merge main

documentation/docs/02-runes/05-$props.md

@@ -37,7 +37,7 @@ On the other side, inside `MyComponent.svelte`, we can receive props with the `$
 
 ## Fallback values
 
-Destructuring allows us to declare fallback values, which are used if the parent component does not set a given prop:
+Destructuring allows us to declare fallback values, which are used if the parent component does not set a given prop (or the value is `undefined`):
 
 ```js
 let { adjective = 'happy' } = $props();
@@ -219,4 +219,4 @@ This is useful for linking elements via attributes like `for` and `aria-labelled
 	<label for="{uid}-lastname">Last Name: </label>
 	<input id="{uid}-lastname" type="text" />
 </form>
-```
+```

documentation/docs/03-template-syntax/01-basic-markup.md

@@ -154,6 +154,8 @@ A JavaScript expression can be included as text by surrounding it with curly bra
 {expression}
 ```
 
+Expressions that are `null` or `undefined` will be omitted; all others are [coerced to strings](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String#string_coercion).
+
 Curly braces can be included in a Svelte template by using their [HTML entity](https://developer.mozilla.org/docs/Glossary/Entity) strings: `{`, `{`, or `{` for `{` and `}`, `}`, or `}` for `}`.
 
 If you're using a regular expression (`RegExp`) [literal notation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#literal_notation_and_constructor), you'll need to wrap it in parentheses.

documentation/docs/03-template-syntax/06-snippet.md

@@ -112,6 +112,8 @@ Snippets can reference themselves and each other ([demo](/playground/untitled#H4
 
 ## Passing snippets to components
 
+### Explicit props
+
 Within the template, snippets are values just like any other. As such, they can be passed to components as props ([demo](/playground/untitled#H4sIAAAAAAAAE3VS247aMBD9lZGpBGwDASRegonaPvQL2qdlH5zYEKvBNvbQLbL875VzAcKyj3PmzJnLGU8UOwqSkd8KJdaCk4TsZS0cyV49wYuJuQiQpGd-N2bu_ooaI1YwJ57hpVYoFDqSEepKKw3mO7VDeTTaIvxiRS1gb_URxvO0ibrS8WanIrHUyiHs7Vmigy28RmyHHmKvDMbMmFq4cQInvGSwTsBYWYoMVhCSB2rBFFPsyl0uruTlR3JZCWvlTXl1Yy_mawiR_rbZKZrellJ-5JQ0RiBUgnFhJ9OGR7HKmwVoilXeIye8DOJGfYCgRlZ3iE876TBsZPX7hPdteO75PC4QaIo8vwNPePmANQ2fMeEFHrLD7rR1jTNkW986E8C3KwfwVr8HSHOSEBT_kGRozyIkn_zQveXDL3rIfPJHtUDwzShJd_Qk3gQCbOGLsdq4yfTRJopRuin3I7nv6kL7ARRjmLdBDG3uv1mhuLA3V2mKtqNEf_oCn8p9aN-WYqH5peP4kWBl1UwJzAEPT9U7K--0fRrrWnPTXpCm1_EVdXjpNmlA8G1hPPyM1fKgMqjFHjctXGjLhZ05w0qpDhksGrybuNEHtJnCalZWsuaTlfq6nPaaBSv_HKw-K57BjzOiVj9ZKQYKzQjZodYFqydYTRN4gPhVzTDO2xnma3HsVWjaLjT8nbfwHy7Q5f2dBAAA)):
 
 ```svelte
@@ -144,6 +146,8 @@ Within the template, snippets are values just like any other. As such, they can
 
 Think about it like passing content instead of data to a component. The concept is similar to slots in web components.
 
+### Implicit props
+
 As an authoring convenience, snippets declared directly _inside_ a component implicitly become props _on_ the component ([demo](/playground/untitled#H4sIAAAAAAAAE3VSTa_aMBD8Kyu_SkAbCA-JSzBR20N_QXt6vIMTO8SqsY29tI2s_PcqTiB8vaPHs7MzuxuIZgdBMvJLo0QlOElIJZXwJHsLBBvb_XUASc7Mb9Yu_B-hsMMK5sUzvDQahUZPMkJ96aTFfKd3KA_WOISfrFACKmcOMFmk8TWUTjY73RFLoz1C5U4SPWzhrcN2GKDrlcGEWauEnyRwxCaDdQLWyVJksII2uaMWTDPNLtzX5YX8-kgua-GcHJVXI3u5WEPb0d83O03TMZSmfRzOkG1Db7mNacOL19JagVALxoWbztq-H8U6j0SaYp2P2BGbOyQ2v8PQIFMXLKRDk177pq0zf6d8bMrzwBdd0pamyPMb-IjNEzS2f86Gz_Dwf-2F9nvNSUJQ_EOSoTuJNvngqK5v4Pas7n4-OCwlEEJcQTIMO-nSQwtb-GSdsX46e9gbRoP9yGQ11I0rEuycunu6PHx1QnPhxm3SFN15MOlYEFJZtf0dUywMbwZOeBGsrKNLYB54-1R9WNqVdki7usim6VmQphf7mnpshiQRhNAXdoOfMyX3OgMlKtz0cGEcF27uLSul3mewjPjgOOoDukxjPS9rqfh0pb-8zs6aBSt_7505aZ7B9xOi0T9YKW4UooVsr0zB1BTrWQJ3EL-oWcZ572GxFoezCk37QLe3897-B2i2U62uBAAA)):
 
 ```svelte
@@ -165,6 +169,8 @@ As an authoring convenience, snippets declared directly _inside_ a component imp
 </Table>
 ```
 
+### Implicit `children` snippet
+
 Any content inside the component tags that is _not_ a snippet declaration implicitly becomes part of the `children` snippet ([demo](/playground/untitled#H4sIAAAAAAAAE3WOQQrCMBBFrzIMggql3ddY1Du4si5sOmIwnYRkFKX07lKqglqX8_7_w2uRDw1hjlsWI5ZqTPBoLEXMdy3K3fdZDzB5Ndfep_FKVnpWHSKNce1YiCVijirqYLwUJQOYxrsgsLmIOIZjcA1M02w4n-PpomSVvTclqyEutDX6DA2pZ7_ABIVugrmEC3XJH92P55_G39GodCmWBFrQJ2PrQAwdLGHig_NxNv9xrQa1dhWIawrv1Wzeqawa8953D-8QOmaEAQAA)):
 
 ```svelte
@@ -184,6 +190,8 @@ Any content inside the component tags that is _not_ a snippet declaration implic
 
 > [!NOTE] Note that you cannot have a prop called `children` if you also have content inside the component — for this reason, you should avoid having props with that name
 
+### Optional snippet props
+
 You can declare snippet props as being optional. You can either use optional chaining to not render anything if the snippet isn't set...
 
 ```svelte

documentation/docs/98-reference/.generated/compile-errors.md

@@ -235,7 +235,31 @@ A top-level `:global {...}` block can only contain rules, not declarations
 ### css_global_block_invalid_list
 
