packages/svelte/src/internal/server/errors.js
@@ -1,6 +1,6 @@
 /* This file is generated by scripts/process-messages/index.js. Do not edit! */
 
-
+export *  from '../shared/errors.js';
 
 /**
  * `%name%(...)` is not available on the server
diff --git a/packages/svelte/src/legacy/legacy-client.js b/packages/svelte/src/legacy/legacy-client.js
index 45c478ecab1e..61acbeaa2850 100644
--- a/packages/svelte/src/legacy/legacy-client.js
+++ b/packages/svelte/src/legacy/legacy-client.js
@@ -4,8 +4,8 @@ import { user_pre_effect } from '../internal/client/reactivity/effects.js';
 import { mutable_source, set } from '../internal/client/reactivity/sources.js';
 import { hydrate, mount, unmount } from '../internal/client/render.js';
 import { active_effect, flushSync, get, set_signal_status } from '../internal/client/runtime.js';
-import { lifecycle_outside_component } from '../internal/shared/errors.js';
 import { define_property, is_array } from '../internal/shared/utils.js';
+import * as e from '../internal/client/errors.js';
 import * as w from '../internal/client/warnings.js';
 import { DEV } from 'esm-env';
 import { FILENAME } from '../constants.js';
@@ -245,7 +245,7 @@ export function handlers(...handlers) {
 export function createBubbler() {
 	const active_component_context = component_context;
 	if (active_component_context === null) {
-		lifecycle_outside_component('createBubbler');
+		e.lifecycle_outside_component('createBubbler');
 	}
 
 	return (/**@type {string}*/ type) => (/**@type {Event}*/ event) => {

From 4ef53a75a9f7428efe169ab2e037e87508c3ac87 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Sun, 13 Jul 2025 15:15:02 -0400
Subject: [PATCH 05/10] chore: tidy up some stuff (#16357)

* chore: tidy up some stuff

* shut up dumbass
---
 packages/svelte/knip.json                           | 4 ----
 packages/svelte/src/compiler/phases/scope.js        | 6 +++---
 packages/svelte/src/internal/client/context.js      | 9 +--------
 packages/svelte/src/internal/server/abort-signal.js | 2 +-
 packages/svelte/src/internal/shared/validate.js     | 2 --
 packages/svelte/src/utils.js                        | 2 +-
 6 files changed, 6 insertions(+), 19 deletions(-)

diff --git a/packages/svelte/knip.json b/packages/svelte/knip.json
index 7a27a64a91b3..0d1bf17e9f90 100644
--- a/packages/svelte/knip.json
+++ b/packages/svelte/knip.json
@@ -1,10 +1,6 @@
 {
 	"$schema": "https://unpkg.com/knip@5/schema.json",
 	"entry": [
-		"src/*/index.js",
-		"src/index-client.ts",
-		"src/index-server.ts",
-		"src/index.d.ts",
 		"tests/**/*.js",
 		"tests/**/*.ts",
 		"!tests/**/*.svelte",
diff --git a/packages/svelte/src/compiler/phases/scope.js b/packages/svelte/src/compiler/phases/scope.js
index 8a2cc39ba735..662924b52c9a 100644
--- a/packages/svelte/src/compiler/phases/scope.js
+++ b/packages/svelte/src/compiler/phases/scope.js
@@ -18,9 +18,9 @@ import { validate_identifier_name } from './2-analyze/visitors/shared/utils.js';
 
 const UNKNOWN = Symbol('unknown');
 /** Includes `BigInt` */
-export const NUMBER = Symbol('number');
-export const STRING = Symbol('string');
-export const FUNCTION = Symbol('string');
+const NUMBER = Symbol('number');
+const STRING = Symbol('string');
+const FUNCTION = Symbol('string');
 
