fix: vite

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

@@ -0,0 +1,214 @@
+/** @import { Comment, Program } from 'estree' */
+/** @import { Node } from 'acorn' */
+import * as acorn from 'acorn';
+import { walk } from 'zimmerframe';
+import { tsPlugin } from 'acorn-typescript';
+import { locator } from '../../state.js';
+
+const ParserWithTS = acorn.Parser.extend(tsPlugin({ allowSatisfies: true }));
+
+/**
+ * @param {string} source
+ * @param {boolean} typescript
+ * @param {boolean} [is_script]
+ */
+export function parse(source, typescript, is_script) {
+	const parser = typescript ? ParserWithTS : acorn.Parser;
+	const { onComment, add_comments } = get_comment_handlers(source);
+	// @ts-ignore
+	const parse_statement = parser.prototype.parseStatement;
+
+	// If we're dealing with a <script> then it might contain an export
+	// for something that doesn't exist directly inside but is inside the
+	// component instead, so we need to ensure that Acorn doesn't throw
+	// an error in these cases
+	if (is_script) {
+		// @ts-ignore
+		parser.prototype.parseStatement = function (...args) {
+			const v = parse_statement.call(this, ...args);
+			// @ts-ignore
+			this.undefinedExports = {};
+			return v;
+		};
+	}
+
+	let ast;
+
+	try {
+		ast = parser.parse(source, {
+			onComment,
+			sourceType: 'module',
+			ecmaVersion: 13,
+			locations: true
+		});
+	} finally {
+		if (is_script) {
+			// @ts-ignore
+			parser.prototype.parseStatement = parse_statement;
+		}
+	}
+
+	if (typescript) amend(source, ast);
+	add_comments(ast);
+
+	return /** @type {Program} */ (ast);
+}
+
+/**
+ * @param {string} source
+ * @param {boolean} typescript
+ * @param {number} index
+ * @returns {acorn.Expression & { leadingComments?: CommentWithLocation[]; trailingComments?: CommentWithLocation[]; }}
+ */
+export function parse_expression_at(source, typescript, index) {
+	const parser = typescript ? ParserWithTS : acorn.Parser;
+	const { onComment, add_comments } = get_comment_handlers(source);
+
+	const ast = parser.parseExpressionAt(source, index, {
+		onComment,
+		sourceType: 'module',
+		ecmaVersion: 13,
+		locations: true
+	});
+
+	if (typescript) amend(source, ast);
+	add_comments(ast);
+
+	return ast;
+}
+
+/**
+ * Acorn doesn't add comments to the AST by itself. This factory returns the capabilities
+ * to add them after the fact. They are needed in order to support `svelte-ignore` comments
+ * in JS code and so that `prettier-plugin-svelte` doesn't remove all comments when formatting.
+ * @param {string} source
+ */
+function get_comment_handlers(source) {
+	/**
+	 * @typedef {Comment & {
+	 *   start: number;
+	 *   end: number;
+	 * }} CommentWithLocation
+	 */
+
+	/** @type {CommentWithLocation[]} */
+	const comments = [];
+
+	return {
+		/**
+		 * @param {boolean} block
+		 * @param {string} value
+		 * @param {number} start
+		 * @param {number} end
+		 */
+		onComment: (block, value, start, end) => {
+			if (block && /\n/.test(value)) {
+				let a = start;
+				while (a > 0 && source[a - 1] !== '\n') a -= 1;
+
+				let b = a;
+				while (/[ \t]/.test(source[b])) b += 1;
+
+				const indentation = source.slice(a, b);
+				value = value.replace(new RegExp(`^${indentation}`, 'gm'), '');
+			}
+
+			comments.push({ type: block ? 'Block' : 'Line', value, start, end });
+		},
+
+		/** @param {acorn.Node & { leadingComments?: CommentWithLocation[]; trailingComments?: CommentWithLocation[]; }} ast */
+		add_comments(ast) {
+			if (comments.length === 0) return;
+
+			walk(ast, null, {
+				_(node, { next, path }) {
+					let comment;
+
+					while (comments[0] && comments[0].start < node.start) {
+						comment = /** @type {CommentWithLocation} */ (comments.shift());
+						(node.leadingComments ||= []).push(comment);
+					}
+
+					next();
+
+					if (comments[0]) {
+						const parent = /** @type {any} */ (path.at(-1));
+
+						if (parent === undefined || node.end !== parent.end) {
+							const slice = source.slice(node.end, comments[0].start);
+							const is_last_in_body =
+								((parent?.type === 'BlockStatement' || parent?.type === 'Program') &&
+									parent.body.indexOf(node) === parent.body.length - 1) ||
+								(parent?.type === 'ArrayExpression' &&
+									parent.elements.indexOf(node) === parent.elements.length - 1) ||
+								(parent?.type === 'ObjectExpression' &&
+									parent.properties.indexOf(node) === parent.properties.length - 1);
+
+							if (is_last_in_body) {
+								// Special case: There can be multiple trailing comments after the last node in a block,
+								// and they can be separated by newlines
+								let end = node.end;
+
+								while (comments.length) {
+									const comment = comments[0];
+									if (parent && comment.start >= parent.end) break;
+
+									(node.trailingComments ||= []).push(comment);
+									comments.shift();
+									end = comment.end;
+								}
+							} else if (node.end <= comments[0].start && /^[,) \t]*$/.test(slice)) {
+								node.trailingComments = [/** @type {CommentWithLocation} */ (comments.shift())];
+							}
+						}
+					}
+				}
+			});
+
+			// Special case: Trailing comments after the root node (which can only happen for expression tags or for Program nodes).
+			// Adding them ensures that we can later detect the end of the expression tag correctly.
+			if (comments.length > 0 && (comments[0].start >= ast.end || ast.type === 'Program')) {
+				(ast.trailingComments ||= []).push(...comments.splice(0));
+			}
+		}
+	};
+}
+
+/**
+ * Tidy up some stuff left behind by acorn-typescript
+ * @param {string} source
+ * @param {Node} node
+ */
+function amend(source, node) {
+	return walk(node, null, {
+		_(node, context) {
+			// @ts-expect-error
+			delete node.loc.start.index;
+			// @ts-expect-error
+			delete node.loc.end.index;
+
+			if (typeof node.loc?.end === 'number') {
+				const loc = locator(node.loc.end);
+				if (loc) {
+					node.loc.end = {
+						line: loc.line,
+						column: loc.column
+					};
+				}
+			}
+
+			if (
+				/** @type {any} */ (node).typeAnnotation &&
+				(node.end === undefined || node.end < node.start)
+			) {
+				// i think there might be a bug in acorn-typescript that prevents
+				// `end` from being assigned when there's a type annotation
+				let end = /** @type {any} */ (node).typeAnnotation.start;
+				while (/\s/.test(source[end - 1])) end -= 1;
+				node.end = end;
+			}
+
+			context.next();
+		}
+	});
+}

node_modules/svelte/src/compiler/phases/1-parse/ambient.d.ts

@@ -0,0 +1,3 @@
+// Silence the acorn typescript errors through this ambient type definition + tsconfig.json path alias
+// That way we can omit `"skipLibCheck": true` and catch other errors in our d.ts files
+declare module 'acorn-typescript';

