svelte - npm Package Compare versions

Comparing version 5.55.10 to 5.56.0

src/compiler/phases/2-analyze/visitors/DeclarationTag.js

+/** @import { AST } from '#compiler' */
+/** @import { Context } from '../types' */
+import * as b from '#compiler/builders';
+import * as e from '../../../errors.js';
+import { validate_opening_tag } from './shared/utils.js';
+
+/**
+ * @param {AST.DeclarationTag} node
+ * @param {Context} context
+ */
+export function DeclarationTag(node, context) {
+	validate_opening_tag(node, context.state, node.declaration.kind[0]);
+	if (!context.state.analysis.runes && !context.state.analysis.maybe_runes) {
+		e.declaration_tag_no_legacy_mode(node);
+	}
+
+	context.visit(node.declaration, {
+		...context.state,
+		in_declaration_tag: true,
+		expression: node.metadata.expression
+	});
+
+	mark_async_declaration(context, node.metadata, node.declaration.declarations);
+}
+
+/**
+ * @param {Context} context
+ * @param {AST.ConstTag['metadata'] | AST.DeclarationTag['metadata']} metadata
+ * @param {import('estree').VariableDeclarator[]} declarations
+ */
+export function mark_async_declaration(context, metadata, declarations) {
+	const has_await = metadata.expression.has_await;
+	const blockers = [...metadata.expression.dependencies]
+		.map((dep) => dep.blocker)
+		.filter((b) => b !== null && b.object !== context.state.async_consts?.id);
+
+	if (has_await || context.state.async_consts || blockers.length > 0) {
+		const run = (context.state.async_consts ??= {
+			id: context.state.analysis.root.unique('promises'),
+			declaration_count: 0
+		});
+		metadata.promises_id = run.id;
+
+		const bindings = declarations.flatMap((declaration) =>
+			context.state.scope.get_bindings(declaration)
+		);
+
+		// keep the counter in sync with the number of thunks pushed in transform
+		// TODO 6.0 once non-async and non-runes mode is gone investigate making this more robust
+		// via something like the approach in https://github.com/sveltejs/svelte/pull/18032
+		const length = run.declaration_count + (blockers.length > 0 ? 1 : 0);
+		run.declaration_count += blockers.length > 0 ? 2 : 1;
+		const blocker = b.member(run.id, b.literal(length), true);
+		for (const binding of bindings) {
+			binding.blocker = blocker;
+		}
+	}
+}

src/compiler/phase...sform/client/visitors/DeclarationTag.js

+/** @import { Expression, Identifier, Pattern, Statement, ExpressionStatement, VariableDeclaration } from 'estree' */
+/** @import { AST } from '#compiler' */
+/** @import { ComponentContext } from '../types' */
+import { extract_identifiers, has_await_expression } from '../../../../utils/ast.js';
+import * as b from '#compiler/builders';
+import { add_state_transformers } from './shared/declarations.js';
+
+/**
+ * @param {AST.DeclarationTag} node
+ * @param {ComponentContext} context
+ */
+export function DeclarationTag(node, context) {
+	const declaration = /** @type {Statement | undefined} */ (context.visit(node.declaration));
+	add_state_transformers(context);
+
+	if (
+		node.metadata.promises_id &&
+		node.declaration.type === 'VariableDeclaration' &&
+		declaration?.type === 'VariableDeclaration'
+	) {
+		const { ids, assignments } = build_async_declaration_parts(declaration);
+		add_async_declaration(context, node.metadata, ids, assignments, declaration.kind);
+	} else {
+		context.state.consts.push(declaration ?? node.declaration);
+	}
+}
+
+/**
+ * @param {VariableDeclaration} declaration
+ */
+export function build_async_declaration_parts(declaration) {
+	const ids = new Map();
+	for (const declarator of declaration.declarations) {
+		for (const id of extract_identifiers(declarator.id)) {
+			ids.set(id.name, id);
+		}
+	}
+
+	const assignments = declaration.declarations
+		.filter((declarator) => declarator.init !== null)
+		.map((declarator) =>
+			b.stmt(
+				b.assignment(
+					'=',
+					/** @type {Pattern} */ (declarator.id),
+					/** @type {Expression} */ (declarator.init)
+				)
+			)
+		);
+
+	return { ids: [...ids.values()], assignments };
+}
+
+/**
+ * @param {ComponentContext} context
+ * @param {AST.ConstTag['metadata'] | AST.DeclarationTag['metadata']} metadata
+ * @param {Identifier[]} ids
+ * @param {ExpressionStatement[]} assignments
+ * @param {VariableDeclaration['kind']} [kind]
+ */
+export function add_async_declaration(context, metadata, ids, assignments, kind = 'let') {
+	const run = (context.state.async_consts ??= {
+		id: /** @type {Identifier} */ (metadata.promises_id),
+		thunks: []
+	});
+
+	for (const id of ids) {
+		context.state.consts.push(kind === 'var' ? b.var(id.name) : b.let(id.name));
+	}
+
+	const blockers = [...metadata.expression.dependencies]
+		.map((dep) => dep.blocker)
+		.filter((b) => b !== null && b.object !== context.state.async_consts?.id);
+
+	if (blockers.length === 1) {
+		run.thunks.push(b.thunk(b.member(/** @type {Expression} */ (blockers[0]), 'promise')));
+	} else if (blockers.length > 0) {
+		run.thunks.push(b.thunk(b.call('$.wait', b.array(blockers))));
+	}
+
+	// keep the number of thunks pushed in sync with analysis phase
+	const has_await =
+		metadata.expression.has_await ||
+		assignments.some((assignment) => has_await_expression(assignment));
+	const body = assignments.length === 1 ? assignments[0].expression : b.block(assignments);
+	run.thunks.push(b.thunk(body, has_await));
+}