 /** @type {Record<string, [type: NUMBER | STRING | UNKNOWN, fn?: Function]>} */
 const globals = {
diff --git a/packages/svelte/src/internal/client/context.js b/packages/svelte/src/internal/client/context.js
index eae326f9bbd3..a9ceafcd1115 100644
--- a/packages/svelte/src/internal/client/context.js
+++ b/packages/svelte/src/internal/client/context.js
@@ -1,15 +1,8 @@
 /** @import { ComponentContext, DevStackEntry } from '#client' */
-
 import { DEV } from 'esm-env';
 import * as e from './errors.js';
 import { source } from './reactivity/sources.js';
-import {
-	active_effect,
-	active_reaction,
-	set_active_effect,
-	set_active_reaction
-} from './runtime.js';
-import { create_user_effect, teardown } from './reactivity/effects.js';
+import { create_user_effect } from './reactivity/effects.js';
 import { legacy_mode_flag } from '../flags/index.js';
 import { FILENAME } from '../../constants.js';
 
diff --git a/packages/svelte/src/internal/server/abort-signal.js b/packages/svelte/src/internal/server/abort-signal.js
index da579b25927b..a769a46e3d9c 100644
--- a/packages/svelte/src/internal/server/abort-signal.js
+++ b/packages/svelte/src/internal/server/abort-signal.js
@@ -1,7 +1,7 @@
 import { STALE_REACTION } from '#client/constants';
 
 /** @type {AbortController | null} */
-export let controller = null;
+let controller = null;
 
 export function abort() {
 	controller?.abort(STALE_REACTION);
diff --git a/packages/svelte/src/internal/shared/validate.js b/packages/svelte/src/internal/shared/validate.js
index bbb237594bec..8f3e2807e714 100644
--- a/packages/svelte/src/internal/shared/validate.js
+++ b/packages/svelte/src/internal/shared/validate.js
@@ -1,5 +1,3 @@
-/** @import { TemplateNode } from '#client' */
-/** @import { Getters } from '#shared' */
 import { is_void } from '../../utils.js';
 import * as w from './warnings.js';
 import * as e from './errors.js';
diff --git a/packages/svelte/src/utils.js b/packages/svelte/src/utils.js
index 921eaec57cf5..2fc21220f06d 100644
--- a/packages/svelte/src/utils.js
+++ b/packages/svelte/src/utils.js
@@ -428,7 +428,7 @@ export function is_mathml(name) {
 	return MATHML_ELEMENTS.includes(name);
 }
 
-export const STATE_CREATION_RUNES = /** @type {const} */ ([
+const STATE_CREATION_RUNES = /** @type {const} */ ([
 	'$state',
 	'$state.raw',
 	'$derived',

From a23599a196380ce7fc3fb374dac4daee173776b7 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Sun, 13 Jul 2025 18:20:29 -0400
Subject: [PATCH 06/10] fix: don't show adjusted error messages in boundaries
 (#16360)

---
 .changeset/large-balloons-agree.md            |  5 ++
 .../src/internal/client/error-handling.js     | 47 ++++++++++++-------
 .../samples/error-boundary-3/_config.js       |  2 +-
 .../samples/error-boundary-3/main.svelte      |  6 +--
 4 files changed, 38 insertions(+), 22 deletions(-)
 create mode 100644 .changeset/large-balloons-agree.md

diff --git a/.changeset/large-balloons-agree.md b/.changeset/large-balloons-agree.md
new file mode 100644
index 000000000000..935533686274
--- /dev/null
+++ b/.changeset/large-balloons-agree.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: don't show adjusted error messages in boundaries
diff --git a/packages/svelte/src/internal/client/error-handling.js b/packages/svelte/src/internal/client/error-handling.js
index 378f7408ef44..b12f21adfce7 100644
--- a/packages/svelte/src/internal/client/error-handling.js
+++ b/packages/svelte/src/internal/client/error-handling.js
@@ -7,14 +7,16 @@ import { BOUNDARY_EFFECT, EFFECT_RAN } from './constants.js';
 import { define_property, get_descriptor } from '../shared/utils.js';
 import { active_effect } from './runtime.js';
 
+const adjustments = new WeakMap();
+
 /**
  * @param {unknown} error
  */
 export function handle_error(error) {
 	var effect = /** @type {Effect} */ (active_effect);
 
-	if (DEV && error instanceof Error) {
-		adjust_error(error, effect);
+	if (DEV && error instanceof Error && !adjustments.has(error)) {
+		adjustments.set(error, get_adjustments(error, effect));
 	}
 
 	if ((effect.f & EFFECT_RAN) === 0) {
@@ -48,21 +50,19 @@ export function invoke_error_boundary(error, effect) {
 		effect = effect.parent;
 	}
 