 ```
-A `:global` selector cannot be part of a selector list with more than one item
+A `:global` selector cannot be part of a selector list with entries that don't contain `:global`
+```
+
+The following CSS is invalid:
+
+```css
+:global, x {
+    y {
+        color: red;
+    }
+}
+```
+
+This is mixing a `:global` block, which means "everything in here is unscoped", with a scoped selector (`x` in this case). As a result it's not possible to transform the inner selector (`y` in this case) into something that satisfies both requirements. You therefore have to split this up into two selectors:
+
+```css
+:global {
+    y {
+        color: red;
+    }
+}
+
+x y {
+    color: red;
+}
 ```
 
 ### css_global_block_invalid_modifier

documentation/docs/98-reference/.generated/shared-errors.md

@@ -60,6 +60,43 @@ Certain lifecycle methods can only be used during component initialisation. To f
 <button onclick={handleClick}>click me</button>
 ```
 
+### snippet_without_render_tag
+
+```
+Attempted to render a snippet without a `{@render}` block. This would cause the snippet code to be stringified instead of its content being rendered to the DOM. To fix this, change `{snippet}` to `{@render snippet()}`.
+```
+
+A component throwing this error will look something like this (`children` is not being rendered):
+
+```svelte
+<script>
+    let { children } = $props();
+</script>
+
+{children}
+```
+
+...or like this (a parent component is passing a snippet where a non-snippet value is expected):
+
+```svelte
+<!--- file: Parent.svelte --->
+<ChildComponent>
+  {#snippet label()}
+    <span>Hi!</span>
+  {/snippet}
+</ChildComponent>
+```
+
+```svelte
+<!--- file: Child.svelte --->
+<script>
+  let { label } = $props();
+</script>
+
+<!-- This component doesn't expect a snippet, but the parent provided one -->
+<p>{label}</p>
+```
+
 ### store_invalid_shape
 
 ```

documentation/docs/98-reference/21-svelte-reactivity.md

@@ -2,24 +2,6 @@
 title: svelte/reactivity
 ---
 
-Svelte provides reactive versions of various built-ins like `SvelteMap`, `SvelteSet` and `SvelteURL`. These can be imported from `svelte/reactivity` and used just like their native counterparts.
+Svelte provides reactive versions of various built-ins like [`Map`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map), [`Set`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set) and [`URL`](https://developer.mozilla.org/en-US/docs/Web/API/URL) that can be used just like their native counterparts, as well as a handful of additional utilities for handling reactivity.
-
-```svelte
-<script>
-	import { SvelteURL } from 'svelte/reactivity';
-
-	const url = new SvelteURL('https://example.com/path');
-</script>
-
-<!-- changes to these... -->
-<input bind:value={url.protocol} />
-<input bind:value={url.hostname} />
-<input bind:value={url.pathname} />
-
-<hr />
-
-<!-- will update `href` and vice versa -->
-<input bind:value={url.href} />
-```
 
 > MODULE: svelte/reactivity

packages/svelte/CHANGELOG.md

@@ -1,5 +1,49 @@
 # svelte
 
+## 5.27.2
+
+### Patch Changes
+
+- chore: use pkg.imports for common modules ([#15787](https://github.com/sveltejs/svelte/pull/15787))
+
+## 5.27.1
+
+### Patch Changes
+
+- chore: default params for html blocks ([#15778](https://github.com/sveltejs/svelte/pull/15778))
+
+- fix: correct suggested type for custom events without detail ([#15763](https://github.com/sveltejs/svelte/pull/15763))
+
+- fix: Throw on unrendered snippets in `dev` ([#15766](https://github.com/sveltejs/svelte/pull/15766))
+
+- fix: avoid unnecessary read version increments ([#15777](https://github.com/sveltejs/svelte/pull/15777))
+
+## 5.27.0
+
+### Minor Changes
+
+- feat: partially evaluate certain expressions ([#15494](https://github.com/sveltejs/svelte/pull/15494))
+
+### Patch Changes
+
+- fix: relax `:global` selector list validation ([#15762](https://github.com/sveltejs/svelte/pull/15762))
+
+## 5.26.3
+
+### Patch Changes
+
+- fix: correctly validate head snippets on the server ([#15755](https://github.com/sveltejs/svelte/pull/15755))
+
+- fix: ignore mutation validation for props that are not proxies in more cases ([#15759](https://github.com/sveltejs/svelte/pull/15759))
+
+- fix: allow self-closing tags within math namespace ([#15761](https://github.com/sveltejs/svelte/pull/15761))
+
+## 5.26.2
+
+### Patch Changes
+
+- fix: correctly validate `undefined` snippet params with default value ([#15750](https://github.com/sveltejs/svelte/pull/15750))
+
 ## 5.26.1
 
 ### Patch Changes

packages/svelte/messages/compile-errors/style.md

@@ -16,7 +16,31 @@
 
 ## css_global_block_invalid_list
 
-> A `:global` selector cannot be part of a selector list with more than one item
+> A `:global` selector cannot be part of a selector list with entries that don't contain `:global`
+
+The following CSS is invalid:
+
+```css
+:global, x {
+    y {
+        color: red;
+    }
+}
+```
+
+This is mixing a `:global` block, which means "everything in here is unscoped", with a scoped selector (`x` in this case). As a result it's not possible to transform the inner selector (`y` in this case) into something that satisfies both requirements. You therefore have to split this up into two selectors:
+
+```css
+:global {
+    y {
+        color: red;
+    }
+}
+
+x y {
+    color: red;
+}
+```
 
 ## css_global_block_invalid_modifier
 

packages/svelte/messages/shared-errors/errors.md

@@ -52,6 +52,41 @@ Certain lifecycle methods can only be used during component initialisation. To f
 <button onclick={handleClick}>click me</button>
 ```
 
+## snippet_without_render_tag
+
+> Attempted to render a snippet without a `{@render}` block. This would cause the snippet code to be stringified instead of its content being rendered to the DOM. To fix this, change `{snippet}` to `{@render snippet()}`.
+
+A component throwing this error will look something like this (`children` is not being rendered):
+
+```svelte
+<script>
+    let { children } = $props();
+</script>
+
+{children}
+```
+
+...or like this (a parent component is passing a snippet where a non-snippet value is expected):
+
+```svelte
+<!--- file: Parent.svelte --->
+<ChildComponent>
+  {#snippet label()}
+    <span>Hi!</span>
+  {/snippet}
+</ChildComponent>
+```
+
+```svelte
+<!--- file: Child.svelte --->
+<script>
+  let { label } = $props();
+</script>
+
+<!-- This component doesn't expect a snippet, but the parent provided one -->
+<p>{label}</p>
+```
+
 ## store_invalid_shape
 