src/compiler/phase...sform/server/visitors/DeclarationTag.js

+/** @import { Expression, Identifier, Pattern, Statement, ExpressionStatement, VariableDeclaration } from 'estree' */
+/** @import { AST } from '#compiler' */
+/** @import { ComponentContext } from '../types.js' */
+import { extract_identifiers, has_await_expression } from '../../../../utils/ast.js';
+import * as b from '#compiler/builders';
+
+/**
+ * @param {AST.DeclarationTag} node
+ * @param {ComponentContext} context
+ */
+export function DeclarationTag(node, context) {
+	const declaration = /** @type {Statement} */ (context.visit(node.declaration));
+
+	if (
+		node.metadata.promises_id &&
+		node.declaration.type === 'VariableDeclaration' &&
+		declaration.type === 'VariableDeclaration'
+	) {
+		const { ids, assignments } = build_async_declaration_parts(declaration);
+		add_async_declaration(context, node.metadata, ids, assignments, declaration.kind);
+	} else {
+		context.state.init.push(declaration);
+	}
+}
+
+/**
+ * @param {VariableDeclaration} declaration
+ */
+export function build_async_declaration_parts(declaration) {
+	const ids = new Map();
+	for (const declarator of declaration.declarations) {
+		for (const id of extract_identifiers(declarator.id)) {
+			ids.set(id.name, id);
+		}
+	}
+
+	const assignments = declaration.declarations
+		.filter((declarator) => declarator.init !== null)
+		.map((declarator) =>
+			b.stmt(
+				b.assignment(
+					'=',
+					/** @type {Pattern} */ (declarator.id),
+					/** @type {Expression} */ (declarator.init)
+				)
+			)
+		);
+
+	return { ids: [...ids.values()], assignments };
+}
+
+/**
+ * @param {ComponentContext} context
+ * @param {AST.ConstTag['metadata'] | AST.DeclarationTag['metadata']} metadata
+ * @param {Identifier[]} ids
+ * @param {ExpressionStatement[]} assignments
+ * @param {VariableDeclaration['kind']} [kind]
+ */
+export function add_async_declaration(context, metadata, ids, assignments, kind = 'let') {
+	const run = (context.state.async_consts ??= {
+		id: /** @type {Identifier} */ (metadata.promises_id),
+		thunks: []
+	});
+
+	for (const id of ids) {
+		context.state.init.push(kind === 'var' ? b.var(id.name) : b.let(id.name));
+	}
+
+	const blockers = [...metadata.expression.dependencies]
+		.map((dep) => dep.blocker)
+		.filter((b) => b !== null && b.object !== context.state.async_consts?.id);
+
+	if (blockers.length === 1) {
+		run.thunks.push(b.thunk(/** @type {Expression} */ (blockers[0])));
+	} else if (blockers.length > 0) {
+		run.thunks.push(b.thunk(b.call('Promise.all', b.array(blockers))));
+	}
+
+	// keep the number of thunks pushed in sync with analysis phase
+	const has_await =
+		metadata.expression.has_await ||
+		assignments.some((assignment) => has_await_expression(assignment));
+	const body = assignments.length === 1 ? assignments[0].expression : b.block(assignments);
+	run.thunks.push(b.thunk(body, has_await));
+}

package.json

@@ -5,3 +5,3 @@ {
   "license": "MIT",
-  "version": "5.55.10",
+  "version": "5.56.0",
   "type": "module",
@@ -143,3 +143,3 @@ "types": "./types/index.d.ts",
     "@jridgewell/trace-mapping": "^0.3.25",
-    "@playwright/test": "^1.58.0",
+    "@playwright/test": "^1.60.0",
     "@rollup/plugin-commonjs": "^28.0.1",
@@ -151,2 +151,3 @@ "@rollup/plugin-node-resolve": "^15.3.0",
     "@types/node": "^20.11.5",
+    "baseline-browser-mapping": "^2.10.32",
     "dts-buddy": "^0.5.5",
@@ -158,3 +159,4 @@ "esbuild": "^0.25.10",
     "typescript": "^5.5.4",
-    "vitest": "^2.1.9"
+    "vitest": "^2.1.9",
+    "web-features": "^3.29.0"
   },
@@ -185,7 +187,8 @@ "dependencies": {
     "check:watch": "tsc --watch",
-    "generate": "node scripts/process-messages && node ./scripts/generate-types.js",
+    "generate": "node scripts/process-messages && node ./scripts/generate-types.js && pnpm generate:browser-support",
     "generate:version": "node ./scripts/generate-version.js",
     "generate:types": "node ./scripts/generate-types.js && tsc -p tsconfig.generated.json",
+    "generate:browser-support": "node ./scripts/generate-browser-support.ts",
     "knip": "pnpm dlx knip"
   }
 }

src/compiler/legacy.js

@@ -265,2 +265,6 @@ /** @import { Expression } from 'estree' */
 			// @ts-ignore
+			DeclarationTag(node) {
+				return node;
+			},
+			// @ts-ignore
 			KeyBlock(node, { visit }) {
@@ -267,0 +271,0 @@ remove_surrounding_whitespace_nodes(node.fragment.nodes);

src/compiler/phases/1-parse/acorn.js

@@ -1,2 +0,2 @@
-/** @import { Comment, Program } from 'estree' */
+/** @import { Comment, Program, Statement } from 'estree' */
 /** @import { AST } from '#compiler' */
@@ -8,2 +8,3 @@ /** @import { Parser } from './index.js' */
 import * as e from '../../errors.js';
+import { find_matching_bracket } from './utils/bracket.js';
 
@@ -102,2 +103,44 @@ const JSParser = acorn.Parser;
 