+	if (error instanceof Error) {
+		apply_adjustments(error);
+	}
+
 	throw error;
 }
 
-/** @type {WeakSet<Error>} */
-const adjusted_errors = new WeakSet();
-
 /**
  * Add useful information to the error message/stack in development
  * @param {Error} error
  * @param {Effect} effect
  */
-function adjust_error(error, effect) {
-	if (adjusted_errors.has(error)) return;
-	adjusted_errors.add(error);
-
+function get_adjustments(error, effect) {
 	const message_descriptor = get_descriptor(error, 'message');
 
 	// if the message was already changed and it's not configurable we can't change it
@@ -78,17 +78,28 @@ function adjust_error(error, effect) {
 		context = context.p;
 	}
 
-	define_property(error, 'message', {
-		value: error.message + `\n${component_stack}\n`
-	});
+	return {
+		message: error.message + `\n${component_stack}\n`,
+		stack: error.stack
+			?.split('\n')
+			.filter((line) => !line.includes('svelte/src/internal'))
+			.join('\n')
+	};
+}
+
+/**
+ * @param {Error} error
+ */
+function apply_adjustments(error) {
+	const adjusted = adjustments.get(error);
+
+	if (adjusted) {
+		define_property(error, 'message', {
+			value: adjusted.message
+		});
 
-	if (error.stack) {
-		// Filter out internal modules
 		define_property(error, 'stack', {
-			value: error.stack
-				.split('\n')
-				.filter((line) => !line.includes('svelte/src/internal'))
-				.join('\n')
+			value: adjusted.stack
 		});
 	}
 }
diff --git a/packages/svelte/tests/runtime-runes/samples/error-boundary-3/_config.js b/packages/svelte/tests/runtime-runes/samples/error-boundary-3/_config.js
index 040e13676eed..06da8f667c1c 100644
--- a/packages/svelte/tests/runtime-runes/samples/error-boundary-3/_config.js
+++ b/packages/svelte/tests/runtime-runes/samples/error-boundary-3/_config.js
@@ -9,6 +9,6 @@ export default test({
 		flushSync();
 
 		assert.deepEqual(logs, ['error caught']);
-		assert.htmlEqual(target.innerHTML, `<div>Fallback!</div><button>+</button>`);
+		assert.htmlEqual(target.innerHTML, `<div>oh no!</div><button>+</button>`);
 	}
 });
diff --git a/packages/svelte/tests/runtime-runes/samples/error-boundary-3/main.svelte b/packages/svelte/tests/runtime-runes/samples/error-boundary-3/main.svelte
index bad84666c018..bc7fe072c466 100644
--- a/packages/svelte/tests/runtime-runes/samples/error-boundary-3/main.svelte
+++ b/packages/svelte/tests/runtime-runes/samples/error-boundary-3/main.svelte
@@ -1,6 +1,6 @@
 <script>
 	function throw_error() {
-		throw new Error('test')
+		throw new Error('oh no!')
 	}
 
 	let count = $state(0);
@@ -9,8 +9,8 @@
 <svelte:boundary onerror={(e) => console.log('error caught')}>
 	{count > 0 ? throw_error() : null}
 
-	{#snippet failed()}
-		<div>Fallback!</div>
+	{#snippet failed(e)}
+		<div>{e.message}</div>
 	{/snippet}
 </svelte:boundary>
 

From 3f3cf9ff36608ecec9d45e3777eabc074e99f5e5 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Sun, 13 Jul 2025 18:21:10 -0400
Subject: [PATCH 07/10] chore: rename check_dirtiness -> is_dirty (#16359)

---
 .../svelte/src/internal/client/reactivity/effects.js   |  4 ++--
 .../svelte/src/internal/client/reactivity/sources.js   |  4 ++--
 packages/svelte/src/internal/client/runtime.js         | 10 +++++-----
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/packages/svelte/src/internal/client/reactivity/effects.js b/packages/svelte/src/internal/client/reactivity/effects.js
index 51c68055295a..b6a40a68beaf 100644
--- a/packages/svelte/src/internal/client/reactivity/effects.js
+++ b/packages/svelte/src/internal/client/reactivity/effects.js
@@ -1,6 +1,6 @@
 /** @import { ComponentContext, ComponentContextLegacy, Derived, Effect, TemplateNode, TransitionManager } from '#client' */
 import {
-	check_dirtiness,
+	is_dirty,
 	active_effect,
 	active_reaction,
 	update_effect,
@@ -307,7 +307,7 @@ export function legacy_pre_effect_reset() {
 				set_signal_status(effect, MAYBE_DIRTY);
 			}
 