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

@@ -0,0 +1,312 @@
+/** @import { AST } from '#compiler' */
+// @ts-expect-error acorn type definitions are borked in the release we use
+import { isIdentifierStart, isIdentifierChar } from 'acorn';
+import fragment from './state/fragment.js';
+import { regex_whitespace } from '../patterns.js';
+import * as e from '../../errors.js';
+import { create_fragment } from './utils/create.js';
+import read_options from './read/options.js';
+import { is_reserved } from '../../../utils.js';
+import { disallow_children } from '../2-analyze/visitors/shared/special-element.js';
+
+const regex_position_indicator = / \(\d+:\d+\)$/;
+
+const regex_lang_attribute =
+	/<!--[^]*?-->|<script\s+(?:[^>]*|(?:[^=>'"/]+=(?:"[^"]*"|'[^']*'|[^>\s]+)\s+)*)lang=(["'])?([^"' >]+)\1[^>]*>/g;
+
+export class Parser {
+	/**
+	 * @readonly
+	 * @type {string}
+	 */
+	template;
+
+	/**
+	 * @readonly
+	 * @type {string}
+	 */
+	template_untrimmed;
+
+	/**
+	 * Whether or not we're in loose parsing mode, in which
+	 * case we try to continue parsing as much as possible
+	 * @type {boolean}
+	 */
+	loose;
+
+	/** */
+	index = 0;
+
+	/** Whether we're parsing in TypeScript mode */
+	ts = false;
+
+	/** @type {AST.TemplateNode[]} */
+	stack = [];
+
+	/** @type {AST.Fragment[]} */
+	fragments = [];
+
+	/** @type {AST.Root} */
+	root;
+
+	/** @type {Record<string, boolean>} */
+	meta_tags = {};
+
+	/** @type {LastAutoClosedTag | undefined} */
+	last_auto_closed_tag;
+
+	/**
+	 * @param {string} template
+	 * @param {boolean} loose
+	 */
+	constructor(template, loose) {
+		if (typeof template !== 'string') {
+			throw new TypeError('Template must be a string');
+		}
+
+		this.loose = loose;
+		this.template_untrimmed = template;
+		this.template = template.trimEnd();
+
+		let match_lang;
+
+		do match_lang = regex_lang_attribute.exec(template);
+		while (match_lang && match_lang[0][1] !== 's'); // ensure it starts with '<s' to match script tags
+
+		regex_lang_attribute.lastIndex = 0; // reset matched index to pass tests - otherwise declare the regex inside the constructor
+
+		this.ts = match_lang?.[2] === 'ts';
+
+		this.root = {
+			css: null,
+			js: [],
+			// @ts-ignore
+			start: null,
+			// @ts-ignore
+			end: null,
+			type: 'Root',
+			fragment: create_fragment(),
+			options: null,
+			metadata: {
+				ts: this.ts
+			}
+		};
+
+		this.stack.push(this.root);
+		this.fragments.push(this.root.fragment);
+
+		/** @type {ParserState} */
+		let state = fragment;
+
+		while (this.index < this.template.length) {
+			state = state(this) || fragment;
+		}
+
+		if (this.stack.length > 1) {
+			const current = this.current();
+
+			if (this.loose) {
+				current.end = this.template.length;
+			} else if (current.type === 'RegularElement') {
+				current.end = current.start + 1;
+				e.element_unclosed(current, current.name);
+			} else {
+				current.end = current.start + 1;
+				e.block_unclosed(current);
+			}
+		}
+
+		if (state !== fragment) {
+			e.unexpected_eof(this.index);
+		}
+
+		if (this.root.fragment.nodes.length) {
+			let start = /** @type {number} */ (this.root.fragment.nodes[0].start);
+			while (regex_whitespace.test(template[start])) start += 1;
+
+			let end = /** @type {number} */ (
+				this.root.fragment.nodes[this.root.fragment.nodes.length - 1].end
+			);
+			while (regex_whitespace.test(template[end - 1])) end -= 1;
+
+			this.root.start = start;
+			this.root.end = end;
+		} else {
+			// @ts-ignore
+			this.root.start = this.root.end = null;
+		}
+
+		const options_index = this.root.fragment.nodes.findIndex(
+			/** @param {any} thing */
+			(thing) => thing.type === 'SvelteOptions'
+		);
+		if (options_index !== -1) {
+			const options = /** @type {AST.SvelteOptionsRaw} */ (this.root.fragment.nodes[options_index]);
+			this.root.fragment.nodes.splice(options_index, 1);
+			this.root.options = read_options(options);
+
+			disallow_children(options);
+
+			// We need this for the old AST format
+			Object.defineProperty(this.root.options, '__raw__', {
+				value: options,
+				enumerable: false
+			});
+		}
+	}
+
+	current() {
+		return this.stack[this.stack.length - 1];
+	}
+
+	/**
+	 * @param {any} err
+	 * @returns {never}
+	 */
+	acorn_error(err) {
+		e.js_parse_error(err.pos, err.message.replace(regex_position_indicator, ''));
+	}
+
+	/**
+	 * @param {string} str
+	 * @param {boolean} required
+	 * @param {boolean} required_in_loose
+	 */
+	eat(str, required = false, required_in_loose = true) {
+		if (this.match(str)) {
+			this.index += str.length;
+			return true;
+		}
+
+		if (required && (!this.loose || required_in_loose)) {
+			e.expected_token(this.index, str);
+		}
+
+		return false;
+	}
+
+	/** @param {string} str */
+	match(str) {
+		const length = str.length;
+		if (length === 1) {
+			// more performant than slicing
+			return this.template[this.index] === str;
+		}
+
+		return this.template.slice(this.index, this.index + length) === str;
+	}
+
+	/**
+	 * Match a regex at the current index
+	 * @param {RegExp} pattern  Should have a ^ anchor at the start so the regex doesn't search past the beginning, resulting in worse performance
+	 */
+	match_regex(pattern) {
+		const match = pattern.exec(this.template.slice(this.index));
+		if (!match || match.index !== 0) return null;
+
+		return match[0];
+	}
+
+	allow_whitespace() {
+		while (this.index < this.template.length && regex_whitespace.test(this.template[this.index])) {
+			this.index++;
+		}
+	}
+
+	/**
+	 * Search for a regex starting at the current index and return the result if it matches
+	 * @param {RegExp} pattern  Should have a ^ anchor at the start so the regex doesn't search past the beginning, resulting in worse performance
+	 */
+	read(pattern) {
+		const result = this.match_regex(pattern);
+		if (result) this.index += result.length;
+		return result;
+	}
+
+	/** @param {any} allow_reserved */
+	read_identifier(allow_reserved = false) {
+		const start = this.index;
+
+		let i = this.index;
+
+		const code = /** @type {number} */ (this.template.codePointAt(i));
+		if (!isIdentifierStart(code, true)) return null;
+
+		i += code <= 0xffff ? 1 : 2;
+
+		while (i < this.template.length) {
+			const code = /** @type {number} */ (this.template.codePointAt(i));
+
+			if (!isIdentifierChar(code, true)) break;
+			i += code <= 0xffff ? 1 : 2;
+		}
+
+		const identifier = this.template.slice(this.index, (this.index = i));
+
+		if (!allow_reserved && is_reserved(identifier)) {
+			e.unexpected_reserved_word(start, identifier);
+		}
+
+		return identifier;
+	}
+
+	/** @param {RegExp} pattern */
+	read_until(pattern) {
+		if (this.index >= this.template.length) {
+			if (this.loose) return '';
+			e.unexpected_eof(this.template.length);
+		}
+
+		const start = this.index;
+		const match = pattern.exec(this.template.slice(start));
+
+		if (match) {
+			this.index = start + match.index;
+			return this.template.slice(start, this.index);
+		}
+
+		this.index = this.template.length;
+		return this.template.slice(start);
+	}
+
+	require_whitespace() {
+		if (!regex_whitespace.test(this.template[this.index])) {
+			e.expected_whitespace(this.index);
+		}
+
+		this.allow_whitespace();
+	}
+
+	pop() {
+		this.fragments.pop();
+		return this.stack.pop();
+	}
+
+	/**
+	 * @template {AST.Fragment['nodes'][number]} T
+	 * @param {T} node
+	 * @returns {T}
+	 */
+	append(node) {
+		this.fragments.at(-1)?.nodes.push(node);
+		return node;
+	}
+}
+
+/**
+ * @param {string} template
+ * @param {boolean} [loose]
+ * @returns {AST.Root}
+ */
+export function parse(template, loose = false) {
+	const parser = new Parser(template, loose);
+	return parser.root;
+}
+
+/** @typedef {(parser: Parser) => ParserState | void} ParserState */
+
+/** @typedef {Object} LastAutoClosedTag
+ * @property {string} tag
+ * @property {string} reason
+ * @property {number} depth
+ */

node_modules/svelte/src/compiler/phases/1-parse/read/context.js

@@ -0,0 +1,187 @@
+/** @import { Location } from 'locate-character' */
+/** @import { Pattern } from 'estree' */
+/** @import { Parser } from '../index.js' */
+import { is_bracket_open, is_bracket_close, get_bracket_close } from '../utils/bracket.js';
+import { parse_expression_at } from '../acorn.js';
+import { regex_not_newline_characters } from '../../patterns.js';
+import * as e from '../../../errors.js';
+import { locator } from '../../../state.js';
+
+/**
+ * @param {Parser} parser
+ * @returns {Pattern}
+ */
+export default function read_pattern(parser) {
+	const start = parser.index;
+	let i = parser.index;
+
+	const name = parser.read_identifier();
+
+	if (name !== null) {
+		const annotation = read_type_annotation(parser);
+
+		return {
+			type: 'Identifier',
+			name,
+			start,
+			loc: {
+				start: /** @type {Location} */ (locator(start)),
+				end: /** @type {Location} */ (locator(parser.index))
+			},
+			end: parser.index,
+			typeAnnotation: annotation
+		};
+	}
+
+	if (!is_bracket_open(parser.template[i])) {
+		e.expected_pattern(i);
+	}
+
+	i = match_bracket(parser, start);
+	parser.index = i;
+
+	const pattern_string = parser.template.slice(start, i);
+
+	try {
+		// the length of the `space_with_newline` has to be start - 1
+		// because we added a `(` in front of the pattern_string,
+		// which shifted the entire string to right by 1
+		// so we offset it by removing 1 character in the `space_with_newline`
+		// to achieve that, we remove the 1st space encountered,
+		// so it will not affect the `column` of the node
+		let space_with_newline = parser.template
+			.slice(0, start)
+			.replace(regex_not_newline_characters, ' ');
+		const first_space = space_with_newline.indexOf(' ');
+		space_with_newline =
+			space_with_newline.slice(0, first_space) + space_with_newline.slice(first_space + 1);
+
+		const expression = /** @type {any} */ (
+			parse_expression_at(`${space_with_newline}(${pattern_string} = 1)`, parser.ts, start - 1)
+		).left;
+
+		expression.typeAnnotation = read_type_annotation(parser);
+		if (expression.typeAnnotation) {
+			expression.end = expression.typeAnnotation.end;
+		}
+
+		return expression;
+	} catch (error) {
+		parser.acorn_error(error);
+	}
+}
+
+/**
+ * @param {Parser} parser
+ * @param {number} start
+ */
+function match_bracket(parser, start) {
+	const bracket_stack = [];
+
+	let i = start;
+
+	while (i < parser.template.length) {
+		let char = parser.template[i++];
+
+		if (char === "'" || char === '"' || char === '`') {
+			i = match_quote(parser, i, char);
+			continue;
+		}
+
+		if (is_bracket_open(char)) {
+			bracket_stack.push(char);
+		} else if (is_bracket_close(char)) {
+			const popped = /** @type {string} */ (bracket_stack.pop());
+			const expected = /** @type {string} */ (get_bracket_close(popped));
+
+			if (char !== expected) {
+				e.expected_token(i - 1, expected);
+			}
+
+			if (bracket_stack.length === 0) {
+				return i;
+			}
+		}
+	}
+
+	e.unexpected_eof(parser.template.length);
+}
+
+/**
+ * @param {Parser} parser
+ * @param {number} start
+ * @param {string} quote
+ */
+function match_quote(parser, start, quote) {
+	let is_escaped = false;
+	let i = start;
+
+	while (i < parser.template.length) {
+		const char = parser.template[i++];
+
+		if (is_escaped) {
+			is_escaped = false;
+			continue;
+		}
+
+		if (char === quote) {
+			return i;
+		}
+
+		if (char === '\\') {
+			is_escaped = true;
+		}
+
+		if (quote === '`' && char === '$' && parser.template[i] === '{') {
+			i = match_bracket(parser, i);
+		}
+	}
+
+	e.unterminated_string_constant(start);
+}
+
+/**
+ * @param {Parser} parser
+ * @returns {any}
+ */
+function read_type_annotation(parser) {
+	const start = parser.index;
+	parser.allow_whitespace();
+
+	if (!parser.eat(':')) {
+		parser.index = start;
+		return undefined;
+	}
+
+	// we need to trick Acorn into parsing the type annotation
+	const insert = '_ as ';
+	let a = parser.index - insert.length;
+	const template =
+		parser.template.slice(0, a).replace(/[^\n]/g, ' ') +
+		insert +
+		// If this is a type annotation for a function parameter, Acorn-TS will treat subsequent
+		// parameters as part of a sequence expression instead, and will then error on optional
+		// parameters (`?:`). Therefore replace that sequence with something that will not error.
+		parser.template.slice(parser.index).replace(/\?\s*:/g, ':');
+	let expression = parse_expression_at(template, parser.ts, a);
+
+	// `foo: bar = baz` gets mangled — fix it
+	if (expression.type === 'AssignmentExpression') {
+		let b = expression.right.start;
+		while (template[b] !== '=') b -= 1;
+		expression = parse_expression_at(template.slice(0, b), parser.ts, a);
+	}
+
+	// `array as item: string, index` becomes `string, index`, which is mistaken as a sequence expression - fix that
+	if (expression.type === 'SequenceExpression') {
+		expression = expression.expressions[0];
+	}
+
+	parser.index = /** @type {number} */ (expression.end);
+	return {
+		type: 'TSTypeAnnotation',
+		start,
+		end: parser.index,
+		typeAnnotation: /** @type {any} */ (expression).typeAnnotation
+	};
+}