+/**
+ * @param {Parser} parser
+ * @param {string} source
+ * @param {number} index
+ * @returns {Statement}
+ */
+export function parse_statement_at(parser, source, index) {
+	const acorn = parser.ts ? TSParser : JSParser;
+	let end = find_matching_bracket(source, index, '{');
+	if (end === undefined) e.unexpected_eof(source.length);
+
+	while (source[end - 1] === ';') {
+		end -= 1;
+	}
+
+	const padded_source = `${' '.repeat(index)}${source.slice(index, end)}`;
+	const { onComment, add_comments } = get_comment_handlers(
+		padded_source,
+		parser.root.comments,
+		index
+	);
+
+	try {
+		const ast = acorn.parse(padded_source, {
+			onComment,
+			sourceType: 'module',
+			ecmaVersion: 16,
+			locations: true
+		});
+
+		add_comments(ast);
+
+		const statement = /** @type {Statement} */ (
+			/** @type {unknown} */ (/** @type {Program} */ (ast).body[0])
+		);
+		statement.end = Math.min(/** @type {number} */ (statement.end), end);
+		return statement;
+	} catch (e) {
+		handle_parse_error(e);
+	}
+}
+
 const regex_position_indicator = / \(\d+:\d+\)$/;
@@ -104,0 +147,0 @@

src/compiler/phases/1-parse/index.js

@@ -305,3 +305,6 @@ /** @import { AST } from '#compiler' */
 	pop() {
-		this.fragments.pop();
+		const fragment = this.fragments.pop();
+		if (fragment?.metadata.transparent && fragment.nodes.some((n) => n.type === 'DeclarationTag')) {
+			fragment.metadata.transparent = false;
+		}
 		return this.stack.pop();
@@ -308,0 +311,0 @@ }

src/compiler/phases/1-parse/state/tag.js

@@ -1,2 +0,2 @@
-/** @import { ArrowFunctionExpression, Expression, Identifier, Pattern } from 'estree' */
+/** @import { ArrowFunctionExpression, Expression, Identifier, Pattern, VariableDeclaration } from 'estree' */
 /** @import { AST } from '#compiler' */
@@ -7,9 +7,13 @@ /** @import { Parser } from '../index.js' */
 import { ExpressionMetadata } from '../../nodes.js';
-import { parse_expression_at } from '../acorn.js';
+import { parse_expression_at, parse_statement_at } from '../acorn.js';
 import read_pattern from '../read/context.js';
 import read_expression, { get_loose_identifier } from '../read/expression.js';
 import { create_fragment } from '../utils/create.js';
-import { match_bracket } from '../utils/bracket.js';
+import { find_matching_bracket, match_bracket } from '../utils/bracket.js';
 
 const regex_whitespace_with_closing_curly_brace = /\s*}/y;
+const regex_supported_declaration = /(?:let|const)\b/y;
+// All except `type` are reserved keywords and cannot be used as variable names.
+// For type we check if it's not something like `type .x` / `type ()` / `type % 2` / ...
+const regex_unsupported_declaration = /(?:(?:var|interface|enum)\b)|(?:type\s+[^?.(`<[&|%^}])/y;
 
@@ -35,2 +39,16 @@ const pointy_bois = { '<': '>' };
 
+	const declaration = read_declaration(parser);
+	if (declaration) {
+		parser.append({
+			type: 'DeclarationTag',
+			start,
+			end: parser.index,
+			declaration: /** @type {VariableDeclaration} */ (declaration),
+			metadata: {
+				expression: new ExpressionMetadata()
+			}
+		});
+		return;
+	}
+
 	const expression = read_expression(parser);
@@ -52,2 +70,72 @@
 
+/**
+ * @param {Parser} parser
+ * @returns {null | import('estree').VariableDeclaration}
+ */
+function read_declaration(parser) {
+	const start = parser.index;
+
+	const unsupported = parser.match_regex(regex_unsupported_declaration);
+	if (unsupported) {
+		e.declaration_tag_invalid_type({ start, end: start + unsupported.length });
+	}
+
+	if (!parser.match_regex(regex_supported_declaration)) {
+		return null;
+	}
+
+	/** @type {import('estree').Statement | import('estree').VariableDeclaration} */
+	let declaration;
+	try {
+		declaration = parse_statement_at(parser, parser.template, start);
+	} catch (error) {
+		if (!parser.loose) throw error;
+
+		const end = find_matching_bracket(parser.template, start, '{');
+		if (end === undefined) throw error;
+
+		parser.index = end;
+		const kind = parser.template.startsWith('const', start) ? 'const' : 'let';
+
+		declaration = {
+			type: 'VariableDeclaration',
+			kind,
+			declarations: [
+				{
+					type: 'VariableDeclarator',
+					id: {
+						type: 'Identifier',
+						name: '',
+						start: parser.index,
+						end: parser.index
+					},
+					init: null,
+					start: parser.index,
+					end: parser.index
+				}
+			],
+			start,
+			end
+		};
+	}
+
+	if (declaration.type !== 'VariableDeclaration') {
+		e.declaration_tag_invalid_type({
+			start: declaration.start ?? start,
+			end: declaration.end ?? parser.index
+		});
+	}
+
+	// TODO support using
+	if (declaration.kind !== 'let' && declaration.kind !== 'const') {
+		e.declaration_tag_invalid_type(declaration);
+	}
+
+	parser.index = /** @type {number} */ (declaration.end);
+	parser.allow_whitespace();
+	parser.eat('}', true);
+
+	return declaration;
+}
+
 /** @param {Parser} parser */
@@ -54,0 +142,0 @@ function open(parser) {

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

@@ -39,2 +39,3 @@ /** @import * as ESTree from 'estree' */
 import { ConstTag } from './visitors/ConstTag.js';
+import { DeclarationTag } from './visitors/DeclarationTag.js';
 import { DebugTag } from './visitors/DebugTag.js';
@@ -161,2 +162,3 @@ import { EachBlock } from './visitors/EachBlock.js';
 	ConstTag,
+	DeclarationTag,
 	DebugTag,
@@ -317,2 +319,3 @@ EachBlock,
 			parent_element: null,
+			in_declaration_tag: false,
 			reactive_statement: null,
@@ -724,2 +727,3 @@ derived_function_depth: -1
 				parent_element: null,
+				in_declaration_tag: false,
 				has_props_rune: false,
@@ -792,2 +796,3 @@ component_slots: new Set(),
 				parent_element: null,
+				in_declaration_tag: false,
 				has_props_rune: false,
@@ -794,0 +799,0 @@ ast_type: ast === instance.ast ? 'instance' : ast === template.ast ? 'template' : 'module',