-			if (check_dirtiness(effect)) {
+			if (is_dirty(effect)) {
 				update_effect(effect);
 			}
 
diff --git a/packages/svelte/src/internal/client/reactivity/sources.js b/packages/svelte/src/internal/client/reactivity/sources.js
index f84312e31cfd..c04443c93ead 100644
--- a/packages/svelte/src/internal/client/reactivity/sources.js
+++ b/packages/svelte/src/internal/client/reactivity/sources.js
@@ -12,7 +12,7 @@ import {
 	increment_write_version,
 	update_effect,
 	current_sources,
-	check_dirtiness,
+	is_dirty,
 	untracking,
 	is_destroying_effect,
 	push_reaction_value
@@ -218,7 +218,7 @@ export function internal_set(source, value) {
 				if ((effect.f & CLEAN) !== 0) {
 					set_signal_status(effect, MAYBE_DIRTY);
 				}
-				if (check_dirtiness(effect)) {
+				if (is_dirty(effect)) {
 					update_effect(effect);
 				}
 			}
diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
index 6477e2942a4f..5eca31e8cf1c 100644
--- a/packages/svelte/src/internal/client/runtime.js
+++ b/packages/svelte/src/internal/client/runtime.js
@@ -163,7 +163,7 @@ export function increment_write_version() {
  * @param {Reaction} reaction
  * @returns {boolean}
  */
-export function check_dirtiness(reaction) {
+export function is_dirty(reaction) {
 	var flags = reaction.f;
 
 	if ((flags & DIRTY) !== 0) {
@@ -212,7 +212,7 @@ export function check_dirtiness(reaction) {
 			for (i = 0; i < length; i++) {
 				dependency = dependencies[i];
 
-				if (check_dirtiness(/** @type {Derived} */ (dependency))) {
+				if (is_dirty(/** @type {Derived} */ (dependency))) {
 					update_derived(/** @type {Derived} */ (dependency));
 				}
 
@@ -588,7 +588,7 @@ function flush_queued_effects(effects) {
 		var effect = effects[i];
 
 		if ((effect.f & (DESTROYED | INERT)) === 0) {
-			if (check_dirtiness(effect)) {
+			if (is_dirty(effect)) {
 				var wv = write_version;
 
 				update_effect(effect);
@@ -675,7 +675,7 @@ function process_effects(root) {
 			} else if (is_branch) {
 				effect.f ^= CLEAN;
 			} else {
-				if (check_dirtiness(effect)) {
+				if (is_dirty(effect)) {
 					update_effect(effect);
 				}
 			}
@@ -802,7 +802,7 @@ export function get(signal) {
 	if (is_derived && !is_destroying_effect) {
 		derived = /** @type {Derived} */ (signal);
 
-		if (check_dirtiness(derived)) {
+		if (is_dirty(derived)) {
 			update_derived(derived);
 		}
 	}

From df5801c5fef7735fa67b016ebf0fea5acb8f2fc2 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Mon, 14 Jul 2025 09:50:55 -0400
Subject: [PATCH 08/10] chore: remove unused option validators (#16361)

---
 .../svelte/src/compiler/validate-options.js   | 27 -------------------
 1 file changed, 27 deletions(-)

diff --git a/packages/svelte/src/compiler/validate-options.js b/packages/svelte/src/compiler/validate-options.js
index 85305d7ce9a5..1fd89139d5a2 100644
--- a/packages/svelte/src/compiler/validate-options.js
+++ b/packages/svelte/src/compiler/validate-options.js
@@ -241,19 +241,6 @@ function validator(fallback, fn) {
 	};
 }
 