node_modules/svelte/src/compiler/phases/1-parse/read/expression.js

@@ -0,0 +1,81 @@
+/** @import { Expression } from 'estree' */
+/** @import { Parser } from '../index.js' */
+import { parse_expression_at } from '../acorn.js';
+import { regex_whitespace } from '../../patterns.js';
+import * as e from '../../../errors.js';
+import { find_matching_bracket } from '../utils/bracket.js';
+
+/**
+ * @param {Parser} parser
+ * @param {string} [opening_token]
+ * @returns {Expression | undefined}
+ */
+export function get_loose_identifier(parser, opening_token) {
+	// Find the next } and treat it as the end of the expression
+	const end = find_matching_bracket(parser.template, parser.index, opening_token ?? '{');
+	if (end) {
+		const start = parser.index;
+		parser.index = end;
+		// We don't know what the expression is and signal this by returning an empty identifier
+		return {
+			type: 'Identifier',
+			start,
+			end,
+			name: ''
+		};
+	}
+}
+
+/**
+ * @param {Parser} parser
+ * @param {string} [opening_token]
+ * @param {boolean} [disallow_loose]
+ * @returns {Expression}
+ */
+export default function read_expression(parser, opening_token, disallow_loose) {
+	try {
+		const node = parse_expression_at(parser.template, parser.ts, parser.index);
+
+		let num_parens = 0;
+
+		if (node.leadingComments !== undefined && node.leadingComments.length > 0) {
+			parser.index = node.leadingComments.at(-1).end;
+		}
+
+		for (let i = parser.index; i < /** @type {number} */ (node.start); i += 1) {
+			if (parser.template[i] === '(') num_parens += 1;
+		}
+
+		let index = /** @type {number} */ (node.end);
+		if (node.trailingComments !== undefined && node.trailingComments.length > 0) {
+			index = node.trailingComments.at(-1).end;
+		}
+
+		while (num_parens > 0) {
+			const char = parser.template[index];
+
+			if (char === ')') {
+				num_parens -= 1;
+			} else if (!regex_whitespace.test(char)) {
+				e.expected_token(index, ')');
+			}
+
+			index += 1;
+		}
+
+		parser.index = index;
+
+		return /** @type {Expression} */ (node);
+	} catch (err) {
+		// If we are in an each loop we need the error to be thrown in cases like
+		// `as { y = z }` so we still throw and handle the error there
+		if (parser.loose && !disallow_loose) {
+			const expression = get_loose_identifier(parser, opening_token);
+			if (expression) {
+				return expression;
+			}
+		}
+
+		parser.acorn_error(err);
+	}
+}

node_modules/svelte/src/compiler/phases/1-parse/read/options.js

@@ -0,0 +1,261 @@
+/** @import { ObjectExpression } from 'estree' */
+/** @import { AST } from '#compiler' */
+import { NAMESPACE_MATHML, NAMESPACE_SVG } from '../../../../constants.js';
+import * as e from '../../../errors.js';
+
+/**
+ * @param {AST.SvelteOptionsRaw} node
+ * @returns {AST.Root['options']}
+ */
+export default function read_options(node) {
+	/** @type {AST.SvelteOptions} */
+	const component_options = {
+		start: node.start,
+		end: node.end,
+		// @ts-ignore
+		attributes: node.attributes
+	};
+
+	if (!node) {
+		return component_options;
+	}
+
+	for (const attribute of node.attributes) {
+		if (attribute.type !== 'Attribute') {
+			e.svelte_options_invalid_attribute(attribute);
+		}
+
+		const { name } = attribute;
+
+		switch (name) {
+			case 'runes': {
+				component_options.runes = get_boolean_value(attribute);
+				break;
+			}
+			case 'tag': {
+				e.svelte_options_deprecated_tag(attribute);
+				break; // eslint doesn't know this is unnecessary
+			}
+			case 'customElement': {
+				/** @type {AST.SvelteOptions['customElement']} */
+				const ce = {};
+				const { value: v } = attribute;
+				const value = v === true || Array.isArray(v) ? v : [v];
+
+				if (value === true) {
+					e.svelte_options_invalid_customelement(attribute);
+				} else if (value[0].type === 'Text') {
+					const tag = get_static_value(attribute);
+					validate_tag(attribute, tag);
+					ce.tag = tag;
+					component_options.customElement = ce;
+					break;
+				} else if (value[0].expression.type !== 'ObjectExpression') {
+					// Before Svelte 4 it was necessary to explicitly set customElement to null or else you'd get a warning.
+					// This is no longer necessary, but for backwards compat just skip in this case now.
+					if (value[0].expression.type === 'Literal' && value[0].expression.value === null) {
+						break;
+					}
+					e.svelte_options_invalid_customelement(attribute);
+				}
+
+				/** @type {Array<[string, any]>} */
+				const properties = [];
+				for (const property of value[0].expression.properties) {
+					if (
+						property.type !== 'Property' ||
+						property.computed ||
+						property.key.type !== 'Identifier'
+					) {
+						e.svelte_options_invalid_customelement(attribute);
+					}
+					properties.push([property.key.name, property.value]);
+				}
+
+				const tag = properties.find(([name]) => name === 'tag');
+				if (tag) {
+					const tag_value = tag[1]?.value;
+					validate_tag(tag, tag_value);
+					ce.tag = tag_value;
+				}
+
+				const props = properties.find(([name]) => name === 'props')?.[1];
+				if (props) {
+					if (props.type !== 'ObjectExpression') {
+						e.svelte_options_invalid_customelement_props(attribute);
+					}
+					ce.props = {};
+					for (const property of /** @type {ObjectExpression} */ (props).properties) {
+						if (
+							property.type !== 'Property' ||
+							property.computed ||
+							property.key.type !== 'Identifier' ||
+							property.value.type !== 'ObjectExpression'
+						) {
+							e.svelte_options_invalid_customelement_props(attribute);
+						}
+						ce.props[property.key.name] = {};
+						for (const prop of property.value.properties) {
+							if (
+								prop.type !== 'Property' ||
+								prop.computed ||
+								prop.key.type !== 'Identifier' ||
+								prop.value.type !== 'Literal'
+							) {
+								e.svelte_options_invalid_customelement_props(attribute);
+							}
+
+							if (prop.key.name === 'type') {
+								if (
+									['String', 'Number', 'Boolean', 'Array', 'Object'].indexOf(
+										/** @type {string} */ (prop.value.value)
+									) === -1
+								) {
+									e.svelte_options_invalid_customelement_props(attribute);
+								}
+								ce.props[property.key.name].type = /** @type {any} */ (prop.value.value);
+							} else if (prop.key.name === 'reflect') {
+								if (typeof prop.value.value !== 'boolean') {
+									e.svelte_options_invalid_customelement_props(attribute);
+								}
+								ce.props[property.key.name].reflect = prop.value.value;
+							} else if (prop.key.name === 'attribute') {
+								if (typeof prop.value.value !== 'string') {
+									e.svelte_options_invalid_customelement_props(attribute);
+								}
+								ce.props[property.key.name].attribute = prop.value.value;
+							} else {
+								e.svelte_options_invalid_customelement_props(attribute);
+							}
+						}
+					}
+				}
+
+				const shadow = properties.find(([name]) => name === 'shadow')?.[1];
+				if (shadow) {
+					const shadowdom = shadow?.value;
+					if (shadowdom !== 'open' && shadowdom !== 'none') {
+						e.svelte_options_invalid_customelement_shadow(shadow);
+					}
+					ce.shadow = shadowdom;
+				}
+
+				const extend = properties.find(([name]) => name === 'extend')?.[1];
+				if (extend) {
+					ce.extend = extend;
+				}
+
+				component_options.customElement = ce;
+				break;
+			}
+			case 'namespace': {
+				const value = get_static_value(attribute);
+
+				if (value === NAMESPACE_SVG) {
+					component_options.namespace = 'svg';
+				} else if (value === NAMESPACE_MATHML) {
+					component_options.namespace = 'mathml';
+				} else if (value === 'html' || value === 'mathml' || value === 'svg') {
+					component_options.namespace = value;
+				} else {
+					e.svelte_options_invalid_attribute_value(attribute, `"html", "mathml" or "svg"`);
+				}
+
+				break;
+			}
+			case 'css': {
+				const value = get_static_value(attribute);
+
+				if (value === 'injected') {
+					component_options.css = value;
+				} else {
+					e.svelte_options_invalid_attribute_value(attribute, `"injected"`);
+				}
+
+				break;
+			}
+			case 'immutable': {
+				component_options.immutable = get_boolean_value(attribute);
+				break;
+			}
+			case 'preserveWhitespace': {
+				component_options.preserveWhitespace = get_boolean_value(attribute);
+				break;
+			}
+			case 'accessors': {
+				component_options.accessors = get_boolean_value(attribute);
+				break;
+			}
+			default:
+				e.svelte_options_unknown_attribute(attribute, name);
+		}
+	}
+
+	return component_options;
+}
+
+/**
+ * @param {any} attribute
+ */
+function get_static_value(attribute) {
+	const { value } = attribute;
+
+	if (value === true) return true;
+
+	const chunk = Array.isArray(value) ? value[0] : value;
+
+	if (!chunk) return true;
+	if (value.length > 1) {
+		return null;
+	}
+	if (chunk.type === 'Text') return chunk.data;
+	if (chunk.expression.type !== 'Literal') {
+		return null;
+	}
+
+	return chunk.expression.value;
+}
+
+/**
+ * @param {any} attribute
+ */
+function get_boolean_value(attribute) {
+	const value = get_static_value(attribute);
+	if (typeof value !== 'boolean') {
+		e.svelte_options_invalid_attribute_value(attribute, 'true or false');
+	}
+	return value;
+}
+
+// https://html.spec.whatwg.org/multipage/custom-elements.html#valid-custom-element-name
+const tag_name_char =
+	'[a-z0-9_.\xB7\xC0-\xD6\xD8-\xF6\xF8-\u037D\u037F-\u1FFF\u200C-\u200D\u203F-\u2040\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD\u{10000}-\u{EFFFF}-]';
+const regex_valid_tag_name = new RegExp(`^[a-z]${tag_name_char}*-${tag_name_char}*$`, 'u');
+const reserved_tag_names = [
+	'annotation-xml',
+	'color-profile',
+	'font-face',
+	'font-face-src',
+	'font-face-uri',
+	'font-face-format',
+	'font-face-name',
+	'missing-glyph'
+];
+
+/**
+ * @param {any} attribute
+ * @param {string | null} tag
+ * @returns {asserts tag is string}
+ */
+function validate_tag(attribute, tag) {
+	if (typeof tag !== 'string') {
+		e.svelte_options_invalid_tagname(attribute);
+	}
+	if (tag) {
+		if (!regex_valid_tag_name.test(tag)) {
+			e.svelte_options_invalid_tagname(attribute);
+		} else if (reserved_tag_names.includes(tag)) {
+			e.svelte_options_reserved_tagname(attribute);
+		}
+	}
+}