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

@@ -258,2 +258,5 @@ /** @import { ArrowFunctionExpression, CallExpression, Expression, FunctionDeclaration, FunctionExpression, Identifier, VariableDeclarator } from 'estree' */
 		}
+
+		// Tell surrounding declaration tag about metadata for correct calculation of blockers etc
+		if (context.state.in_declaration_tag) context.state.expression?.merge(expression);
 	} else if (rune === '$inspect') {
@@ -260,0 +263,0 @@ context.next({ ...context.state, function_depth: context.state.function_depth + 1 });

src/compiler/phases/2-analyze/visitors/ConstTag.js

 /** @import { AST } from '#compiler' */
 /** @import { Context } from '../types' */
 import * as e from '../../../errors.js';
-import * as b from '#compiler/builders';
 import { validate_opening_tag } from './shared/utils.js';
+import { mark_async_declaration } from './DeclarationTag.js';
 
@@ -47,26 +47,3 @@ /**
 
-	const has_await = node.metadata.expression.has_await;
-	const blockers = [...node.metadata.expression.dependencies]
-		.map((dep) => dep.blocker)
-		.filter((b) => b !== null && b.object !== context.state.async_consts?.id);
-
-	if (has_await || context.state.async_consts || blockers.length > 0) {
-		const run = (context.state.async_consts ??= {
-			id: context.state.analysis.root.unique('promises'),
-			declaration_count: 0
-		});
-		node.metadata.promises_id = run.id;
-
-		const bindings = context.state.scope.get_bindings(declaration);
-
-		// keep the counter in sync with the number of thunks pushed in ConstTag in transform
-		// TODO 6.0 once non-async and non-runes mode is gone investigate making this more robust
-		// via something like the approach in https://github.com/sveltejs/svelte/pull/18032
-		const length = run.declaration_count + (blockers.length > 0 ? 1 : 0);
-		run.declaration_count += blockers.length > 0 ? 2 : 1;
-		const blocker = b.member(run.id, b.literal(length), true);
-		for (const binding of bindings) {
-			binding.blocker = blocker;
-		}
-	}
+	mark_async_declaration(context, node.metadata, [declaration]);
 }

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

@@ -165,3 +165,3 @@ /** @import { Expression, Identifier } from 'estree' */
 
-			// Find out if this references a {@const ...} declaration of an implicit children snippet
+			// Find out if this references a {@const ...}/{let/const ...} declaration of an implicit children snippet
 			// when it is itself inside a snippet block at the same level. If so, error.
@@ -168,0 +168,0 @@ for (let i = context.path.length - 1; i >= 0; i--) {

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

@@ -7,3 +7,3 @@ /** @import * as ESTree from 'estree' */
 import * as b from '#compiler/builders';
-import { build_getter, is_state_source } from './utils.js';
+import { build_getter, get_transform } from './utils.js';
 import { render_stylesheet } from '../css/index.js';
@@ -26,2 +26,3 @@ import { dev, filename } from '../../../state.js';
 import { ConstTag } from './visitors/ConstTag.js';
+import { DeclarationTag } from './visitors/DeclarationTag.js';
 import { DebugTag } from './visitors/DebugTag.js';
@@ -71,16 +72,3 @@ import { EachBlock } from './visitors/EachBlock.js';
 		if (scope && scope !== state.scope) {
-			const transform = { ...state.transform };
-
-			for (const [name, binding] of scope.declarations) {
-				if (
-					binding.kind === 'normal' ||
-					// Reads of `$state(...)` declarations are not
-					// transformed if they are never reassigned
-					(binding.kind === 'state' && !is_state_source(binding, state.analysis))
-				) {
-					delete transform[name];
-				}
-			}
-
-			next({ ...state, transform, scope });
+			next({ ...state, transform: get_transform(scope, state), scope });
 		} else {
@@ -105,2 +93,3 @@ next();
 	ConstTag,
+	DeclarationTag,
 	DebugTag,
@@ -159,2 +148,3 @@ EachBlock,
 		hoisted: [b.import_all('$', 'svelte/internal/client'), ...analysis.instance_body.hoisted],
+		templates: new Map(),
 		node: /** @type {any} */ (null), // populated by the root node
@@ -161,0 +151,0 @@ legacy_reactive_imports: [],

src/compiler/phase...form/client/transform-template/index.js

@@ -0,1 +1,2 @@
+/** @import { TemplateLiteral } from 'estree' */
 /** @import { Namespace } from '#compiler' */
@@ -34,6 +35,7 @@ /** @import { ComponentClientTransformState } from '../types.js' */
  * @param {ComponentClientTransformState} state
- * @param {Namespace} namespace
+ * @param {string} name
  * @param {number} [flags]
  */
-export function transform_template(state, namespace, flags = 0) {
+export function transform_template(state, name, flags = 0) {
+	const namespace = state.metadata.namespace;
 	const tree = state.options.fragments === 'tree';
@@ -43,2 +45,16 @@
 
+	const key =
+		tree || dev
+			? null
+			: get_template_key(
+					/** @type {TemplateLiteral} */ (expression),
+					state.metadata.namespace,
+					flags
+				);
+
+	if (key !== null) {
+		const existing = state.templates.get(key);
+		if (existing !== undefined) return existing;
+	}
+
 	if (tree) {
@@ -68,3 +84,24 @@ if (namespace === 'svg') flags |= TEMPLATE_USE_SVG;
 
-	return call;
+	const id = state.scope.root.unique(name);
+	state.hoisted.push(b.var(id, call));
+
+	if (key !== null) {
+		state.templates.set(key, id);
+	}
+
+	return id;
 }
+
+/**
+ * Returns a stable key for templates that are safe to deduplicate - plain
+ * `$.from_html`/`from_svg`/`from_mathml` factories with literal arguments - or `null`
+ * for anything else. Dev-mode templates are wrapped in `$.add_locations(...)`, which
+ * embeds per-call-site locations, so they never produce a key and are never shared.
+ * @param {TemplateLiteral} template
+ * @param {Namespace} namespace
+ * @param {number} flags
+ * @returns {string | null}
+ */
+function get_template_key(template, namespace, flags) {
+	return `${namespace} ${flags} ${template.quasis[0].value.raw}`;
+}