-/**
- * @param {number} fallback
- * @returns {Validator}
- */
-function number(fallback) {
-	return validator(fallback, (input, keypath) => {
-		if (typeof input !== 'number') {
-			throw_error(`${keypath} should be a number, if specified`);
-		}
-		return input;
-	});
-}
-
 /**
  * @param {string | undefined} fallback
  * @param {boolean} allow_empty
@@ -273,20 +260,6 @@ function string(fallback, allow_empty = true) {
 	});
 }
 
-/**
- * @param {string[]} fallback
- * @returns {Validator}
- */
-function string_array(fallback) {
-	return validator(fallback, (input, keypath) => {
-		if (input && !Array.isArray(input)) {
-			throw_error(`${keypath} should be a string array, if specified`);
-		}
-
-		return input;
-	});
-}
-
 /**
  * @param {boolean | undefined} fallback
  * @returns {Validator}

From f6a2599ee13ba58b959ce690d9f26acc1c698d63 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Mon, 14 Jul 2025 09:53:30 -0400
Subject: [PATCH 09/10] chore: remove memoize_expression (#16358)

---
 .../client/visitors/SlotElement.js            | 25 ++++++-------
 .../client/visitors/shared/component.js       | 37 +++++++++----------
 .../client/visitors/shared/utils.js           | 12 +-----
 3 files changed, 30 insertions(+), 44 deletions(-)

diff --git a/packages/svelte/src/compiler/phases/3-transform/client/visitors/SlotElement.js b/packages/svelte/src/compiler/phases/3-transform/client/visitors/SlotElement.js
index 401cfde42832..e37cdb2bea7a 100644
--- a/packages/svelte/src/compiler/phases/3-transform/client/visitors/SlotElement.js
+++ b/packages/svelte/src/compiler/phases/3-transform/client/visitors/SlotElement.js
@@ -1,9 +1,9 @@
-/** @import { BlockStatement, Expression, ExpressionStatement, Literal, Property } from 'estree' */
+/** @import { BlockStatement, Expression, ExpressionStatement, Literal, Property, Statement } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
 import * as b from '#compiler/builders';
 import { build_attribute_value } from './shared/element.js';
-import { memoize_expression } from './shared/utils.js';
+import { Memoizer } from './shared/utils.js';
 
 /**
  * @param {AST.SlotElement} node
@@ -22,7 +22,7 @@ export function SlotElement(node, context) {
 	/** @type {ExpressionStatement[]} */
 	const lets = [];
 
-	let is_default = true;
+	const memoizer = new Memoizer();
 
 	let name = b.literal('default');
 
@@ -33,12 +33,11 @@ export function SlotElement(node, context) {
 			const { value, has_state } = build_attribute_value(
 				attribute.value,
 				context,
-				(value, metadata) => (metadata.has_call ? memoize_expression(context.state, value) : value)
+				(value, metadata) => (metadata.has_call ? b.call('$.get', memoizer.add(value)) : value)
 			);
 
 			if (attribute.name === 'name') {
 				name = /** @type {Literal} */ (value);
-				is_default = false;
 			} else if (attribute.name !== 'slot') {
 				if (has_state) {
 					props.push(b.get(attribute.name, [b.return(value)]));
@@ -51,9 +50,14 @@ export function SlotElement(node, context) {
 		}
 	}
 
+	memoizer.apply();
+
 	// Let bindings first, they can be used on attributes
 	context.state.init.push(...lets);
 
+	/** @type {Statement[]} */
+	const statements = memoizer.deriveds(context.state.analysis.runes);
+
 	const props_expression =
 		spreads.length === 0 ? b.object(props) : b.call('$.spread_props', b.object(props), ...spreads);
 
@@ -62,14 +66,9 @@ export function SlotElement(node, context) {
 			? b.null
 			: b.arrow([b.id('$$anchor')], /** @type {BlockStatement} */ (context.visit(node.fragment)));
 
-	const slot = b.call(
-		'$.slot',
-		context.state.node,
-		b.id('$$props'),
-		name,
-		props_expression,
-		fallback
+	statements.push(
+		b.stmt(b.call('$.slot', context.state.node, b.id('$$props'), name, props_expression, fallback))
 	);
 