 > `%name%` is not a store with a `subscribe` method

packages/svelte/package.json

@@ -2,7 +2,7 @@
   "name": "svelte",
   "description": "Cybernetically enhanced web apps",
   "license": "MIT",
-  "version": "5.26.1",
+  "version": "5.27.2",
   "type": "module",
   "types": "./types/index.d.ts",
   "engines": {
@@ -103,6 +103,17 @@
       "default": "./src/events/index.js"
     }
   },
+  "imports": {
+    "#client": "./src/internal/client/types.d.ts",
+    "#client/constants": "./src/internal/client/constants.js",
+    "#compiler": {
+      "types": "./src/compiler/private.d.ts",
+      "default": "./src/compiler/index.js"
+    },
+    "#compiler/builders": "./src/compiler/utils/builders.js",
+    "#server": "./src/internal/server/types.d.ts",
+    "#shared": "./src/internal/shared/types.d.ts"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/sveltejs/svelte.git",

packages/svelte/scripts/generate-types.js

@@ -24,7 +24,12 @@ await createBundle({
 	output: `${dir}/types/index.d.ts`,
 	compilerOptions: {
 		// so that types/properties with `@internal` (and its dependencies) are removed from the output
-		stripInternal: true
+		stripInternal: true,
+		paths: Object.fromEntries(
+			Object.entries(pkg.imports).map(([key, value]) => {
+				return [key, [value.types ?? value.default ?? value]];
+			})
+		)
 	},
 	modules: {
 		[pkg.name]: `${dir}/src/index.d.ts`,

packages/svelte/src/compiler/errors.js

@@ -555,12 +555,12 @@ export function css_global_block_invalid_declaration(node) {
 }
 
 /**
- * A `:global` selector cannot be part of a selector list with more than one item
+ * A `:global` selector cannot be part of a selector list with entries that don't contain `:global`
  * @param {null | number | NodeLike} node
  * @returns {never}
  */
 export function css_global_block_invalid_list(node) {
-	e(node, 'css_global_block_invalid_list', `A \`:global\` selector cannot be part of a selector list with more than one item\nhttps://svelte.dev/e/css_global_block_invalid_list`);
+	e(node, 'css_global_block_invalid_list', `A \`:global\` selector cannot be part of a selector list with entries that don't contain \`:global\`\nhttps://svelte.dev/e/css_global_block_invalid_list`);
 }
 
 /**

packages/svelte/src/compiler/migrate/index.js

@@ -1,7 +1,7 @@
 /** @import { VariableDeclarator, Node, Identifier, AssignmentExpression, LabeledStatement, ExpressionStatement } from 'estree' */
 /** @import { Visitors } from 'zimmerframe' */
 /** @import { ComponentAnalysis } from '../phases/types.js' */
-/** @import { Scope, ScopeRoot } from '../phases/scope.js' */
+/** @import { Scope } from '../phases/scope.js' */
 /** @import { AST, Binding, ValidatedCompileOptions } from '#compiler' */
 import MagicString from 'magic-string';
 import { walk } from 'zimmerframe';

packages/svelte/src/compiler/phases/1-parse/remove_typescript_nodes.js

@@ -1,7 +1,7 @@
 /** @import { Context, Visitors } from 'zimmerframe' */
 /** @import { FunctionExpression, FunctionDeclaration } from 'estree' */
 import { walk } from 'zimmerframe';
-import * as b from '../../utils/builders.js';
+import * as b from '#compiler/builders';
 import * as e from '../../errors.js';
 
 /**

packages/svelte/src/compiler/phases/2-analyze/css/css-analyze.js

@@ -193,10 +193,12 @@ const css_visitors = {
 	Rule(node, context) {
 		node.metadata.parent_rule = context.state.rule;
 
-		node.metadata.is_global_block = node.prelude.children.some((selector) => {
+		// We gotta allow :global x, :global y because CSS preprocessors might generate that from :global { x, y {...} }
+		for (const complex_selector of node.prelude.children) {
 			let is_global_block = false;
 
-			for (const child of selector.children) {
+			for (let selector_idx = 0; selector_idx < complex_selector.children.length; selector_idx++) {
+				const child = complex_selector.children[selector_idx];
 				const idx = child.selectors.findIndex(is_global_block_selector);
 
 				if (is_global_block) {
@@ -204,58 +206,56 @@ const css_visitors = {
 					child.metadata.is_global_like = true;
 				}
 
-				if (idx !== -1) {
+				if (idx === 0) {
-					is_global_block = true;
+					if (
+						child.selectors.length > 1 &&
+						selector_idx === 0 &&
+						node.metadata.parent_rule === null
+					) {
+						e.css_global_block_invalid_modifier_start(child.selectors[1]);
+					} else {
+						// `child` starts with `:global`
+						node.metadata.is_global_block = is_global_block = true;
+
+						for (let i = 1; i < child.selectors.length; i++) {
+							walk(/** @type {AST.CSS.Node} */ (child.selectors[i]), null, {
+								ComplexSelector(node) {
+									node.metadata.used = true;
+								}
+							});
+						}
 
-					for (let i = idx + 1; i < child.selectors.length; i++) {
+						if (child.combinator && child.combinator.name !== ' ') {
-						walk(/** @type {AST.CSS.Node} */ (child.selectors[i]), null, {
+							e.css_global_block_invalid_combinator(child, child.combinator.name);
-							ComplexSelector(node) {
+						}
-								node.metadata.used = true;
-							}
-						});
-					}
-				}
-			}
 
-			return is_global_block;
+						const declaration = node.block.children.find((child) => child.type === 'Declaration');
-		});
+						const is_lone_global =
+							complex_selector.children.length === 1 &&
+							complex_selector.children[0].selectors.length === 1; // just `:global`, not e.g. `:global x`
 
-		if (node.metadata.is_global_block) {
+						if (is_lone_global && node.prelude.children.length > 1) {
-			if (node.prelude.children.length > 1) {
+							// `:global, :global x { z { ... } }` would become `x { z { ... } }` which means `z` is always
-				e.css_global_block_invalid_list(node.prelude);
+							// constrained by `x`, which is not what the user intended
-			}
+							e.css_global_block_invalid_list(node.prelude);
+						}
 
-			const complex_selector = node.prelude.children[0];
+						if (
-			const global_selector = complex_selector.children.find((r, selector_idx) => {
+							declaration &&
-				const idx = r.selectors.findIndex(is_global_block_selector);
+							// :global { color: red; } is invalid, but foo :global { color: red; } is valid
-				if (idx === 0) {
+							node.prelude.children.length === 1 &&
-					if (r.selectors.length > 1 && selector_idx === 0 && node.metadata.parent_rule === null) {
+							is_lone_global
-						e.css_global_block_invalid_modifier_start(r.selectors[1]);
+						) {
+							e.css_global_block_invalid_declaration(declaration);
+						}
 					}
-					return true;
 				} else if (idx !== -1) {
-					e.css_global_block_invalid_modifier(r.selectors[idx]);
+					e.css_global_block_invalid_modifier(child.selectors[idx]);
 				}
-			});
-
-			if (!global_selector) {
-				throw new Error('Internal error: global block without :global selector');
-			}
-
-			if (global_selector.combinator && global_selector.combinator.name !== ' ') {
-				e.css_global_block_invalid_combinator(global_selector, global_selector.combinator.name);
 			}
 