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

@@ -182,1 +182,22 @@ /** @import { BlockStatement, Expression, Identifier } from 'estree' */
 }
+
+/**
+ * @param {Scope} scope
+ * @param {ClientTransformState} state
+ */
+export function get_transform(scope, state) {
+	const transform = { ...state.transform };
+
+	for (const [name, binding] of scope.declarations) {
+		if (
+			binding.kind === 'normal' ||
+			// Reads of `$state(...)` declarations are not
+			// transformed if they are never reassigned
+			(binding.kind === 'state' && !is_state_source(binding, state.analysis))
+		) {
+			delete transform[name];
+		}
+	}
+
+	return transform;
+}

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

@@ -10,2 +10,3 @@ /** @import { Expression, Identifier, Pattern, Statement } from 'estree' */
 import { build_expression } from './shared/utils.js';
+import { add_async_declaration } from './DeclarationTag.js';
 
@@ -30,3 +31,3 @@ /**
 
-		add_const_declaration(context.state, declaration.id, expression, node.metadata);
+		add_const_declaration(context, declaration.id, expression, node.metadata);
 	} else {
@@ -68,3 +69,3 @@ const identifiers = extract_identifiers(declaration.id);
 
-		add_const_declaration(context.state, tmp, expression, node.metadata);
+		add_const_declaration(context, tmp, expression, node.metadata);
 
@@ -80,3 +81,3 @@ for (const node of identifiers) {
 /**
- * @param {ComponentContext['state']} state
+ * @param {ComponentContext} context
  * @param {Identifier} id
@@ -86,3 +87,3 @@ * @param {Expression} expression
  */
-function add_const_declaration(state, id, expression, metadata) {
+function add_const_declaration(context, id, expression, metadata) {
 	// we need to eagerly evaluate the expression in order to hit any
@@ -92,24 +93,12 @@ // 'Cannot access x before initialization' errors
 
-	const blockers = [...metadata.expression.dependencies]
-		.map((dep) => dep.blocker)
-		.filter((b) => b !== null && b.object !== state.async_consts?.id);
-
 	if (metadata.promises_id) {
-		const run = (state.async_consts ??= {
-			id: metadata.promises_id,
-			thunks: []
-		});
-
-		state.consts.push(b.let(id));
-
-		if (blockers.length === 1) {
-			run.thunks.push(b.thunk(b.member(/** @type {Expression} */ (blockers[0]), 'promise')));
-		} else if (blockers.length > 0) {
-			run.thunks.push(b.thunk(b.call('$.wait', b.array(blockers))));
-		}
-
-		// keep the number of thunks pushed in sync with ConstTag in analysis phase
-		const assignment = b.assignment('=', id, expression);
-		run.thunks.push(b.thunk(assignment, metadata.expression.has_await));
+		add_async_declaration(
+			context,
+			metadata,
+			[id],
+			[b.stmt(b.assignment('=', id, expression))],
+			'let'
+		);
 	} else {
+		const { state } = context;
 		state.consts.push(b.const(id, expression));
@@ -116,0 +105,0 @@ state.consts.push(...after);

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

@@ -55,3 +55,2 @@ /** @import { Expression, Statement } from 'estree' */
 				/** @type {AST.IfBlock} */ (parent).metadata.flattened?.includes(trimmed[0])));
-	const template_name = context.state.scope.root.unique('root'); // TODO infer name from parent
 
@@ -100,4 +99,3 @@ /** @type {Statement[]} */
 
-		const template = transform_template(state, namespace, flags);
-		state.hoisted.push(b.var(template_name, template));
+		const template_name = transform_template(state, 'root', flags);
 
@@ -152,4 +150,3 @@ state.init.unshift(b.var(id, b.call(template_name)));
 			} else {
-				const template = transform_template(state, namespace, flags);
-				state.hoisted.push(b.var(template_name, template));
+				const template_name = transform_template(state, 'root', flags);
 
@@ -156,0 +153,0 @@ state.init.unshift(b.var(id, b.call(template_name)));

src/compiler/phase...sform/client/visitors/RegularElement.js

@@ -21,3 +21,3 @@ /** @import { ArrayExpression, Expression, ExpressionStatement, Identifier, MemberExpression, ObjectExpression } from 'estree' */
 import { clean_nodes, determine_namespace_for_children } from '../../utils.js';
-import { build_getter } from '../utils.js';
+import { build_getter, get_transform } from '../utils.js';
 import {
@@ -304,2 +304,4 @@ get_attribute_name,
 
+	const scope = /** @type {Scope} */ (context.state.scopes.get(node.fragment));
+
 	/** @type {ComponentClientTransformState} */
@@ -309,3 +311,4 @@ const state = {
 		metadata,
-		scope: /** @type {Scope} */ (context.state.scopes.get(node.fragment)),
+		scope,
+		transform: get_transform(scope, context.state),
 		preserve_whitespace: context.state.preserve_whitespace || name === 'pre' || name === 'textarea'
@@ -324,4 +327,15 @@ };
 
+	const has_declarations = !node.fragment.metadata.transparent;
+
 	/** @type {typeof state} */
-	const child_state = { ...state, init: [], update: [], after_update: [], snippets: [] };
+	const child_state = {
+		...state,
+		init: [],
+		update: [],
+		after_update: [],
+		snippets: [],
+		consts: has_declarations ? [] : state.consts,
+		async_consts: has_declarations ? undefined : state.async_consts,
+		memoizer: has_declarations ? new Memoizer() : state.memoizer
+	};
 
@@ -367,3 +381,2 @@ for (const node of hoisted) {
 		// Create a separate template for the rich content
-		const template_name = context.state.scope.root.unique(`${name}_content`);
 		const fragment_id = b.id(context.state.scope.generate('fragment'));
@@ -392,5 +405,4 @@ const anchor_id = b.id(context.state.scope.generate('anchor'));
 