node_modules/svelte/src/compiler/phases/1-parse/read/script.js

@@ -0,0 +1,90 @@
+/** @import { Program } from 'estree' */
+/** @import { AST } from '#compiler' */
+/** @import { Parser } from '../index.js' */
+import * as acorn from '../acorn.js';
+import { regex_not_newline_characters } from '../../patterns.js';
+import * as e from '../../../errors.js';
+import * as w from '../../../warnings.js';
+import { is_text_attribute } from '../../../utils/ast.js';
+
+const regex_closing_script_tag = /<\/script\s*>/;
+const regex_starts_with_closing_script_tag = /^<\/script\s*>/;
+
+const RESERVED_ATTRIBUTES = ['server', 'client', 'worker', 'test', 'default'];
+const ALLOWED_ATTRIBUTES = ['context', 'generics', 'lang', 'module'];
+
+/**
+ * @param {Parser} parser
+ * @param {number} start
+ * @param {Array<AST.Attribute | AST.SpreadAttribute | AST.Directive>} attributes
+ * @returns {AST.Script}
+ */
+export function read_script(parser, start, attributes) {
+	const script_start = parser.index;
+	const data = parser.read_until(regex_closing_script_tag);
+	if (parser.index >= parser.template.length) {
+		e.element_unclosed(parser.template.length, 'script');
+	}
+
+	const source =
+		parser.template.slice(0, script_start).replace(regex_not_newline_characters, ' ') + data;
+	parser.read(regex_starts_with_closing_script_tag);
+
+	/** @type {Program} */
+	let ast;
+
+	try {
+		ast = acorn.parse(source, parser.ts, true);
+	} catch (err) {
+		parser.acorn_error(err);
+	}
+
+	// TODO is this necessary?
+	ast.start = script_start;
+
+	/** @type {'default' | 'module'} */
+	let context = 'default';
+
+	for (const attribute of /** @type {AST.Attribute[]} */ (attributes)) {
+		if (RESERVED_ATTRIBUTES.includes(attribute.name)) {
+			e.script_reserved_attribute(attribute, attribute.name);
+		}
+
+		if (!ALLOWED_ATTRIBUTES.includes(attribute.name)) {
+			w.script_unknown_attribute(attribute);
+		}
+
+		if (attribute.name === 'module') {
+			if (attribute.value !== true) {
+				// Deliberately a generic code to future-proof for potential other attributes
+				e.script_invalid_attribute_value(attribute, attribute.name);
+			}
+
+			context = 'module';
+		}
+
+		if (attribute.name === 'context') {
+			if (attribute.value === true || !is_text_attribute(attribute)) {
+				e.script_invalid_context(attribute);
+			}
+
+			const value = attribute.value[0].data;
+
+			if (value !== 'module') {
+				e.script_invalid_context(attribute);
+			}
+
+			context = 'module';
+		}
+	}
+
+	return {
+		type: 'Script',
+		start,
+		end: parser.index,
+		context,
+		content: ast,
+		// @ts-ignore
+		attributes
+	};
+}