-	context.state.init.push(b.stmt(slot));
+	context.state.init.push(statements.length === 1 ? statements[0] : b.block(statements));
 }
diff --git a/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/component.js b/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/component.js
index aa3704b50b30..6b52db55ba24 100644
--- a/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/component.js
+++ b/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/component.js
@@ -4,12 +4,7 @@
 import { dev, is_ignored } from '../../../../../state.js';
 import { get_attribute_chunks, object } from '../../../../../utils/ast.js';
 import * as b from '#compiler/builders';
-import {
-	build_bind_this,
-	memoize_expression,
-	validate_binding,
-	add_svelte_meta
-} from '../shared/utils.js';
+import { add_svelte_meta, build_bind_this, Memoizer, validate_binding } from '../shared/utils.js';
 import { build_attribute_value } from '../shared/element.js';
 import { build_event_handler } from './events.js';
 import { determine_slot } from '../../../../../utils/slot.js';
@@ -48,6 +43,8 @@ export function build_component(node, component_name, context) {
 	/** @type {Record<string, Expression[]>} */
 	const events = {};
 
+	const memoizer = new Memoizer();
+
 	/** @type {Property[]} */
 	const custom_css_props = [];
 
@@ -133,15 +130,13 @@ export function build_component(node, component_name, context) {
 		} else if (attribute.type === 'SpreadAttribute') {
 			const expression = /** @type {Expression} */ (context.visit(attribute));
 			if (attribute.metadata.expression.has_state) {
-				let value = expression;
-
-				if (attribute.metadata.expression.has_call) {
-					const id = b.id(context.state.scope.generate('spread_element'));
-					context.state.init.push(b.var(id, b.call('$.derived', b.thunk(value))));
-					value = b.call('$.get', id);
-				}
-
-				props_and_spreads.push(b.thunk(value));
+				props_and_spreads.push(
+					b.thunk(
+						attribute.metadata.expression.has_call
+							? b.call('$.get', memoizer.add(expression))
+							: expression
+					)
+				);
 			} else {
 				props_and_spreads.push(expression);
 			}
@@ -150,10 +145,10 @@ export function build_component(node, component_name, context) {
 				custom_css_props.push(
 					b.init(
 						attribute.name,
-						build_attribute_value(attribute.value, context, (value, metadata) =>
+						build_attribute_value(attribute.value, context, (value, metadata) => {
 							// TODO put the derived in the local block
-							metadata.has_call ? memoize_expression(context.state, value) : value
-						).value
+							return metadata.has_call ? b.call('$.get', memoizer.add(value)) : value;
+						}).value
 					)
 				);
 				continue;
@@ -184,7 +179,7 @@ export function build_component(node, component_name, context) {
 						);
 					});
 
-					return should_wrap_in_derived ? memoize_expression(context.state, value) : value;
+					return should_wrap_in_derived ? b.call('$.get', memoizer.add(value)) : value;
 				}
 			);
 
@@ -444,7 +439,7 @@ export function build_component(node, component_name, context) {
 		};
 	}
 
-	const statements = [...snippet_declarations];
+	const statements = [...snippet_declarations, ...memoizer.deriveds(context.state.analysis.runes)];
 
 	if (is_component_dynamic) {
 		const prev = fn;
@@ -492,5 +487,7 @@ export function build_component(node, component_name, context) {
 		statements.push(add_svelte_meta(fn(anchor), node, 'component', { componentTag: node.name }));
 	}
 
+	memoizer.apply();
+
 	return statements.length > 1 ? b.block(statements) : statements[0];
 }
diff --git a/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js b/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js
index de74fede0cef..eed806339d14 100644
--- a/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js
+++ b/packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js
@@ -8,17 +8,7 @@ import { sanitize_template_string } from '../../../../../utils/sanitize_template
 import { regex_is_valid_identifier } from '../../../../patterns.js';
 import is_reference from 'is-reference';
 import { dev, is_ignored, locator, component_name } from '../../../../../state.js';
-import { build_getter, create_derived } from '../../utils.js';
-
-/**
- * @param {ComponentClientTransformState} state
- * @param {Expression} value
- */
-export function memoize_expression(state, value) {
-	const id = b.id(state.scope.generate('expression'));
-	state.init.push(b.const(id, create_derived(state, b.thunk(value))));
-	return b.call('$.get', id);
-}
+import { build_getter } from '../../utils.js';
 