-		// Transform the template to $.from_html(...) and hoist it
-		const template = transform_template(select_state, metadata.namespace, TEMPLATE_FRAGMENT);
-		context.state.hoisted.push(b.var(template_name, template));
+		// Transform the template to $.from_html(...) and hoist it (deduplicating identical templates)
+		const template_name = transform_template(select_state, `${name}_content`, TEMPLATE_FRAGMENT);
 
@@ -436,3 +448,12 @@ // Build the rich content function body
 
-	if (node.fragment.nodes.some((node) => node.type === 'SnippetBlock')) {
+	if (node.fragment.nodes.some((node) => node.type === 'SnippetBlock') || has_declarations) {
+		if (child_state.async_consts && child_state.async_consts.thunks.length > 0) {
+			child_state.consts.push(
+				b.var(
+					child_state.async_consts.id,
+					b.call('$.run', b.array(child_state.async_consts.thunks))
+				)
+			);
+		}
+
 		// Wrap children in `{...}` to avoid declaration conflicts
@@ -442,2 +463,3 @@ context.state.init.push(
 				...child_state.snippets,
+				...child_state.consts,
 				...child_state.init,
@@ -444,0 +466,0 @@ ...element_state.init,

src/compiler/phase...sform/client/visitors/SvelteBoundary.js

@@ -43,2 +43,3 @@ /** @import { BlockStatement, Statement, Expression, VariableDeclaration } from 'estree' */
 	let has_const = false;
+	let has_declaration = false;
 
@@ -59,2 +60,6 @@ // const tags need to live inside the boundary, but might also be referenced in hoisted snippets.
 		}
+
+		if (child.type === 'DeclarationTag') {
+			has_declaration = true;
+		}
 	}
@@ -73,6 +78,6 @@
 				context.state.options.experimental.async &&
-				has_const &&
+				(has_const || has_declaration) &&
 				!['failed', 'pending'].includes(child.expression.name)
 			) {
-				// we can't hoist snippets as they may reference const tags, so we just keep them in the fragment
+				// we can't hoist snippets as they may reference const/declaration tags, so we just keep them in the fragment
 				nodes.push(child);
@@ -79,0 +84,0 @@ } else {

src/compiler/phase.../client/visitors/VariableDeclaration.js

@@ -52,4 +52,9 @@ /** @import { CallExpression, Expression, Identifier, Literal, VariableDeclaration, VariableDeclarator } from 'estree' */
 				if (declarator.id.type === 'Identifier') {
+					const exclude_id = context.state.scope.root.unique('rest_excludes');
+					context.state.hoisted.push(
+						b.var(exclude_id, b.new('Set', b.array(seen.map((name) => b.literal(name)))))
+					);
+
 					/** @type {Expression[]} */
-					const args = [b.id('$$props'), b.array(seen.map((name) => b.literal(name)))];
+					const args = [b.id('$$props'), exclude_id];
 
@@ -99,4 +104,9 @@ if (dev) {
 							// RestElement
+							const exclude_id = context.state.scope.root.unique('rest_excludes');
+							context.state.hoisted.push(
+								b.var(exclude_id, b.new('Set', b.array(seen.map((name) => b.literal(name)))))
+							);
+
 							/** @type {Expression[]} */
-							const args = [b.id('$$props'), b.array(seen.map((name) => b.literal(name)))];
+							const args = [b.id('$$props'), exclude_id];
 
@@ -103,0 +113,0 @@ if (dev) {

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

@@ -18,2 +18,3 @@ /** @import * as ESTree from 'estree' */
 import { ConstTag } from './visitors/ConstTag.js';
+import { DeclarationTag } from './visitors/DeclarationTag.js';
 import { DebugTag } from './visitors/DebugTag.js';
@@ -68,2 +69,3 @@ import { EachBlock } from './visitors/EachBlock.js';
 	ConstTag,
+	DeclarationTag,
 	DebugTag,
@@ -70,0 +72,0 @@ EachBlock,

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

@@ -1,2 +0,2 @@
-/** @import { Expression, Pattern, Statement } from 'estree' */
+/** @import { Expression, Pattern } from 'estree' */
 /** @import { AST } from '#compiler' */
@@ -6,2 +6,3 @@ /** @import { ComponentContext } from '../types.js' */
 import { extract_identifiers } from '../../../../utils/ast.js';
+import { add_async_declaration } from './DeclarationTag.js';
 
@@ -16,27 +17,11 @@ /**
 	const init = /** @type {Expression} */ (context.visit(declaration.init));
-	const blockers = [...node.metadata.expression.dependencies]
-		.map((dep) => dep.blocker)
-		.filter((b) => b !== null && b.object !== context.state.async_consts?.id);
 
 	if (node.metadata.promises_id) {
-		const run = (context.state.async_consts ??= {
-			id: node.metadata.promises_id,
-			thunks: []
-		});
-
-		const identifiers = extract_identifiers(declaration.id);
-
-		for (const identifier of identifiers) {
-			context.state.init.push(b.let(identifier.name));
-		}
-
-		if (blockers.length === 1) {
-			run.thunks.push(b.thunk(/** @type {Expression} */ (blockers[0])));
-		} else if (blockers.length > 0) {
-			run.thunks.push(b.thunk(b.call('Promise.all', b.array(blockers))));
-		}
-
-		// keep the number of thunks pushed in sync with ConstTag in analysis phase
-		const assignment = b.assignment('=', id, init);
-		run.thunks.push(b.thunk(assignment, node.metadata.expression.has_await));
+		add_async_declaration(
+			context,
+			node.metadata,
+			extract_identifiers(id),
+			[b.stmt(b.assignment('=', id, init))],
+			'let'
+		);
 	} else {
@@ -43,0 +28,0 @@ context.state.init.push(b.const(id, init));

src/compiler/phase...sform/server/visitors/RegularElement.js

@@ -20,2 +20,3 @@ /** @import { Expression } from 'estree' */
 	const namespace = determine_namespace_for_children(node, context.state.namespace);
+	const has_child_declarations = !node.fragment.metadata.transparent;
 