node_modules/svelte/src/compiler/phases/1-parse/read/style.js

@@ -0,0 +1,625 @@
+/** @import { AST } from '#compiler' */
+/** @import { Parser } from '../index.js' */
+import * as e from '../../../errors.js';
+
+const REGEX_MATCHER = /^[~^$*|]?=/;
+const REGEX_CLOSING_BRACKET = /[\s\]]/;
+const REGEX_ATTRIBUTE_FLAGS = /^[a-zA-Z]+/; // only `i` and `s` are valid today, but make it future-proof
+const REGEX_COMBINATOR = /^(\+|~|>|\|\|)/;
+const REGEX_PERCENTAGE = /^\d+(\.\d+)?%/;
+const REGEX_NTH_OF =
+	/^(even|odd|\+?(\d+|\d*n(\s*[+-]\s*\d+)?)|-\d*n(\s*\+\s*\d+))((?=\s*[,)])|\s+of\s+)/;
+const REGEX_WHITESPACE_OR_COLON = /[\s:]/;
+const REGEX_LEADING_HYPHEN_OR_DIGIT = /-?\d/;
+const REGEX_VALID_IDENTIFIER_CHAR = /[a-zA-Z0-9_-]/;
+const REGEX_COMMENT_CLOSE = /\*\//;
+const REGEX_HTML_COMMENT_CLOSE = /-->/;
+
+/**
+ * @param {Parser} parser
+ * @param {number} start
+ * @param {Array<AST.Attribute | AST.SpreadAttribute | AST.Directive>} attributes
+ * @returns {AST.CSS.StyleSheet}
+ */
+export default function read_style(parser, start, attributes) {
+	const content_start = parser.index;
+	const children = read_body(parser, '</style');
+	const content_end = parser.index;
+
+	parser.read(/^<\/style\s*>/);
+
+	return {
+		type: 'StyleSheet',
+		start,
+		end: parser.index,
+		attributes,
+		children,
+		content: {
+			start: content_start,
+			end: content_end,
+			styles: parser.template.slice(content_start, content_end),
+			comment: null
+		}
+	};
+}
+
+/**
+ * @param {Parser} parser
+ * @param {string} close
+ * @returns {any[]}
+ */
+function read_body(parser, close) {
+	/** @type {Array<AST.CSS.Rule | AST.CSS.Atrule>} */
+	const children = [];
+
+	while (parser.index < parser.template.length) {
+		allow_comment_or_whitespace(parser);
+
+		if (parser.match(close)) {
+			return children;
+		}
+
+		if (parser.match('@')) {
+			children.push(read_at_rule(parser));
+		} else {
+			children.push(read_rule(parser));
+		}
+	}
+
+	e.expected_token(parser.template.length, close);
+}
+
+/**
+ * @param {Parser} parser
+ * @returns {AST.CSS.Atrule}
+ */
+function read_at_rule(parser) {
+	const start = parser.index;
+	parser.eat('@', true);
+
+	const name = read_identifier(parser);
+
+	const prelude = read_value(parser);
+
+	/** @type {AST.CSS.Block | null} */
+	let block = null;
+
+	if (parser.match('{')) {
+		// e.g. `@media (...) {...}`
+		block = read_block(parser);
+	} else {
+		// e.g. `@import '...'`
+		parser.eat(';', true);
+	}
+
+	return {
+		type: 'Atrule',
+		start,
+		end: parser.index,
+		name,
+		prelude,
+		block
+	};
+}
+
+/**
+ * @param {Parser} parser
+ * @returns {AST.CSS.Rule}
+ */
+function read_rule(parser) {
+	const start = parser.index;
+
+	return {
+		type: 'Rule',
+		prelude: read_selector_list(parser),
+		block: read_block(parser),
+		start,
+		end: parser.index,
+		metadata: {
+			parent_rule: null,
+			has_local_selectors: false,
+			is_global_block: false
+		}
+	};
+}
+
+/**
+ * @param {Parser} parser
+ * @param {boolean} [inside_pseudo_class]
+ * @returns {AST.CSS.SelectorList}
+ */
+function read_selector_list(parser, inside_pseudo_class = false) {
+	/** @type {AST.CSS.ComplexSelector[]} */
+	const children = [];
+
+	allow_comment_or_whitespace(parser);
+
+	const start = parser.index;
+
+	while (parser.index < parser.template.length) {
+		children.push(read_selector(parser, inside_pseudo_class));
+
+		const end = parser.index;
+
+		allow_comment_or_whitespace(parser);
+
+		if (inside_pseudo_class ? parser.match(')') : parser.match('{')) {
+			return {
+				type: 'SelectorList',
+				start,
+				end,
+				children
+			};
+		} else {
+			parser.eat(',', true);
+			allow_comment_or_whitespace(parser);
+		}
+	}
+
+	e.unexpected_eof(parser.template.length);
+}
+
+/**
+ * @param {Parser} parser
+ * @param {boolean} [inside_pseudo_class]
+ * @returns {AST.CSS.ComplexSelector}
+ */
+function read_selector(parser, inside_pseudo_class = false) {
+	const list_start = parser.index;
+
+	/** @type {AST.CSS.RelativeSelector[]} */
+	const children = [];
+
+	/**
+	 * @param {AST.CSS.Combinator | null} combinator
+	 * @param {number} start
+	 * @returns {AST.CSS.RelativeSelector}
+	 */
+	function create_selector(combinator, start) {
+		return {
+			type: 'RelativeSelector',
+			combinator,
+			selectors: [],
+			start,
+			end: -1,
+			metadata: {
+				is_global: false,
+				is_global_like: false,
+				scoped: false
+			}
+		};
+	}
+
+	/** @type {AST.CSS.RelativeSelector} */
+	let relative_selector = create_selector(null, parser.index);
+
+	while (parser.index < parser.template.length) {
+		let start = parser.index;
+
+		if (parser.eat('&')) {
+			relative_selector.selectors.push({
+				type: 'NestingSelector',
+				name: '&',
+				start,
+				end: parser.index
+			});
+		} else if (parser.eat('*')) {
+			let name = '*';
+
+			if (parser.eat('|')) {
+				// * is the namespace (which we ignore)
+				name = read_identifier(parser);
+			}
+
+			relative_selector.selectors.push({
+				type: 'TypeSelector',
+				name,
+				start,
+				end: parser.index
+			});
+		} else if (parser.eat('#')) {
+			relative_selector.selectors.push({
+				type: 'IdSelector',
+				name: read_identifier(parser),
+				start,
+				end: parser.index
+			});
+		} else if (parser.eat('.')) {
+			relative_selector.selectors.push({
+				type: 'ClassSelector',
+				name: read_identifier(parser),
+				start,
+				end: parser.index
+			});
+		} else if (parser.eat('::')) {
+			relative_selector.selectors.push({
+				type: 'PseudoElementSelector',
+				name: read_identifier(parser),
+				start,
+				end: parser.index
+			});
+			// We read the inner selectors of a pseudo element to ensure it parses correctly,
+			// but we don't do anything with the result.
+			if (parser.eat('(')) {
+				read_selector_list(parser, true);
+				parser.eat(')', true);
+			}
+		} else if (parser.eat(':')) {
+			const name = read_identifier(parser);
+
+			/** @type {null | AST.CSS.SelectorList} */
+			let args = null;
+
+			if (parser.eat('(')) {
+				args = read_selector_list(parser, true);
+				parser.eat(')', true);
+			}
+
+			relative_selector.selectors.push({
+				type: 'PseudoClassSelector',
+				name,
+				args,
+				start,
+				end: parser.index
+			});
+		} else if (parser.eat('[')) {
+			parser.allow_whitespace();
+			const name = read_identifier(parser);
+			parser.allow_whitespace();
+
+			/** @type {string | null} */
+			let value = null;
+
+			const matcher = parser.read(REGEX_MATCHER);
+
+			if (matcher) {
+				parser.allow_whitespace();
+				value = read_attribute_value(parser);
+			}
+
+			parser.allow_whitespace();
+
+			const flags = parser.read(REGEX_ATTRIBUTE_FLAGS);
+
+			parser.allow_whitespace();
+			parser.eat(']', true);
+
+			relative_selector.selectors.push({
+				type: 'AttributeSelector',
+				start,
+				end: parser.index,
+				name,
+				matcher,
+				value,
+				flags
+			});
+		} else if (inside_pseudo_class && parser.match_regex(REGEX_NTH_OF)) {
+			// nth of matcher must come before combinator matcher to prevent collision else the '+' in '+2n-1' would be parsed as a combinator
+
+			relative_selector.selectors.push({
+				type: 'Nth',
+				value: /**@type {string} */ (parser.read(REGEX_NTH_OF)),
+				start,
+				end: parser.index
+			});
+		} else if (parser.match_regex(REGEX_PERCENTAGE)) {
+			relative_selector.selectors.push({
+				type: 'Percentage',
+				value: /** @type {string} */ (parser.read(REGEX_PERCENTAGE)),
+				start,
+				end: parser.index
+			});
+		} else if (!parser.match_regex(REGEX_COMBINATOR)) {
+			let name = read_identifier(parser);
+
+			if (parser.eat('|')) {
+				// we ignore the namespace when trying to find matching element classes
+				name = read_identifier(parser);
+			}
+
+			relative_selector.selectors.push({
+				type: 'TypeSelector',
+				name,
+				start,
+				end: parser.index
+			});
+		}
+
+		const index = parser.index;
+		allow_comment_or_whitespace(parser);
+
+		if (parser.match(',') || (inside_pseudo_class ? parser.match(')') : parser.match('{'))) {
+			// rewind, so we know whether to continue building the selector list
+			parser.index = index;
+
+			relative_selector.end = index;
+			children.push(relative_selector);
+
+			return {
+				type: 'ComplexSelector',
+				start: list_start,
+				end: index,
+				children,
+				metadata: {
+					rule: null,
+					used: false
+				}
+			};
+		}
+
+		parser.index = index;
+		const combinator = read_combinator(parser);
+
+		if (combinator) {
+			if (relative_selector.selectors.length > 0) {
+				relative_selector.end = index;
+				children.push(relative_selector);
+			}
+
+			// ...and start a new one
+			relative_selector = create_selector(combinator, combinator.start);
+
+			parser.allow_whitespace();
+
+			if (parser.match(',') || (inside_pseudo_class ? parser.match(')') : parser.match('{'))) {
+				e.css_selector_invalid(parser.index);
+			}
+		}
+	}
+
+	e.unexpected_eof(parser.template.length);
+}
+
+/**
+ * @param {Parser} parser
+ * @returns {AST.CSS.Combinator | null}
+ */
+function read_combinator(parser) {
+	const start = parser.index;
+	parser.allow_whitespace();
+
+	const index = parser.index;
+	const name = parser.read(REGEX_COMBINATOR);
+
+	if (name) {
+		const end = parser.index;
+		parser.allow_whitespace();
+
+		return {
+			type: 'Combinator',
+			name,
+			start: index,
+			end
+		};
+	}
+
+	if (parser.index !== start) {
+		return {
+			type: 'Combinator',
+			name: ' ',
+			start,
+			end: parser.index
+		};
+	}
+
+	return null;
+}
+
+/**
+ * @param {Parser} parser
+ * @returns {AST.CSS.Block}
+ */
+function read_block(parser) {
+	const start = parser.index;
+
+	parser.eat('{', true);
+
+	/** @type {Array<AST.CSS.Declaration | AST.CSS.Rule | AST.CSS.Atrule>} */
+	const children = [];
+
+	while (parser.index < parser.template.length) {
+		allow_comment_or_whitespace(parser);
+
+		if (parser.match('}')) {
+			break;
+		} else {
+			children.push(read_block_item(parser));
+		}
+	}
+
+	parser.eat('}', true);
+
+	return {
+		type: 'Block',
+		start,
+		end: parser.index,
+		children
+	};
+}
+
+/**
+ * Reads a declaration, rule or at-rule
+ *
+ * @param {Parser} parser
+ * @returns {AST.CSS.Declaration | AST.CSS.Rule | AST.CSS.Atrule}
+ */
+function read_block_item(parser) {
+	if (parser.match('@')) {
+		return read_at_rule(parser);
+	}
+
+	// read ahead to understand whether we're dealing with a declaration or a nested rule.
+	// this involves some duplicated work, but avoids a try-catch that would disguise errors
+	const start = parser.index;
+	read_value(parser);
+	const char = parser.template[parser.index];
+	parser.index = start;
+
+	return char === '{' ? read_rule(parser) : read_declaration(parser);
+}
+
+/**
+ * @param {Parser} parser
+ * @returns {AST.CSS.Declaration}
+ */
+function read_declaration(parser) {
+	const start = parser.index;
+
+	const property = parser.read_until(REGEX_WHITESPACE_OR_COLON);
+	parser.allow_whitespace();
+	parser.eat(':');
+	let index = parser.index;
+	parser.allow_whitespace();
+
+	const value = read_value(parser);
+
+	if (!value && !property.startsWith('--')) {
+		e.css_empty_declaration({ start, end: index });
+	}
+
+	const end = parser.index;
+
+	if (!parser.match('}')) {
+		parser.eat(';', true);
+	}
+
+	return {
+		type: 'Declaration',
+		start,
+		end,
+		property,
+		value
+	};
+}
+
+/**
+ * @param {Parser} parser
+ * @returns {string}
+ */
+function read_value(parser) {
+	let value = '';
+	let escaped = false;
+	let in_url = false;
+
+	/** @type {null | '"' | "'"} */
+	let quote_mark = null;
+
+	while (parser.index < parser.template.length) {
+		const char = parser.template[parser.index];
+
+		if (escaped) {
+			value += '\\' + char;
+			escaped = false;
+		} else if (char === '\\') {
+			escaped = true;
+		} else if (char === quote_mark) {
+			quote_mark = null;
+		} else if (char === ')') {
+			in_url = false;
+		} else if (quote_mark === null && (char === '"' || char === "'")) {
+			quote_mark = char;
+		} else if (char === '(' && value.slice(-3) === 'url') {
+			in_url = true;
+		} else if ((char === ';' || char === '{' || char === '}') && !in_url && !quote_mark) {
+			return value.trim();
+		}
+
+		value += char;
+
+		parser.index++;
+	}
+
+	e.unexpected_eof(parser.template.length);
+}
+
+/**
+ * Read a property that may or may not be quoted, e.g.
+ * `foo` or `'foo bar'` or `"foo bar"`
+ * @param {Parser} parser
+ */
+function read_attribute_value(parser) {
+	let value = '';
+	let escaped = false;
+	const quote_mark = parser.eat('"') ? '"' : parser.eat("'") ? "'" : null;
+
+	while (parser.index < parser.template.length) {
+		const char = parser.template[parser.index];
+		if (escaped) {
+			value += '\\' + char;
+			escaped = false;
+		} else if (char === '\\') {
+			escaped = true;
+		} else if (quote_mark ? char === quote_mark : REGEX_CLOSING_BRACKET.test(char)) {
+			if (quote_mark) {
+				parser.eat(quote_mark, true);
+			}
+
+			return value.trim();
+		} else {
+			value += char;
+		}
+
+		parser.index++;
+	}
+
+	e.unexpected_eof(parser.template.length);
+}
+
+/**
+ * https://www.w3.org/TR/CSS21/syndata.html#value-def-identifier
+ * @param {Parser} parser
+ */
+function read_identifier(parser) {
+	const start = parser.index;
+
+	let identifier = '';
+
+	if (parser.match('--') || parser.match_regex(REGEX_LEADING_HYPHEN_OR_DIGIT)) {
+		e.css_expected_identifier(start);
+	}
+
+	let escaped = false;
+
+	while (parser.index < parser.template.length) {
+		const char = parser.template[parser.index];
+		if (escaped) {
+			identifier += '\\' + char;
+			escaped = false;
+		} else if (char === '\\') {
+			escaped = true;
+		} else if (
+			/** @type {number} */ (char.codePointAt(0)) >= 160 ||
+			REGEX_VALID_IDENTIFIER_CHAR.test(char)
+		) {
+			identifier += char;
+		} else {
+			break;
+		}
+
+		parser.index++;
+	}
+
+	if (identifier === '') {
+		e.css_expected_identifier(start);
+	}
+
+	return identifier;
+}
+
+/** @param {Parser} parser */
+function allow_comment_or_whitespace(parser) {
+	parser.allow_whitespace();
+	while (parser.match('/*') || parser.match('<!--')) {
+		if (parser.eat('/*')) {
+			parser.read_until(REGEX_COMMENT_CLOSE);
+			parser.eat('*/', true);
+		}
+
+		if (parser.eat('<!--')) {
+			parser.read_until(REGEX_HTML_COMMENT_CLOSE);
+			parser.eat('-->', true);
+		}
+
+		parser.allow_whitespace();
+	}
+}