-			const declaration = node.block.children.find((child) => child.type === 'Declaration');
+			if (node.metadata.is_global_block && !is_global_block) {
-
+				e.css_global_block_invalid_list(node.prelude);
-			if (
-				declaration &&
-				// :global { color: red; } is invalid, but foo :global { color: red; } is valid
-				node.prelude.children.length === 1 &&
-				node.prelude.children[0].children.length === 1 &&
-				node.prelude.children[0].children[0].selectors.length === 1
-			) {
-				e.css_global_block_invalid_declaration(declaration);
 			}
 		}
 

packages/svelte/src/compiler/phases/2-analyze/index.js

@@ -5,8 +5,8 @@
 import { walk } from 'zimmerframe';
 import * as e from '../../errors.js';
 import * as w from '../../warnings.js';
-import { extract_identifiers, is_text_attribute } from '../../utils/ast.js';
+import { extract_identifiers } from '../../utils/ast.js';
-import * as b from '../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { Scope, ScopeRoot, create_scopes, get_rune, set_scope } from '../scope.js';
 import check_graph_for_cycles from './utils/check_graph_for_cycles.js';
 import { create_attribute, is_custom_element_node } from '../nodes.js';

packages/svelte/src/compiler/phases/2-analyze/visitors/CallExpression.js

@@ -3,10 +3,10 @@
 /** @import { Context } from '../types' */
 import { get_rune } from '../../scope.js';
 import * as e from '../../../errors.js';
-import { get_parent, unwrap_optional } from '../../../utils/ast.js';
+import { get_parent } from '../../../utils/ast.js';
 import { is_pure, is_safe_identifier } from './shared/utils.js';
 import { dev, locate_node, source } from '../../../state.js';
-import * as b from '../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {CallExpression} node

packages/svelte/src/compiler/phases/2-analyze/visitors/ExportNamedDeclaration.js

@@ -1,7 +1,5 @@
-/** @import { ExportNamedDeclaration, Identifier, Node } from 'estree' */
+/** @import { ExportNamedDeclaration, Identifier } from 'estree' */
-/** @import { Binding } from '#compiler' */
 /** @import { Context } from '../types' */
-/** @import { Scope } from '../../scope' */
 import * as e from '../../../errors.js';
 import { extract_identifiers } from '../../../utils/ast.js';
 

packages/svelte/src/compiler/phases/2-analyze/visitors/Identifier.js

@@ -1,5 +1,4 @@
 /** @import { Expression, Identifier } from 'estree' */
-/** @import { EachBlock } from '#compiler' */
 /** @import { Context } from '../types' */
 import is_reference from 'is-reference';
 import { should_proxy } from '../../3-transform/client/utils.js';

packages/svelte/src/compiler/phases/2-analyze/visitors/MemberExpression.js

@@ -1,10 +1,7 @@
-/** @import { MemberExpression, Node } from 'estree' */
+/** @import { MemberExpression } from 'estree' */
 /** @import { Context } from '../types' */
 import * as e from '../../../errors.js';
-import * as w from '../../../warnings.js';
-import { object } from '../../../utils/ast.js';
 import { is_pure, is_safe_identifier } from './shared/utils.js';
-import { mark_subtree_dynamic } from './shared/fragment.js';
 
 /**
  * @param {MemberExpression} node

packages/svelte/src/compiler/phases/2-analyze/visitors/RegularElement.js

@@ -173,7 +173,8 @@ export function RegularElement(node, context) {
 	if (
 		context.state.analysis.source[node.end - 2] === '/' &&
 		!is_void(node_name) &&
-		!is_svg(node_name)
+		!is_svg(node_name) &&
+		!is_mathml(node_name)
 	) {
 		w.element_invalid_self_closing_tag(node, node.name);
 	}

packages/svelte/src/compiler/phases/2-analyze/visitors/shared/utils.js

@@ -1,4 +1,4 @@
-/** @import { AssignmentExpression, Expression, Identifier, Literal, Node, Pattern, PrivateIdentifier, Super, UpdateExpression, VariableDeclarator } from 'estree' */
+/** @import { AssignmentExpression, Expression, Literal, Node, Pattern, Super, UpdateExpression, VariableDeclarator } from 'estree' */
 /** @import { AST, Binding } from '#compiler' */
 /** @import { AnalysisState, Context } from '../../types' */
 /** @import { Scope } from '../../../scope' */
@@ -6,7 +6,7 @@
 import * as e from '../../../../errors.js';
 import { extract_identifiers } from '../../../../utils/ast.js';
 import * as w from '../../../../warnings.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { get_rune } from '../../../scope.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/client/transform-client.js

@@ -3,7 +3,7 @@
 /** @import { ComponentAnalysis, Analysis } from '../../types' */
 /** @import { Visitors, ComponentClientTransformState, ClientTransformState } from './types' */
 import { walk } from 'zimmerframe';
-import * as b from '../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_getter, is_state_source } from './utils.js';
 import { render_stylesheet } from '../css/index.js';
 import { dev, filename } from '../../../state.js';

packages/svelte/src/compiler/phases/3-transform/client/utils.js

@@ -3,7 +3,7 @@
 /** @import { ClientTransformState, ComponentClientTransformState, ComponentContext } from './types.js' */
 /** @import { Analysis } from '../../types.js' */
 /** @import { Scope } from '../../scope.js' */
-import * as b from '../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { is_simple_expression } from '../../../utils/ast.js';
 import {
 	PROPS_IS_LAZY_INITIAL,

packages/svelte/src/compiler/phases/3-transform/client/visitors/AnimateDirective.js

@@ -1,7 +1,7 @@
 /** @import { Expression } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { parse_directive_name } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/client/visitors/AssignmentExpression.js

@@ -1,7 +1,7 @@
 /** @import { AssignmentExpression, AssignmentOperator, Expression, Identifier, Pattern } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { Context } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import {
 	build_assignment_value,
 	get_attribute_expression,

packages/svelte/src/compiler/phases/3-transform/client/visitors/AwaitBlock.js

@@ -2,7 +2,7 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentClientTransformState, ComponentContext } from '../types' */
 import { extract_identifiers } from '../../../../utils/ast.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { create_derived } from '../utils.js';
 import { get_value } from './shared/declarations.js';
 

packages/svelte/src/compiler/phases/3-transform/client/visitors/BinaryExpression.js

@@ -1,7 +1,7 @@
 /** @import { Expression, BinaryExpression } from 'estree' */
 /** @import { ComponentContext } from '../types' */
 import { dev } from '../../../../state.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {BinaryExpression} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/BindDirective.js

@@ -3,7 +3,7 @@
 /** @import { ComponentContext } from '../types' */
 import { dev, is_ignored } from '../../../../state.js';
 import { is_text_attribute } from '../../../../utils/ast.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { binding_properties } from '../../../bindings.js';
 import { build_attribute_value } from './shared/element.js';
 import { build_bind_this, validate_binding } from './shared/utils.js';

packages/svelte/src/compiler/phases/3-transform/client/visitors/BlockStatement.js

@@ -1,7 +1,7 @@
-/** @import { ArrowFunctionExpression, BlockStatement, CallExpression, Expression, FunctionDeclaration, FunctionExpression, Statement } from 'estree' */
+/** @import { ArrowFunctionExpression, BlockStatement, Expression, FunctionDeclaration, FunctionExpression, Statement } from 'estree' */
 /** @import { ComponentContext } from '../types' */
 import { add_state_transformers } from './shared/declarations.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {BlockStatement} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/BreakStatement.js

@@ -1,6 +1,6 @@
 /** @import { BreakStatement } from 'estree' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {BreakStatement} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/CallExpression.js