@@ -26,8 +27,13 @@ /** @type {ComponentServerTransformState} */
 		namespace,
+		scope: /** @type {Scope} */ (context.state.scopes.get(node.fragment)),
 		preserve_whitespace:
 			context.state.preserve_whitespace || node.name === 'pre' || node.name === 'textarea',
 		init: [],
-		template: []
+		template: [],
+		async_consts: undefined
 	};
 
+	/** @type {ComponentServerTransformState} */
+	const attribute_state = { ...state, scope: context.state.scope };
+
 	const node_is_void = is_void(name);
@@ -55,3 +61,7 @@
 		state.template.push(b.literal(`<${name}`));
-		body = build_element_attributes(node, { ...context, state }, optimiser.transform);
+		body = build_element_attributes(
+			node,
+			{ ...context, state: attribute_state },
+			optimiser.transform
+		);
 		state.template.push(b.literal(node_is_void ? '/>' : '>')); // add `/>` for XHTML compliance
@@ -78,6 +88,3 @@ }
 		namespace,
-		{
-			...state,
-			scope: /** @type {Scope} */ (state.scopes.get(node.fragment))
-		},
+		state,
 		state.preserve_whitespace,
@@ -212,4 +219,14 @@ state.options.preserveComments
 
-	if (optimiser.is_async()) {
+	if (has_child_declarations && state.async_consts && state.async_consts.thunks.length > 0) {
+		state.init.push(
+			b.var(state.async_consts.id, b.call('$$renderer.run', b.array(state.async_consts.thunks)))
+		);
+	}
+
+	if (has_child_declarations) {
 		context.state.template.push(
+			...optimiser.render([b.block([...state.init, ...build_template(state.template)])])
+		);
+	} else if (optimiser.is_async()) {
+		context.state.template.push(
 			...optimiser.render([...state.init, ...build_template(state.template)])
@@ -216,0 +233,0 @@ );

src/compiler/phases/3-transform/utils.js

@@ -155,2 +155,3 @@ /** @import { TransformState } from './types.js' */
 			node.type === 'ConstTag' ||
+			node.type === 'DeclarationTag' ||
 			node.type === 'DebugTag' ||
@@ -157,0 +158,0 @@ node.type === 'SvelteBody' ||

src/compiler/phases/nodes.js

@@ -220,2 +220,3 @@ /** @import { Expression, PrivateIdentifier, SourceLocation } from 'estree' */
 			case 'ConstTag':
+			case 'DeclarationTag':
 			case 'Comment':
@@ -222,0 +223,0 @@ case 'ExpressionTag':

src/compiler/print/index.js

@@ -606,2 +606,44 @@ /** @import { AST } from '#compiler'; */
 
+	DeclarationTag(node, context) {
+		context.write('{');
+
+		// This is duplicated from esrap's handling of VariableDeclaration,
+		// which we need to do in order to omit the trailing semicolon that esrap would add.
+		const open = context.new();
+		const join = context.new();
+		const child_context = context.new();
+
+		context.append(child_context);
+
+		child_context.write(`${node.declaration.kind} `);
+		child_context.append(open);
+
+		const declarations = node.declaration.declarations;
+		let first = true;
+
+		for (const d of declarations) {
+			if (!first) child_context.append(join);
+			first = false;
+
+			child_context.visit(d);
+		}
+
+		const length = child_context.measure() + 2 * (declarations.length - 1);
+
+		const multiline = child_context.multiline || (declarations.length > 1 && length > 50);
+
+		if (multiline) {
+			context.multiline = true;
+
+			if (declarations.length > 1) open.indent();
+			join.write(',');
+			join.newline();
+			if (declarations.length > 1) context.dedent();
+		} else {
+			join.write(', ');
+		}
+
+		context.write('}');
+	},
+
 	DebugTag(node, context) {
@@ -608,0 +650,0 @@ context.write('{@debug ');

src/compiler/utils/builders.js

@@ -689,3 +689,4 @@ /** @import * as ESTree from 'estree' */
 	null_instance as null,
-	debugger_builder as debugger
+	debugger_builder as debugger,
+	new_builder as new
 };
@@ -692,0 +693,0 @@

src/internal/client/dom/blocks/boundary.js

@@ -399,3 +399,3 @@ /** @import { Effect, Source, TemplateNode, } from '#client' */
 
-			current_batch.on_fork_commit(() => {
+			current_batch.oncommit(() => {
 				this.#handle_error(error);
@@ -402,0 +402,0 @@ });

src/internal/client/dom/operations.js

@@ -236,2 +236,8 @@ /** @import { Effect, TemplateNode } from '#client' */
 /**
+ * Branching here is intentional and load-bearing for perf. `createElement(tag)`
+ * hits a fast path in Blink that `createElementNS(NAMESPACE_HTML, tag)` doesn't,
+ * and passing an explicit `undefined` as the trailing options arg measurably
+ * slows both APIs. Funnelling every case through a single `createElementNS(ns,
+ * tag, options)` call would be smaller but slower on the HTML path.
+ *
  * @template {keyof HTMLElementTagNameMap | string} T
@@ -244,5 +250,9 @@ * @param {T} tag
 export function create_element(tag, namespace, is) {
-	let options = is ? { is } : undefined;
+	if (namespace == null || namespace === NAMESPACE_HTML) {
+		return /** @type {T extends keyof HTMLElementTagNameMap ? HTMLElementTagNameMap[T] : Element} */ (
+			is ? document.createElement(tag, { is }) : document.createElement(tag)
+		);
+	}
 	return /** @type {T extends keyof HTMLElementTagNameMap ? HTMLElementTagNameMap[T] : Element} */ (
-		document.createElementNS(namespace ?? NAMESPACE_HTML, tag, options)
+		is ? document.createElementNS(namespace, tag, { is }) : document.createElementNS(namespace, tag)
 	);
@@ -249,0 +259,0 @@ }

src/internal/client/reactivity/batch.js

@@ -144,8 +144,2 @@ /** @import { Fork } from 'svelte' */
 	/**
-	 * Callbacks that should run only when a fork is committed.
-	 * @type {Set<(batch: Batch) => void>}
-	 */
-	#fork_commit_callbacks = new Set();
-
-	/**
 	 * The number of async effects that are currently in flight
@@ -638,3 +632,2 @@ */
 		this.#discard_callbacks.clear();
-		this.#fork_commit_callbacks.clear();
 