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

@@ -0,0 +1,147 @@
+/** @import { Context, Visitors } from 'zimmerframe' */
+/** @import { FunctionExpression, FunctionDeclaration } from 'estree' */
+import { walk } from 'zimmerframe';
+import * as b from '../../utils/builders.js';
+import * as e from '../../errors.js';
+
+/**
+ * @param {FunctionExpression | FunctionDeclaration} node
+ * @param {Context<any, any>} context
+ */
+function remove_this_param(node, context) {
+	if (node.params[0]?.type === 'Identifier' && node.params[0].name === 'this') {
+		node.params.shift();
+	}
+	return context.next();
+}
+
+/** @type {Visitors<any, null>} */
+const visitors = {
+	_(node, context) {
+		const n = context.next() ?? node;
+
+		// TODO there may come a time when we decide to preserve type annotations.
+		// until that day comes, we just delete them so they don't confuse esrap
+		delete n.typeAnnotation;
+		delete n.typeParameters;
+		delete n.returnType;
+		delete n.accessibility;
+	},
+	Decorator(node) {
+		e.typescript_invalid_feature(node, 'decorators (related TSC proposal is not stage 4 yet)');
+	},
+	ImportDeclaration(node) {
+		if (node.importKind === 'type') return b.empty;
+
+		if (node.specifiers?.length > 0) {
+			const specifiers = node.specifiers.filter((/** @type {any} */ s) => s.importKind !== 'type');
+			if (specifiers.length === 0) return b.empty;
+
+			return { ...node, specifiers };
+		}
+
+		return node;
+	},
+	ExportNamedDeclaration(node, context) {
+		if (node.exportKind === 'type') return b.empty;
+
+		if (node.declaration) {
+			const result = context.next();
+			if (result?.declaration?.type === 'EmptyStatement') {
+				return b.empty;
+			}
+			return result;
+		}
+
+		if (node.specifiers) {
+			const specifiers = node.specifiers.filter((/** @type {any} */ s) => s.exportKind !== 'type');
+			if (specifiers.length === 0) return b.empty;
+
+			return { ...node, specifiers };
+		}
+
+		return node;
+	},
+	ExportDefaultDeclaration(node) {
+		if (node.exportKind === 'type') return b.empty;
+		return node;
+	},
+	ExportAllDeclaration(node) {
+		if (node.exportKind === 'type') return b.empty;
+		return node;
+	},
+	PropertyDefinition(node, { next }) {
+		if (node.accessor) {
+			e.typescript_invalid_feature(
+				node,
+				'accessor fields (related TSC proposal is not stage 4 yet)'
+			);
+		}
+		return next();
+	},
+	TSAsExpression(node, context) {
+		return context.visit(node.expression);
+	},
+	TSSatisfiesExpression(node, context) {
+		return context.visit(node.expression);
+	},
+	TSNonNullExpression(node, context) {
+		return context.visit(node.expression);
+	},
+	TSInterfaceDeclaration() {
+		return b.empty;
+	},
+	TSTypeAliasDeclaration() {
+		return b.empty;
+	},
+	TSEnumDeclaration(node) {
+		e.typescript_invalid_feature(node, 'enums');
+	},
+	TSParameterProperty(node, context) {
+		if ((node.readonly || node.accessibility) && context.path.at(-2)?.kind === 'constructor') {
+			e.typescript_invalid_feature(node, 'accessibility modifiers on constructor parameters');
+		}
+		return context.visit(node.parameter);
+	},
+	TSInstantiationExpression(node, context) {
+		return context.visit(node.expression);
+	},
+	FunctionExpression: remove_this_param,
+	FunctionDeclaration: remove_this_param,
+	TSDeclareFunction() {
+		return b.empty;
+	},
+	ClassDeclaration(node, context) {
+		if (node.declare) {
+			return b.empty;
+		}
+		delete node.implements;
+		return context.next();
+	},
+	VariableDeclaration(node, context) {
+		if (node.declare) {
+			return b.empty;
+		}
+		return context.next();
+	},
+	TSModuleDeclaration(node, context) {
+		if (!node.body) return b.empty;
+
+		// namespaces can contain non-type nodes
+		const cleaned = /** @type {any[]} */ (node.body.body).map((entry) => context.visit(entry));
+		if (cleaned.some((entry) => entry !== b.empty)) {
+			e.typescript_invalid_feature(node, 'namespaces with non-type nodes');
+		}
+
+		return b.empty;
+	}
+};
+
+/**
+ * @template T
+ * @param {T} ast
+ * @returns {T}
+ */
+export function remove_typescript_nodes(ast) {
+	return walk(ast, null, visitors);
+}