@@ -1,7 +1,7 @@
 /** @import { CallExpression, Expression } from 'estree' */
 /** @import { Context } from '../types' */
 import { dev, is_ignored } from '../../../../state.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { get_rune } from '../../../scope.js';
 import { transform_inspect_rune } from '../../utils.js';
 

packages/svelte/src/compiler/phases/3-transform/client/visitors/ClassBody.js

@@ -1,8 +1,6 @@
 /** @import { ClassBody, Expression, Identifier, Literal, MethodDefinition, PrivateIdentifier, PropertyDefinition } from 'estree' */
-/** @import {  } from '#compiler' */
 /** @import { Context, StateField } from '../types' */
-import { dev, is_ignored } from '../../../../state.js';
+import * as b from '#compiler/builders';
-import * as b from '../../../../utils/builders.js';
 import { regex_invalid_identifier_chars } from '../../../patterns.js';
 import { get_rune } from '../../../scope.js';
 import { should_proxy } from '../utils.js';

packages/svelte/src/compiler/phases/3-transform/client/visitors/Component.js

@@ -1,7 +1,7 @@
 /** @import { Expression } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_component } from './shared/component.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/client/visitors/ConstTag.js

@@ -3,7 +3,7 @@
 /** @import { ComponentContext } from '../types' */
 import { dev } from '../../../../state.js';
 import { extract_identifiers } from '../../../../utils/ast.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { create_derived } from '../utils.js';
 import { get_value } from './shared/declarations.js';
 

packages/svelte/src/compiler/phases/3-transform/client/visitors/DebugTag.js

@@ -1,7 +1,7 @@
 /** @import { Expression} from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.DebugTag} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/EachBlock.js

@@ -11,7 +11,7 @@ import {
 } from '../../../../../constants.js';
 import { dev } from '../../../../state.js';
 import { extract_paths, object } from '../../../../utils/ast.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_getter } from '../utils.js';
 import { get_value } from './shared/declarations.js';
 

packages/svelte/src/compiler/phases/3-transform/client/visitors/ExportNamedDeclaration.js

@@ -1,6 +1,6 @@
 /** @import { ExportNamedDeclaration } from 'estree' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {ExportNamedDeclaration} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/ExpressionStatement.js

@@ -1,6 +1,6 @@
 /** @import { Expression, ExpressionStatement } from 'estree' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { get_rune } from '../../../scope.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/client/visitors/Fragment.js

@@ -4,7 +4,7 @@
 /** @import { ComponentClientTransformState, ComponentContext } from '../types' */
 import { TEMPLATE_FRAGMENT, TEMPLATE_USE_IMPORT_NODE } from '../../../../../constants.js';
 import { dev } from '../../../../state.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { sanitize_template_string } from '../../../../utils/sanitize_template_string.js';
 import { clean_nodes, infer_namespace } from '../../utils.js';
 import { process_children } from './shared/fragment.js';

packages/svelte/src/compiler/phases/3-transform/client/visitors/FunctionDeclaration.js

@@ -1,7 +1,7 @@
 /** @import { FunctionDeclaration } from 'estree' */
 /** @import { ComponentContext } from '../types' */
 import { build_hoisted_params } from '../utils.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {FunctionDeclaration} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/HtmlTag.js

@@ -2,7 +2,7 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
 import { is_ignored } from '../../../../state.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.HtmlTag} node
@@ -11,17 +11,22 @@ import * as b from '../../../../utils/builders.js';
 export function HtmlTag(node, context) {
 	context.state.template.push('<!>');
 
-	// push into init, so that bindings run afterwards, which might trigger another run and override hydration
+	const expression = /** @type {Expression} */ (context.visit(node.expression));
-	context.state.init.push(
+
-		b.stmt(
+	const is_svg = context.state.metadata.namespace === 'svg';
-			b.call(
+	const is_mathml = context.state.metadata.namespace === 'mathml';
-				'$.html',
+
-				context.state.node,
+	const statement = b.stmt(
-				b.thunk(/** @type {Expression} */ (context.visit(node.expression))),
+		b.call(
-				b.literal(context.state.metadata.namespace === 'svg'),
+			'$.html',
-				b.literal(context.state.metadata.namespace === 'mathml'),
+			context.state.node,
-				is_ignored(node, 'hydration_html_changed') && b.true
+			b.thunk(expression),
-			)
+			is_svg && b.true,
+			is_mathml && b.true,
+			is_ignored(node, 'hydration_html_changed') && b.true
 		)
 	);
+
+	// push into init, so that bindings run afterwards, which might trigger another run and override hydration
+	context.state.init.push(statement);
 }

packages/svelte/src/compiler/phases/3-transform/client/visitors/Identifier.js

@@ -1,7 +1,7 @@
 /** @import { Identifier, Node } from 'estree' */
 /** @import { Context } from '../types' */
 import is_reference from 'is-reference';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_getter } from '../utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/client/visitors/IfBlock.js

@@ -1,7 +1,7 @@
-/** @import { BlockStatement, Expression, Identifier } from 'estree' */
+/** @import { BlockStatement, Expression } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.IfBlock} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/ImportDeclaration.js

@@ -1,6 +1,6 @@
 /** @import { ImportDeclaration } from 'estree' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {ImportDeclaration} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/KeyBlock.js

@@ -1,7 +1,7 @@
 /** @import { Expression } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.KeyBlock} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/LabeledStatement.js

@@ -1,9 +1,7 @@
-/** @import { Location } from 'locate-character' */
 /** @import { Expression, LabeledStatement, Statement } from 'estree' */
 /** @import { ReactiveStatement } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
-import { dev, is_ignored, locator } from '../../../../state.js';
+import * as b from '#compiler/builders';
-import * as b from '../../../../utils/builders.js';
 import { build_getter } from '../utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/client/visitors/LetDirective.js

@@ -1,7 +1,7 @@
 /** @import { Expression } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { create_derived } from '../utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/client/visitors/MemberExpression.js

@@ -1,6 +1,6 @@
 /** @import { MemberExpression } from 'estree' */
 /** @import { Context } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {MemberExpression} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/OnDirective.js

@@ -1,6 +1,6 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_event, build_event_handler } from './shared/events.js';
 
 const modifiers = [

packages/svelte/src/compiler/phases/3-transform/client/visitors/Program.js

@@ -1,7 +1,7 @@
 /** @import { Expression, ImportDeclaration, MemberExpression, Program } from 'estree' */
 /** @import { ComponentContext } from '../types' */
 import { build_getter, is_prop_source } from '../utils.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { add_state_transformers } from './shared/declarations.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/client/visitors/RegularElement.js

@@ -1,4 +1,4 @@
-/** @import { ArrayExpression, Expression, ExpressionStatement, Identifier, MemberExpression, ObjectExpression, Statement } from 'estree' */
+/** @import { ArrayExpression, Expression, ExpressionStatement, Identifier, MemberExpression, ObjectExpression } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { SourceLocation } from '#shared' */
 /** @import { ComponentClientTransformState, ComponentContext } from '../types' */
@@ -13,7 +13,7 @@ import {
 import { escape_html } from '../../../../../escaping.js';
 import { dev, is_ignored, locator } from '../../../../state.js';
 import { is_event_attribute, is_text_attribute } from '../../../../utils/ast.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { is_custom_element_node } from '../../../nodes.js';
 import { clean_nodes, determine_namespace_for_children } from '../../utils.js';
 import { build_getter } from '../utils.js';
@@ -685,14 +685,13 @@ function build_element_special_value_attribute(element, node_id, attribute, cont
 			: value
 	);
 