@@ -845,12 +838,2 @@ this.#unlink();
 
-	/** @param {(batch: Batch) => void} fn */
-	on_fork_commit(fn) {
-		this.#fork_commit_callbacks.add(fn);
-	}
-
-	run_fork_commit_callbacks() {
-		for (const fn of this.#fork_commit_callbacks) fn(this);
-		this.#fork_commit_callbacks.clear();
-	}
-
 	settled() {
@@ -1416,6 +1399,2 @@ return (this.#deferred ??= deferred()).promise;
 
-			batch.activate();
-			batch.run_fork_commit_callbacks();
-			batch.deactivate();
-
 			// trigger any `$state.eager(...)` expressions with the new state.
@@ -1422,0 +1401,0 @@ // eager effects don't get scheduled like other effects, so we

src/internal/client/reactivity/props.js

@@ -52,7 +52,7 @@ /** @import { Derived, Effect, Source } from './types.js' */
  * Is passed the full `$$props` object and excludes the named props.
- * @type {ProxyHandler<{ props: Record<string | symbol, unknown>, exclude: Array<string | symbol>, name?: string }>}}
+ * @type {ProxyHandler<{ props: Record<string | symbol, unknown>, exclude: Set<string | symbol>, name?: string }>}}
  */
 const rest_props_handler = {
 	get(target, key) {
-		if (target.exclude.includes(key)) return;
+		if (target.exclude.has(key)) return;
 		return target.props[key];
@@ -69,3 +69,3 @@ },
 	getOwnPropertyDescriptor(target, key) {
-		if (target.exclude.includes(key)) return;
+		if (target.exclude.has(key)) return;
 		if (key in target.props) {
@@ -80,7 +80,7 @@ return {
 	has(target, key) {
-		if (target.exclude.includes(key)) return false;
+		if (target.exclude.has(key)) return false;
 		return key in target.props;
 	},
 	ownKeys(target) {
-		return Reflect.ownKeys(target.props).filter((key) => !target.exclude.includes(key));
+		return Reflect.ownKeys(target.props).filter((key) => !target.exclude.has(key));
 	}
@@ -91,3 +91,3 @@ };
  * @param {Record<string, unknown>} props
- * @param {string[]} exclude
+ * @param {Set<string>} exclude
  * @param {string} [name]
@@ -94,0 +94,0 @@ * @returns {Record<string, unknown>}

src/internal/client/reactivity/sources.js

@@ -35,3 +35,2 @@ /** @import { Derived, Effect, Source, Value } from '#client' */
 import { legacy_mode_flag, tracing_mode_flag } from '../../flags/index.js';
-import { includes } from '../../shared/utils.js';
 import { tag_proxy } from '../dev/tracing.js';
@@ -162,3 +161,3 @@ import { get_error } from '../../shared/dev.js';
 		(active_reaction.f & (DERIVED | BLOCK_EFFECT | ASYNC | EAGER_EFFECT)) !== 0 &&
-		(current_sources === null || !includes.call(current_sources, source))
+		(current_sources === null || !current_sources.has(source))
 	) {
@@ -165,0 +164,0 @@ e.state_unsafe_mutation();

src/internal/client/runtime.js

@@ -93,3 +93,3 @@ /** @import { Derived, Effect, Reaction, Source, Value } from '#client' */
  * them within that reaction should not cause a re-run
- * @type {null | Source[]}
+ * @type {null | Set<Source>}
  */
@@ -101,7 +101,3 @@ export let current_sources = null;
 	if (active_reaction !== null && (!async_mode_flag || (active_reaction.f & DERIVED) !== 0)) {
-		if (current_sources === null) {
-			current_sources = [value];
-		} else {
-			current_sources.push(value);
-		}
+		(current_sources ??= new Set()).add(value);
 	}
@@ -207,3 +203,3 @@ }
 
-	if (!async_mode_flag && current_sources !== null && includes.call(current_sources, signal)) {
+	if (!async_mode_flag && current_sources !== null && current_sources.has(signal)) {
 		return;
@@ -546,3 +542,3 @@ }
 
-		if (!destroyed && (current_sources === null || !includes.call(current_sources, signal))) {
+		if (!destroyed && (current_sources === null || !current_sources.has(signal))) {
 			var deps = active_reaction.deps;
@@ -549,0 +545,0 @@

src/utils.js

@@ -437,3 +437,3 @@ const regex_return_characters = /\r/g;
 
-const RUNES = /** @type {const} */ ([
+export const RUNES = /** @type {const} */ ([
 	...STATE_CREATION_RUNES,
@@ -440,0 +440,0 @@ '$state.eager',

src/version.js

@@ -7,3 +7,3 @@ // generated during release, do not modify
  */
-export const VERSION = '5.55.10';
+export const VERSION = '5.56.0';
 export const PUBLIC_VERSION = '5';

types/index.d.ts.map

@@ -276,4 +276,4 @@ {
 	],
-	"mappings": 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 	"ignoreList": []
 }

New alerts

URL strings

Supply chain risk

Package contains fragments of external URLs or IP addresses, which the package may be accessing at runtime.

Found 1 instance in 1 package

Fixed alerts

URL strings

Supply chain risk

Package contains fragments of external URLs or IP addresses, which the package may be accessing at runtime.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

2863014

0.68%

Number of package files

389

0.78%

Lines of code

63952

0.69%

Worsened metrics

Dev dependency count

17

13.33%

No dependency changes