node_modules/svelte/src/compiler/phases/1-parse/state/element.js

@@ -0,0 +1,823 @@
+/** @import { Expression } from 'estree' */
+/** @import { AST } from '#compiler' */
+/** @import { Parser } from '../index.js' */
+import { is_void } from '../../../../utils.js';
+import read_expression from '../read/expression.js';
+import { read_script } from '../read/script.js';
+import read_style from '../read/style.js';
+import { decode_character_references } from '../utils/html.js';
+import * as e from '../../../errors.js';
+import * as w from '../../../warnings.js';
+import { create_fragment } from '../utils/create.js';
+import { create_attribute, create_expression_metadata, is_element_node } from '../../nodes.js';
+import { get_attribute_expression, is_expression_attribute } from '../../../utils/ast.js';
+import { closing_tag_omitted } from '../../../../html-tree-validation.js';
+import { list } from '../../../utils/string.js';
+import { regex_whitespace } from '../../patterns.js';
+
+const regex_invalid_unquoted_attribute_value = /^(\/>|[\s"'=<>`])/;
+const regex_closing_textarea_tag = /^<\/textarea(\s[^>]*)?>/i;
+const regex_closing_comment = /-->/;
+const regex_whitespace_or_slash_or_closing_tag = /(\s|\/|>)/;
+const regex_token_ending_character = /[\s=/>"']/;
+const regex_starts_with_quote_characters = /^["']/;
+const regex_attribute_value = /^(?:"([^"]*)"|'([^'])*'|([^>\s]+))/;
+const regex_valid_element_name =
+	/^(?:![a-zA-Z]+|[a-zA-Z](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?|[a-zA-Z][a-zA-Z0-9]*:[a-zA-Z][a-zA-Z0-9-]*[a-zA-Z0-9])$/;
+export const regex_valid_component_name =
+	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Lexical_grammar#identifiers adjusted for our needs
+	// (must start with uppercase letter if no dots, can contain dots)
+	/^(?:\p{Lu}[$\u200c\u200d\p{ID_Continue}.]*|\p{ID_Start}[$\u200c\u200d\p{ID_Continue}]*(?:\.[$\u200c\u200d\p{ID_Continue}]+)+)$/u;
+
+/** @type {Map<string, AST.ElementLike['type']>} */
+const root_only_meta_tags = new Map([
+	['svelte:head', 'SvelteHead'],
+	['svelte:options', 'SvelteOptions'],
+	['svelte:window', 'SvelteWindow'],
+	['svelte:document', 'SvelteDocument'],
+	['svelte:body', 'SvelteBody']
+]);
+
+/** @type {Map<string, AST.ElementLike['type']>} */
+const meta_tags = new Map([
+	...root_only_meta_tags,
+	['svelte:element', 'SvelteElement'],
+	['svelte:component', 'SvelteComponent'],
+	['svelte:self', 'SvelteSelf'],
+	['svelte:fragment', 'SvelteFragment'],
+	['svelte:boundary', 'SvelteBoundary']
+]);
+
+/** @param {Parser} parser */
+export default function element(parser) {
+	const start = parser.index++;
+
+	let parent = parser.current();
+
+	if (parser.eat('!--')) {
+		const data = parser.read_until(regex_closing_comment);
+		parser.eat('-->', true);
+
+		parser.append({
+			type: 'Comment',
+			start,
+			end: parser.index,
+			data
+		});
+
+		return;
+	}
+
+	const is_closing_tag = parser.eat('/');
+	const name = parser.read_until(regex_whitespace_or_slash_or_closing_tag);
+
+	if (is_closing_tag) {
+		parser.allow_whitespace();
+		parser.eat('>', true);
+
+		if (is_void(name)) {
+			e.void_element_invalid_content(start);
+		}
+
+		// close any elements that don't have their own closing tags, e.g. <div><p></div>
+		while (/** @type {AST.RegularElement} */ (parent).name !== name) {
+			if (parser.loose) {
+				// If the previous element did interpret the next opening tag as an attribute, backtrack
+				if (is_element_node(parent)) {
+					const last = parent.attributes.at(-1);
+					if (last?.type === 'Attribute' && last.name === `<${name}`) {
+						parser.index = last.start;
+						parent.attributes.pop();
+						break;
+					}
+				}
+			}
+
+			if (parent.type !== 'RegularElement' && !parser.loose) {
+				if (parser.last_auto_closed_tag && parser.last_auto_closed_tag.tag === name) {
+					e.element_invalid_closing_tag_autoclosed(start, name, parser.last_auto_closed_tag.reason);
+				} else {
+					e.element_invalid_closing_tag(start, name);
+				}
+			}
+
+			parent.end = start;
+			parser.pop();
+
+			parent = parser.current();
+		}
+
+		parent.end = parser.index;
+		parser.pop();
+
+		if (parser.last_auto_closed_tag && parser.stack.length < parser.last_auto_closed_tag.depth) {
+			parser.last_auto_closed_tag = undefined;
+		}
+
+		return;
+	}
+
+	if (name.startsWith('svelte:') && !meta_tags.has(name)) {
+		const bounds = { start: start + 1, end: start + 1 + name.length };
+		e.svelte_meta_invalid_tag(bounds, list(Array.from(meta_tags.keys())));
+	}
+
+	if (!regex_valid_element_name.test(name) && !regex_valid_component_name.test(name)) {
+		// <div. -> in the middle of typing -> allow in loose mode
+		if (!parser.loose || !name.endsWith('.')) {
+			const bounds = { start: start + 1, end: start + 1 + name.length };
+			e.tag_invalid_name(bounds);
+		}
+	}
+
+	if (root_only_meta_tags.has(name)) {
+		if (name in parser.meta_tags) {
+			e.svelte_meta_duplicate(start, name);
+		}
+
+		if (parent.type !== 'Root') {
+			e.svelte_meta_invalid_placement(start, name);
+		}
+
+		parser.meta_tags[name] = true;
+	}
+
+	const type = meta_tags.has(name)
+		? meta_tags.get(name)
+		: regex_valid_component_name.test(name) || (parser.loose && name.endsWith('.'))
+			? 'Component'
+			: name === 'title' && parent_is_head(parser.stack)
+				? 'TitleElement'
+				: // TODO Svelte 6/7: once slots are removed in favor of snippets, always keep slot as a regular element
+					name === 'slot' && !parent_is_shadowroot_template(parser.stack)
+					? 'SlotElement'
+					: 'RegularElement';
+
+	/** @type {AST.ElementLike} */
+	const element =
+		type === 'RegularElement'
+			? {
+					type,
+					start,
+					end: -1,
+					name,
+					attributes: [],
+					fragment: create_fragment(true),
+					metadata: {
+						svg: false,
+						mathml: false,
+						scoped: false,
+						has_spread: false,
+						path: []
+					}
+				}
+			: /** @type {AST.ElementLike} */ ({
+					type,
+					start,
+					end: -1,
+					name,
+					attributes: [],
+					fragment: create_fragment(true),
+					metadata: {
+						// unpopulated at first, differs between types
+					}
+				});
+
+	parser.allow_whitespace();
+
+	if (parent.type === 'RegularElement' && closing_tag_omitted(parent.name, name)) {
+		parent.end = start;
+		parser.pop();
+		parser.last_auto_closed_tag = {
+			tag: parent.name,
+			reason: name,
+			depth: parser.stack.length
+		};
+	}
+
+	/** @type {string[]} */
+	const unique_names = [];
+
+	const current = parser.current();
+	const is_top_level_script_or_style =
+		(name === 'script' || name === 'style') && current.type === 'Root';
+
+	const read = is_top_level_script_or_style ? read_static_attribute : read_attribute;
+
+	let attribute;
+	while ((attribute = read(parser))) {
+		// animate and transition can only be specified once per element so no need
+		// to check here, use can be used multiple times, same for the on directive
+		// finally let already has error handling in case of duplicate variable names
+		if (
+			attribute.type === 'Attribute' ||
+			attribute.type === 'BindDirective' ||
+			attribute.type === 'StyleDirective' ||
+			attribute.type === 'ClassDirective'
+		) {
+			// `bind:attribute` and `attribute` are just the same but `class:attribute`,
+			// `style:attribute` and `attribute` are different and should be allowed together
+			// so we concatenate the type while normalizing the type for BindDirective
+			const type = attribute.type === 'BindDirective' ? 'Attribute' : attribute.type;
+			if (unique_names.includes(type + attribute.name)) {
+				e.attribute_duplicate(attribute);
+				// <svelte:element bind:this this=..> is allowed
+			} else if (attribute.name !== 'this') {
+				unique_names.push(type + attribute.name);
+			}
+		}
+
+		element.attributes.push(attribute);
+		parser.allow_whitespace();
+	}
+
+	if (element.type === 'SvelteComponent') {
+		const index = element.attributes.findIndex(
+			/** @param {any} attr */
+			(attr) => attr.type === 'Attribute' && attr.name === 'this'
+		);
+		if (index === -1) {
+			e.svelte_component_missing_this(start);
+		}
+
+		const definition = /** @type {AST.Attribute} */ (element.attributes.splice(index, 1)[0]);
+		if (!is_expression_attribute(definition)) {
+			e.svelte_component_invalid_this(definition.start);
+		}
+
+		element.expression = get_attribute_expression(definition);
+	}
+
+	if (element.type === 'SvelteElement') {
+		const index = element.attributes.findIndex(
+			/** @param {any} attr */
+			(attr) => attr.type === 'Attribute' && attr.name === 'this'
+		);
+		if (index === -1) {
+			e.svelte_element_missing_this(start);
+		}
+
+		const definition = /** @type {AST.Attribute} */ (element.attributes.splice(index, 1)[0]);
+
+		if (definition.value === true) {
+			e.svelte_element_missing_this(definition);
+		}
+
+		if (!is_expression_attribute(definition)) {
+			w.svelte_element_invalid_this(definition);
+
+			// note that this is wrong, in the case of e.g. `this="h{n}"` — it will result in `<h>`.
+			// it would be much better to just error here, but we are preserving the existing buggy
+			// Svelte 4 behaviour out of an overabundance of caution regarding breaking changes.
+			// TODO in 6.0, error
+			const chunk = /** @type {Array<AST.ExpressionTag | AST.Text>} */ (definition.value)[0];
+			element.tag =
+				chunk.type === 'Text'
+					? {
+							type: 'Literal',
+							value: chunk.data,
+							raw: `'${chunk.raw}'`,
+							start: chunk.start,
+							end: chunk.end
+						}
+					: chunk.expression;
+		} else {
+			element.tag = get_attribute_expression(definition);
+		}
+	}
+
+	if (is_top_level_script_or_style) {
+		parser.eat('>', true);
+
+		/** @type {AST.Comment | null} */
+		let prev_comment = null;
+		for (let i = current.fragment.nodes.length - 1; i >= 0; i--) {
+			const node = current.fragment.nodes[i];
+
+			if (i === current.fragment.nodes.length - 1 && node.end !== start) {
+				break;
+			}
+
+			if (node.type === 'Comment') {
+				prev_comment = node;
+				break;
+			} else if (node.type !== 'Text' || node.data.trim()) {
+				break;
+			}
+		}
+
+		if (name === 'script') {
+			const content = read_script(parser, start, element.attributes);
+			if (prev_comment) {
+				// We take advantage of the fact that the root will never have leadingComments set,
+				// and set the previous comment to it so that the warning mechanism can later
+				// inspect the root and see if there was a html comment before it silencing specific warnings.
+				content.content.leadingComments = [{ type: 'Line', value: prev_comment.data }];
+			}
+
+			if (content.context === 'module') {
+				if (current.module) e.script_duplicate(start);
+				current.module = content;
+			} else {
+				if (current.instance) e.script_duplicate(start);
+				current.instance = content;
+			}
+		} else {
+			const content = read_style(parser, start, element.attributes);
+			content.content.comment = prev_comment;
+
+			if (current.css) e.style_duplicate(start);
+			current.css = content;
+		}
+		return;
+	}
+
+	parser.append(element);
+
+	const self_closing = parser.eat('/') || is_void(name);
+	const closed = parser.eat('>', true, false);
+
+	// Loose parsing mode
+	if (!closed) {
+		// We may have eaten an opening `<` of the next element and treated it as an attribute...
+		const last = element.attributes.at(-1);
+		if (last?.type === 'Attribute' && last.name === '<') {
+			parser.index = last.start;
+			element.attributes.pop();
+		} else {