+	const evaluated = context.state.scope.evaluate(value);
+	const assignment = b.assignment('=', b.member(node_id, '__value'), value);
+
 	const inner_assignment = b.assignment(
 		'=',
 		b.member(node_id, 'value'),
-		b.conditional(
+		evaluated.is_defined ? assignment : b.logical('??', assignment, b.literal(''))
-			b.binary('==', b.null, b.assignment('=', b.member(node_id, '__value'), value)),
-			b.literal(''), // render null/undefined values as empty string to support placeholder options
-			value
-		)
 	);
 
 	const update = b.stmt(

packages/svelte/src/compiler/phases/3-transform/client/visitors/RenderTag.js

@@ -2,7 +2,7 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
 import { unwrap_optional } from '../../../../utils/ast.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.RenderTag} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/SlotElement.js

@@ -1,7 +1,7 @@
 /** @import { BlockStatement, Expression, ExpressionStatement, Literal, Property } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_attribute_value } from './shared/element.js';
 import { memoize_expression } from './shared/utils.js';
 

packages/svelte/src/compiler/phases/3-transform/client/visitors/SnippetBlock.js

@@ -3,7 +3,7 @@
 /** @import { ComponentContext } from '../types' */
 import { dev } from '../../../../state.js';
 import { extract_paths } from '../../../../utils/ast.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { get_value } from './shared/declarations.js';
 
 /**
@@ -21,6 +21,10 @@ export function SnippetBlock(node, context) {
 	/** @type {Statement[]} */
 	const declarations = [];
 
+	if (dev) {
+		declarations.push(b.stmt(b.call('$.validate_snippet_args', b.spread(b.id('arguments')))));
+	}
+
 	const transform = { ...context.state.transform };
 	const child_state = { ...context.state, transform };
 
@@ -30,12 +34,7 @@ export function SnippetBlock(node, context) {
 		if (!argument) continue;
 
 		if (argument.type === 'Identifier') {
-			args.push({
+			args.push(b.assignment_pattern(argument, b.id('$.noop')));
-				type: 'AssignmentPattern',
-				left: argument,
-				right: b.id('$.noop')
-			});
-
 			transform[argument.name] = { read: b.call };
 
 			continue;
@@ -66,29 +65,16 @@ export function SnippetBlock(node, context) {
 			}
 		}
 	}
-	if (dev) {
+
-		declarations.unshift(
-			b.stmt(
-				b.call(
-					'$.validate_snippet_args',
-					.../** @type {Identifier[]} */ (
-						args.map((arg) => (arg?.type === 'Identifier' ? arg : arg?.left))
-					)
-				)
-			)
-		);
-	}
 	body = b.block([
 		...declarations,
 		.../** @type {BlockStatement} */ (context.visit(node.body, child_state)).body
 	]);
 
-	/** @type {Expression} */
+	// in dev we use a FunctionExpression (not arrow function) so we can use `arguments`
-	let snippet = b.arrow(args, body);
+	let snippet = dev
-
+		? b.call('$.wrap_snippet', b.id(context.state.analysis.name), b.function(null, args, body))
-	if (dev) {
+		: b.arrow(args, body);
-		snippet = b.call('$.wrap_snippet', b.id(context.state.analysis.name), snippet);
-	}
 
 	const declaration = b.const(node.expression, snippet);
 

packages/svelte/src/compiler/phases/3-transform/client/visitors/SvelteBoundary.js

@@ -2,7 +2,7 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
 import { dev } from '../../../../state.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.SvelteBoundary} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/SvelteElement.js

@@ -3,10 +3,10 @@
 /** @import { ComponentContext } from '../types' */
 import { dev, locator } from '../../../../state.js';
 import { is_text_attribute } from '../../../../utils/ast.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { determine_namespace_for_children } from '../../utils.js';
 import { build_attribute_value, build_set_attributes, build_set_class } from './shared/element.js';
-import { build_render_statement, get_expression_id } from './shared/utils.js';
+import { build_render_statement } from './shared/utils.js';
 
 /**
  * @param {AST.SvelteElement} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/SvelteHead.js

@@ -1,7 +1,7 @@
 /** @import { BlockStatement } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.SvelteHead} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/TitleElement.js

@@ -1,6 +1,6 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_template_chunk } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/client/visitors/TransitionDirective.js

@@ -2,7 +2,7 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
 import { TRANSITION_GLOBAL, TRANSITION_IN, TRANSITION_OUT } from '../../../../../constants.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { parse_directive_name } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/client/visitors/UpdateExpression.js

@@ -1,7 +1,7 @@
 /** @import { AssignmentExpression, Expression, UpdateExpression } from 'estree' */
 /** @import { Context } from '../types' */
 import { object } from '../../../../utils/ast.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { validate_mutation } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/client/visitors/UseDirective.js

@@ -1,7 +1,7 @@
 /** @import { Expression } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { parse_directive_name } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/client/visitors/VariableDeclaration.js

@@ -3,7 +3,7 @@
 /** @import { ComponentClientTransformState, ComponentContext } from '../types' */
 import { dev } from '../../../../state.js';
 import { extract_paths } from '../../../../utils/ast.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import * as assert from '../../../../utils/assert.js';
 import { get_rune } from '../../../scope.js';
 import { get_prop_source, is_prop_source, is_state_source, should_proxy } from '../utils.js';

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/component.js

@@ -3,7 +3,7 @@
 /** @import { ComponentContext } from '../../types.js' */
 import { dev, is_ignored } from '../../../../../state.js';
 import { get_attribute_chunks, object } from '../../../../../utils/ast.js';
-import * as b from '../../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_bind_this, memoize_expression, validate_binding } from '../shared/utils.js';
 import { build_attribute_value } from '../shared/element.js';
 import { build_event_handler } from './events.js';

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/declarations.js

@@ -1,7 +1,7 @@
 /** @import { Identifier } from 'estree' */
 /** @import { ComponentContext, Context } from '../../types' */
 import { is_state_source } from '../../utils.js';
-import * as b from '../../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * Turns `foo` into `$.get(foo)`

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/element.js

@@ -1,11 +1,11 @@
 /** @import { ArrayExpression, Expression, Identifier, ObjectExpression } from 'estree' */
 /** @import { AST, ExpressionMetadata } from '#compiler' */
-/** @import { ComponentClientTransformState, ComponentContext } from '../../types' */
+/** @import { ComponentContext } from '../../types' */
 import { escape_html } from '../../../../../../escaping.js';
 import { normalize_attribute } from '../../../../../../utils.js';
 import { is_ignored } from '../../../../../state.js';
 import { is_event_attribute } from '../../../../../utils/ast.js';
-import * as b from '../../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_class_directives_object, build_style_directives_object } from '../RegularElement.js';
 import { build_template_chunk, get_expression_id } from './utils.js';
 

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/events.js

@@ -3,7 +3,7 @@
 /** @import { ComponentContext } from '../../types' */
 import { is_capture_event, is_passive_event } from '../../../../../../utils.js';
 import { dev, locator } from '../../../../../state.js';
-import * as b from '../../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.Attribute} node