 /**
  * A utility for extracting complex expressions (such as call expressions)

From 6d8f39f8d2e7c78cb5dc4bbfea8ae76150351b2b Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Mon, 14 Jul 2025 12:36:21 -0400
Subject: [PATCH 10/10] Version Packages (#16347)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 .changeset/cuddly-humans-end.md    |  5 -----
 .changeset/large-balloons-agree.md |  5 -----
 .changeset/tiny-news-whisper.md    |  5 -----
 packages/svelte/CHANGELOG.md       | 10 ++++++++++
 packages/svelte/package.json       |  2 +-
 packages/svelte/src/version.js     |  2 +-
 6 files changed, 12 insertions(+), 17 deletions(-)
 delete mode 100644 .changeset/cuddly-humans-end.md
 delete mode 100644 .changeset/large-balloons-agree.md
 delete mode 100644 .changeset/tiny-news-whisper.md

diff --git a/.changeset/cuddly-humans-end.md b/.changeset/cuddly-humans-end.md
deleted file mode 100644
index d02e08de7aac..000000000000
--- a/.changeset/cuddly-humans-end.md
+++ /dev/null
@@ -1,5 +0,0 @@
----
-'svelte': patch
----
-
-fix: silence autofocus a11y warning inside `<dialog>`
diff --git a/.changeset/large-balloons-agree.md b/.changeset/large-balloons-agree.md
deleted file mode 100644
index 935533686274..000000000000
--- a/.changeset/large-balloons-agree.md
+++ /dev/null
@@ -1,5 +0,0 @@
----
-'svelte': patch
----
-
-fix: don't show adjusted error messages in boundaries
diff --git a/.changeset/tiny-news-whisper.md b/.changeset/tiny-news-whisper.md
deleted file mode 100644
index 8bf877085d30..000000000000
--- a/.changeset/tiny-news-whisper.md
+++ /dev/null
@@ -1,5 +0,0 @@
----
-'svelte': patch
----
-
-chore: replace inline regex with variable
diff --git a/packages/svelte/CHANGELOG.md b/packages/svelte/CHANGELOG.md
index 8f158c528f6d..7b822ee9b1f0 100644
--- a/packages/svelte/CHANGELOG.md
+++ b/packages/svelte/CHANGELOG.md
@@ -1,5 +1,15 @@
 # svelte
 
+## 5.35.7
+
+### Patch Changes
+
+- fix: silence autofocus a11y warning inside `<dialog>` ([#16341](https://github.com/sveltejs/svelte/pull/16341))
+
+- fix: don't show adjusted error messages in boundaries ([#16360](https://github.com/sveltejs/svelte/pull/16360))
+
+- chore: replace inline regex with variable ([#16340](https://github.com/sveltejs/svelte/pull/16340))
+
 ## 5.35.6
 
 ### Patch Changes
diff --git a/packages/svelte/package.json b/packages/svelte/package.json
index 4eed145f3fd1..44957964b76f 100644
--- a/packages/svelte/package.json
+++ b/packages/svelte/package.json
@@ -2,7 +2,7 @@
   "name": "svelte",
   "description": "Cybernetically enhanced web apps",
   "license": "MIT",
-  "version": "5.35.6",
+  "version": "5.35.7",
   "type": "module",
   "types": "./types/index.d.ts",
   "engines": {
diff --git a/packages/svelte/src/version.js b/packages/svelte/src/version.js
index 266b0b94910d..0674d4665235 100644
--- a/packages/svelte/src/version.js
+++ b/packages/svelte/src/version.js
@@ -4,5 +4,5 @@
  * The current version, as set in package.json.
  * @type {string}
  */
-export const VERSION = '5.35.6';
+export const VERSION = '5.35.7';
 export const PUBLIC_VERSION = '5';

<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>
<html xmlns='http://www.w3.org/1999/xhtml'>
<head>
<title>pFad - Phonifier reborn</title>
<meta http-equiv='Content-Type' content='text/html; charset=utf-8' />
</head>
<body>
<h1>Pfad - The Proxy pFad of &#169; 2024 Garber Painting. All rights reserved.</h1>


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