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/fragment.js

@@ -3,7 +3,7 @@
 /** @import { ComponentContext } from '../../types' */
 import { cannot_be_set_statically } from '../../../../../../utils.js';
 import { is_event_attribute, is_text_attribute } from '../../../../../utils/ast.js';
-import * as b from '../../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { is_custom_element_node } from '../../../../nodes.js';
 import { build_template_chunk } from './utils.js';
 

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/special_element.js

@@ -1,7 +1,7 @@
 /** @import { Expression } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../../types' */
-import * as b from '../../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  *

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js

@@ -3,7 +3,7 @@
 /** @import { ComponentClientTransformState, Context } from '../../types' */
 import { walk } from 'zimmerframe';
 import { object } from '../../../../../utils/ast.js';
-import * as b from '../../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { sanitize_template_string } from '../../../../../utils/sanitize_template_string.js';
 import { regex_is_valid_identifier } from '../../../../patterns.js';
 import is_reference from 'is-reference';
@@ -89,21 +89,21 @@ export function build_template_chunk(
 				}
 			}
 
-			const is_defined =
+			const evaluated = state.scope.evaluate(value);
-				value.type === 'BinaryExpression' ||
-				(value.type === 'UnaryExpression' && value.operator !== 'void') ||
-				(value.type === 'LogicalExpression' && value.right.type === 'Literal') ||
-				(value.type === 'Identifier' && value.name === state.analysis.props_id?.name);
 
-			if (!is_defined) {
+			if (evaluated.is_known) {
-				// add `?? ''` where necessary (TODO optimise more cases)
+				quasi.value.cooked += evaluated.value + '';
-				value = b.logical('??', value, b.literal(''));
+			} else {
-			}
+				if (!evaluated.is_defined) {
+					// add `?? ''` where necessary
+					value = b.logical('??', value, b.literal(''));
+				}
 
-			expressions.push(value);
+				expressions.push(value);
 
-			quasi = b.quasi('', i + 1 === values.length);
+				quasi = b.quasi('', i + 1 === values.length);
-			quasis.push(quasi);
+				quasis.push(quasi);
+			}
 		}
 	}
 

packages/svelte/src/compiler/phases/3-transform/css/index.js

@@ -170,7 +170,11 @@ const visitors = {
 		if (node.metadata.is_global_block) {
 			const selector = node.prelude.children[0];
 
-			if (selector.children.length === 1 && selector.children[0].selectors.length === 1) {
+			if (
+				node.prelude.children.length === 1 &&
+				selector.children.length === 1 &&
+				selector.children[0].selectors.length === 1
+			) {
 				// `:global {...}`
 				if (state.minify) {
 					state.code.remove(node.start, node.block.start + 1);
@@ -194,7 +198,7 @@ const visitors = {
 	SelectorList(node, { state, next, path }) {
 		// Only add comments if we're not inside a complex selector that itself is unused or a global block
 		if (
-			!is_in_global_block(path) &&
+			(!is_in_global_block(path) || node.children.length > 1) &&
 			!path.find((n) => n.type === 'ComplexSelector' && !n.metadata.used)
 		) {
 			const children = node.children;
@@ -282,13 +286,24 @@ const visitors = {
 				const global = /** @type {AST.CSS.PseudoClassSelector} */ (relative_selector.selectors[0]);
 				remove_global_pseudo_class(global, relative_selector.combinator, context.state);
 
-				if (
+				const parent_rule = node.metadata.rule?.metadata.parent_rule;
-					node.metadata.rule?.metadata.parent_rule &&
+				if (parent_rule && global.args === null) {
-					global.args === null &&
+					if (relative_selector.combinator === null) {
-					relative_selector.combinator === null
+						// div { :global.x { ... } } becomes div { &.x { ... } }
-				) {
+						context.state.code.prependRight(global.start, '&');
-					// div { :global.x { ... } } becomes div { &.x { ... } }
+					}
-					context.state.code.prependRight(global.start, '&');
+
+					// In case of multiple :global selectors in a selector list we gotta delete the comma, too, but only if
+					// the next selector is used; if it's unused then the comma deletion happens as part of removal of that next selector
+					if (
+						parent_rule.prelude.children.length > 1 &&
+						node.children.length === node.children.findIndex((s) => s === relative_selector) - 1
+					) {
+						const next_selector = parent_rule.prelude.children.find((s) => s.start > global.end);
+						if (next_selector && next_selector.metadata.used) {
+							context.state.code.update(global.end, next_selector.start, '');
+						}
+					}
 				}
 				continue;
 			} else {
@@ -380,7 +395,9 @@ function remove_global_pseudo_class(selector, combinator, state) {
 			// div :global.x becomes div.x
 			while (/\s/.test(state.code.original[start - 1])) start--;
 		}
-		state.code.remove(start, selector.start + ':global'.length);
+
+		// update(...), not remove(...) because there could be a closing unused comment at the end
+		state.code.update(start, selector.start + ':global'.length, '');
 	} else {
 		state.code
 			.remove(selector.start, selector.start + ':global('.length)

packages/svelte/src/compiler/phases/3-transform/server/transform-server.js

@@ -5,7 +5,7 @@
 import { walk } from 'zimmerframe';
 import { set_scope } from '../../scope.js';
 import { extract_identifiers } from '../../../utils/ast.js';
-import * as b from '../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { dev, filename } from '../../../state.js';
 import { render_stylesheet } from '../css/index.js';
 import { AssignmentExpression } from './visitors/AssignmentExpression.js';

packages/svelte/src/compiler/phases/3-transform/server/visitors/AssignmentExpression.js

@@ -1,7 +1,7 @@
 /** @import { AssignmentExpression, AssignmentOperator, Expression, Pattern } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { Context, ServerTransformState } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_assignment_value } from '../../../../utils/ast.js';
 import { visit_assignment_expression } from '../../shared/assignments.js';
 

packages/svelte/src/compiler/phases/3-transform/server/visitors/AwaitBlock.js

@@ -1,7 +1,7 @@
 /** @import { BlockStatement, Expression, Pattern } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { block_close } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/CallExpression.js

@@ -1,7 +1,7 @@
 /** @import { CallExpression, Expression } from 'estree' */
 /** @import { Context } from '../types.js' */
 import { is_ignored } from '../../../../state.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { get_rune } from '../../../scope.js';
 import { transform_inspect_rune } from '../../utils.js';
 

packages/svelte/src/compiler/phases/3-transform/server/visitors/ClassBody.js

@@ -2,7 +2,7 @@
 /** @import { Context } from '../types.js' */
 /** @import { StateField } from '../../client/types.js' */
 import { dev } from '../../../../state.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { get_rune } from '../../../scope.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/Component.js

@@ -1,6 +1,6 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_inline_component } from './shared/component.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/ConstTag.js

@@ -1,7 +1,7 @@
 /** @import { Expression, Pattern } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.ConstTag} node

packages/svelte/src/compiler/phases/3-transform/server/visitors/DebugTag.js

@@ -1,7 +1,7 @@
 /** @import { Expression } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.DebugTag} node

packages/svelte/src/compiler/phases/3-transform/server/visitors/EachBlock.js

@@ -1,8 +1,8 @@
-/** @import { BlockStatement, Expression, Pattern, Statement } from 'estree' */
+/** @import { BlockStatement, Expression, Statement } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
 import { BLOCK_OPEN_ELSE } from '../../../../../internal/server/hydration.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { block_close, block_open } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/ExpressionStatement.js

@@ -1,6 +1,6 @@
 /** @import { ExpressionStatement } from 'estree' */
 /** @import { Context } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { get_rune } from '../../../scope.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/Fragment.js

@@ -1,7 +1,7 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext, ComponentServerTransformState } from '../types.js' */
 import { clean_nodes, infer_namespace } from '../../utils.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { empty_comment, process_children, build_template } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/HtmlTag.js

@@ -1,7 +1,7 @@
 /** @import { Expression } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.HtmlTag} node

packages/svelte/src/compiler/phases/3-transform/server/visitors/Identifier.js

@@ -1,7 +1,7 @@
 /** @import { Identifier, Node } from 'estree' */
 /** @import { Context } from '../types.js' */
 import is_reference from 'is-reference';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_getter } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/IfBlock.js

@@ -1,8 +1,8 @@
-/** @import { BlockStatement, Expression, IfStatement } from 'estree' */
+/** @import { BlockStatement, Expression } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
 import { BLOCK_OPEN_ELSE } from '../../../../../internal/server/hydration.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { block_close, block_open } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/LabeledStatement.js

@@ -1,6 +1,6 @@
 /** @import { ExpressionStatement, LabeledStatement } from 'estree' */
 /** @import { Context } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {LabeledStatement} node

packages/svelte/src/compiler/phases/3-transform/server/visitors/MemberExpression.js

@@ -1,6 +1,6 @@
 /** @import { MemberExpression } from 'estree' */
 /** @import { Context } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {MemberExpression} node

packages/svelte/src/compiler/phases/3-transform/server/visitors/PropertyDefinition.js

@@ -1,6 +1,6 @@
 /** @import { Expression, PropertyDefinition } from 'estree' */
 /** @import { Context } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { get_rune } from '../../../scope.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/RegularElement.js

@@ -4,7 +4,7 @@
 /** @import { Scope } from '../../../scope.js' */
 import { is_void } from '../../../../../utils.js';
 import { dev, locator } from '../../../../state.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { clean_nodes, determine_namespace_for_children } from '../../utils.js';
 import { build_element_attributes } from './shared/element.js';
 import { process_children, build_template } from './shared/utils.js';

packages/svelte/src/compiler/phases/3-transform/server/visitors/RenderTag.js

@@ -2,7 +2,7 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
 import { unwrap_optional } from '../../../../utils/ast.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { empty_comment } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/SlotElement.js

@@ -1,7 +1,7 @@
 /** @import { BlockStatement, Expression, Literal, Property } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { empty_comment, build_attribute_value } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/SnippetBlock.js

@@ -1,28 +1,35 @@
-/** @import { BlockStatement } from 'estree' */
+/** @import { ArrowFunctionExpression, BlockStatement, CallExpression } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
 import { dev } from '../../../../state.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.SnippetBlock} node
  * @param {ComponentContext} context
  */
 export function SnippetBlock(node, context) {
-	const fn = b.function_declaration(
+	const body = /** @type {BlockStatement} */ (context.visit(node.body));
-		node.expression,
+
-		[b.id('$$payload'), ...node.parameters],
-		/** @type {BlockStatement} */ (context.visit(node.body))
-	);
 	if (dev) {
-		fn.body.body.unshift(b.stmt(b.call('$.validate_snippet_args', b.id('$$payload'))));
+		body.body.unshift(b.stmt(b.call('$.validate_snippet_args', b.id('$$payload'))));
 	}
+
+	/** @type {ArrowFunctionExpression | CallExpression} */
+	let fn = b.arrow([b.id('$$payload'), ...node.parameters], body);
+
+	if (dev) {
+		fn = b.call('$.prevent_snippet_stringification', fn);
+	}
+
+	const declaration = b.declaration('const', [b.declarator(node.expression, fn)]);
+
 	// @ts-expect-error - TODO remove this hack once $$render_inner for legacy bindings is gone
 	fn.___snippet = true;
 
 	if (node.metadata.can_hoist) {
-		context.state.hoisted.push(fn);
+		context.state.hoisted.push(declaration);
 	} else {
-		context.state.init.push(fn);
+		context.state.init.push(declaration);
 	}
 }

packages/svelte/src/compiler/phases/3-transform/server/visitors/SvelteBoundary.js

@@ -2,7 +2,7 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types' */
 import { BLOCK_CLOSE, BLOCK_OPEN } from '../../../../../internal/server/hydration.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.SvelteBoundary} node

packages/svelte/src/compiler/phases/3-transform/server/visitors/SvelteElement.js

@@ -3,7 +3,7 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
 import { dev, locator } from '../../../../state.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { determine_namespace_for_children } from '../../utils.js';
 import { build_element_attributes } from './shared/element.js';
 import { build_template } from './shared/utils.js';

packages/svelte/src/compiler/phases/3-transform/server/visitors/SvelteHead.js

@@ -1,7 +1,7 @@
 /** @import { BlockStatement } from 'estree' */
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {AST.SvelteHead} node

packages/svelte/src/compiler/phases/3-transform/server/visitors/SvelteSelf.js

@@ -1,6 +1,6 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { build_inline_component } from './shared/component.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/TitleElement.js

@@ -1,6 +1,6 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { process_children, build_template } from './shared/utils.js';
 
 /**

packages/svelte/src/compiler/phases/3-transform/server/visitors/UpdateExpression.js

@@ -1,6 +1,6 @@
 /** @import { UpdateExpression } from 'estree' */
 /** @import { Context } from '../types.js' */
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 
 /**
  * @param {UpdateExpression} node

packages/svelte/src/compiler/phases/3-transform/server/visitors/VariableDeclaration.js

@@ -3,7 +3,7 @@
 /** @import { Context } from '../types.js' */
 /** @import { Scope } from '../../../scope.js' */
 import { build_fallback, extract_paths } from '../../../../utils/ast.js';
-import * as b from '../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { get_rune } from '../../../scope.js';
 import { walk } from 'zimmerframe';
 

packages/svelte/src/compiler/phases/3-transform/server/visitors/shared/component.js

@@ -2,8 +2,9 @@
 /** @import { AST } from '#compiler' */
 /** @import { ComponentContext } from '../../types.js' */
 import { empty_comment, build_attribute_value } from './utils.js';
-import * as b from '../../../../../utils/builders.js';
+import * as b from '#compiler/builders';
 import { is_element_node } from '../../../../nodes.js';
+import { dev } from '../../../../../state.js';
 
 /**
  * @param {AST.Component | AST.SvelteComponent | AST.SvelteSelf} node
@@ -238,7 +239,13 @@ export function build_inline_component(node, expression, context) {
 				)
 			) {
 				// create `children` prop...
-				push_prop(b.prop('init', b.id('children'), slot_fn));
+				push_prop(
+					b.prop(
+						'init',
+						b.id('children'),
+						dev ? b.call('$.prevent_snippet_stringification', slot_fn) : slot_fn
+					)
+				);
 
 				// and `$$slots.default: true` so that `<slot>` on the child works
 				serialized_slots.push(b.init(slot_name, b.true));