+			// ... or we may have eaten part of a following block ...
+			const prev_1 = parser.template[parser.index - 1];
+			const prev_2 = parser.template[parser.index - 2];
+			const current = parser.template[parser.index];
+			if (prev_2 === '{' && prev_1 === '/') {
+				parser.index -= 2;
+			} else if (prev_1 === '{' && (current === '#' || current === '@' || current === ':')) {
+				parser.index -= 1;
+			} else {
+				// ... or we're followed by whitespace, for example near the end of the template,
+				// which we want to take in so that language tools has more room to work with
+				parser.allow_whitespace();
+				if (parser.index === parser.template.length) {
+					while (
+						parser.index < parser.template_untrimmed.length &&
+						regex_whitespace.test(parser.template_untrimmed[parser.index])
+					) {
+						parser.index++;
+					}
+				}
+			}
+		}
+	}
+
+	if (self_closing || !closed) {
+		// don't push self-closing elements onto the stack
+		element.end = parser.index;
+	} else if (name === 'textarea') {
+		// special case
+		element.fragment.nodes = read_sequence(
+			parser,
+			() => regex_closing_textarea_tag.test(parser.template.slice(parser.index)),
+			'inside <textarea>'
+		);
+		parser.read(regex_closing_textarea_tag);
+		element.end = parser.index;
+	} else if (name === 'script' || name === 'style') {
+		// special case
+		const start = parser.index;
+		const data = parser.read_until(new RegExp(`</${name}>`));
+		const end = parser.index;
+
+		/** @type {AST.Text} */
+		const node = {
+			start,
+			end,
+			type: 'Text',
+			data,
+			raw: data
+		};
+
+		element.fragment.nodes.push(node);
+		parser.eat(`</${name}>`, true);
+		element.end = parser.index;
+	} else {
+		parser.stack.push(element);
+		parser.fragments.push(element.fragment);
+	}
+}
+
+/** @param {AST.TemplateNode[]} stack */
+function parent_is_head(stack) {
+	let i = stack.length;
+	while (i--) {
+		const { type } = stack[i];
+		if (type === 'SvelteHead') return true;
+		if (type === 'RegularElement' || type === 'Component') return false;
+	}
+	return false;
+}
+
+/** @param {AST.TemplateNode[]} stack */
+function parent_is_shadowroot_template(stack) {
+	// https://developer.chrome.com/docs/css-ui/declarative-shadow-dom#building_a_declarative_shadow_root
+	let i = stack.length;
+	while (i--) {
+		if (
+			stack[i].type === 'RegularElement' &&
+			/** @type {AST.RegularElement} */ (stack[i]).attributes.some(
+				(a) => a.type === 'Attribute' && a.name === 'shadowrootmode'
+			)
+		) {
+			return true;
+		}
+	}
+	return false;
+}
+
+/**
+ * @param {Parser} parser
+ * @returns {AST.Attribute | null}
+ */
+function read_static_attribute(parser) {
+	const start = parser.index;
+
+	const name = parser.read_until(regex_token_ending_character);
+	if (!name) return null;
+
+	/** @type {true | Array<AST.Text | AST.ExpressionTag>} */
+	let value = true;
+
+	if (parser.eat('=')) {
+		parser.allow_whitespace();
+		let raw = parser.match_regex(regex_attribute_value);
+		if (!raw) {
+			e.expected_attribute_value(parser.index);
+		}
+
+		parser.index += raw.length;
+
+		const quoted = raw[0] === '"' || raw[0] === "'";
+		if (quoted) {
+			raw = raw.slice(1, -1);
+		}
+
+		value = [
+			{
+				start: parser.index - raw.length - (quoted ? 1 : 0),
+				end: quoted ? parser.index - 1 : parser.index,
+				type: 'Text',
+				raw: raw,
+				data: decode_character_references(raw, true)
+			}
+		];
+	}
+
+	if (parser.match_regex(regex_starts_with_quote_characters)) {
+		e.expected_token(parser.index, '=');
+	}
+
+	return create_attribute(name, start, parser.index, value);
+}
+
+/**
+ * @param {Parser} parser
+ * @returns {AST.Attribute | AST.SpreadAttribute | AST.Directive | null}
+ */
+function read_attribute(parser) {
+	const start = parser.index;
+
+	if (parser.eat('{')) {
+		parser.allow_whitespace();
+
+		if (parser.eat('...')) {
+			const expression = read_expression(parser);
+
+			parser.allow_whitespace();
+			parser.eat('}', true);
+
+			/** @type {AST.SpreadAttribute} */
+			const spread = {
+				type: 'SpreadAttribute',
+				start,
+				end: parser.index,
+				expression,
+				metadata: {
+					expression: create_expression_metadata()
+				}
+			};
+
+			return spread;
+		} else {
+			const value_start = parser.index;
+			let name = parser.read_identifier();
+
+			if (name === null) {
+				if (
+					parser.loose &&
+					(parser.match('#') || parser.match('/') || parser.match('@') || parser.match(':'))
+				) {
+					// We're likely in an unclosed opening tag and did read part of a block.
+					// Return null to not crash the parser so it can continue with closing the tag.
+					return null;
+				} else if (parser.loose && parser.match('}')) {
+					// Likely in the middle of typing, just created the shorthand
+					name = '';
+				} else {
+					e.attribute_empty_shorthand(start);
+				}
+			}
+
+			parser.allow_whitespace();
+			parser.eat('}', true);
+
+			/** @type {AST.ExpressionTag} */
+			const expression = {
+				type: 'ExpressionTag',
+				start: value_start,
+				end: value_start + name.length,
+				expression: {
+					start: value_start,
+					end: value_start + name.length,
+					type: 'Identifier',
+					name
+				},
+				metadata: {
+					expression: create_expression_metadata()
+				}
+			};
+
+			return create_attribute(name, start, parser.index, expression);
+		}
+	}
+
+	const name = parser.read_until(regex_token_ending_character);
+	if (!name) return null;
+
+	let end = parser.index;
+
+	parser.allow_whitespace();
+
+	const colon_index = name.indexOf(':');
+	const type = colon_index !== -1 && get_directive_type(name.slice(0, colon_index));
+
+	/** @type {true | AST.ExpressionTag | Array<AST.Text | AST.ExpressionTag>} */
+	let value = true;
+	if (parser.eat('=')) {
+		parser.allow_whitespace();
+
+		if (parser.template[parser.index] === '/' && parser.template[parser.index + 1] === '>') {
+			const char_start = parser.index;
+			parser.index++; // consume '/'
+			value = [
+				{
+					start: char_start,
+					end: char_start + 1,
+					type: 'Text',
+					raw: '/',
+					data: '/'
+				}
+			];
+			end = parser.index;
+		} else {
+			value = read_attribute_value(parser);
+			end = parser.index;
+		}
+	} else if (parser.match_regex(regex_starts_with_quote_characters)) {
+		e.expected_token(parser.index, '=');
+	}
+
+	if (type) {
+		const [directive_name, ...modifiers] = name.slice(colon_index + 1).split('|');
+
+		if (directive_name === '') {
+			e.directive_missing_name({ start, end: start + colon_index + 1 }, name);
+		}
+
+		if (type === 'StyleDirective') {
+			return {
+				start,
+				end,
+				type,
+				name: directive_name,
+				modifiers: /** @type {Array<'important'>} */ (modifiers),
+				value,
+				metadata: {
+					expression: create_expression_metadata()
+				}
+			};
+		}
+
+		const first_value = value === true ? undefined : Array.isArray(value) ? value[0] : value;
+
+		/** @type {Expression | null} */
+		let expression = null;
+
+		if (first_value) {
+			const attribute_contains_text =
+				/** @type {any[]} */ (value).length > 1 || first_value.type === 'Text';
+			if (attribute_contains_text) {
+				e.directive_invalid_value(/** @type {number} */ (first_value.start));
+			} else {
+				// TODO throw a parser error in a future version here if this `[ExpressionTag]` instead of `ExpressionTag`,
+				// which means stringified value, which isn't allowed for some directives?
+				expression = first_value.expression;
+			}
+		}
+
+		/** @type {AST.Directive} */
+		const directive = {
+			start,
+			end,
+			type,
+			name: directive_name,
+			expression,
+			metadata: {
+				expression: create_expression_metadata()
+			}
+		};
+
+		// @ts-expect-error we do this separately from the declaration to avoid upsetting typescript
+		directive.modifiers = modifiers;
+
+		if (directive.type === 'TransitionDirective') {
+			const direction = name.slice(0, colon_index);
+			directive.intro = direction === 'in' || direction === 'transition';
+			directive.outro = direction === 'out' || direction === 'transition';
+		}
+
+		// Directive name is expression, e.g. <p class:isRed />
+		if (
+			(directive.type === 'BindDirective' || directive.type === 'ClassDirective') &&
+			!directive.expression
+		) {
+			directive.expression = /** @type {any} */ ({
+				start: start + colon_index + 1,
+				end,
+				type: 'Identifier',
+				name: directive.name
+			});
+		}
+
+		return directive;
+	}
+
+	return create_attribute(name, start, end, value);
+}
+
+/**
+ * @param {string} name
+ * @returns {any}
+ */
+function get_directive_type(name) {
+	if (name === 'use') return 'UseDirective';
+	if (name === 'animate') return 'AnimateDirective';
+	if (name === 'bind') return 'BindDirective';
+	if (name === 'class') return 'ClassDirective';
+	if (name === 'style') return 'StyleDirective';
+	if (name === 'on') return 'OnDirective';
+	if (name === 'let') return 'LetDirective';
+	if (name === 'in' || name === 'out' || name === 'transition') return 'TransitionDirective';
+	return false;
+}
+
+/**
+ * @param {Parser} parser
+ * @return {AST.ExpressionTag | Array<AST.ExpressionTag | AST.Text>}
+ */
+function read_attribute_value(parser) {
+	const quote_mark = parser.eat("'") ? "'" : parser.eat('"') ? '"' : null;
+	if (quote_mark && parser.eat(quote_mark)) {
+		return [
+			{
+				start: parser.index - 1,
+				end: parser.index - 1,
+				type: 'Text',
+				raw: '',
+				data: ''
+			}
+		];
+	}
+
+	/** @type {Array<AST.ExpressionTag | AST.Text>} */
+	let value;
+	try {
+		value = read_sequence(
+			parser,
+			() => {
+				// handle common case of quote marks existing outside of regex for performance reasons
+				if (quote_mark) return parser.match(quote_mark);
+				return !!parser.match_regex(regex_invalid_unquoted_attribute_value);
+			},
+			'in attribute value'
+		);
+	} catch (/** @type {any} */ error) {
+		if (error.code === 'js_parse_error') {
+			// if the attribute value didn't close + self-closing tag
+			// eg: `<Component test={{a:1} />`
+			// acorn may throw a `Unterminated regular expression` because of `/>`
+			const pos = error.position?.[0];
+			if (pos !== undefined && parser.template.slice(pos - 1, pos + 1) === '/>') {
+				parser.index = pos;
+				e.expected_token(pos, quote_mark || '}');
+			}
+		}
+		throw error;
+	}
+
+	if (value.length === 0 && !quote_mark) {
+		e.expected_attribute_value(parser.index);
+	}
+
+	if (quote_mark) parser.index += 1;
+
+	if (quote_mark || value.length > 1 || value[0].type === 'Text') {
+		return value;
+	} else {
+		return value[0];
+	}
+}
+
+/**
+ * @param {Parser} parser
+ * @param {() => boolean} done
+ * @param {string} location
+ * @returns {any[]}
+ */
+function read_sequence(parser, done, location) {
+	/** @type {AST.Text} */
+	let current_chunk = {
+		start: parser.index,
+		end: -1,
+		type: 'Text',
+		raw: '',
+		data: ''
+	};
+
+	/** @type {Array<AST.Text | AST.ExpressionTag>} */
+	const chunks = [];
+
+	/** @param {number} end */
+	function flush(end) {
+		if (current_chunk.raw) {
+			current_chunk.data = decode_character_references(current_chunk.raw, true);
+			current_chunk.end = end;
+			chunks.push(current_chunk);
+		}
+	}
+
+	while (parser.index < parser.template.length) {
+		const index = parser.index;
+
+		if (done()) {
+			flush(parser.index);
+			return chunks;
+		} else if (parser.eat('{')) {
+			if (parser.match('#')) {
+				const index = parser.index - 1;
+				parser.eat('#');
+				const name = parser.read_until(/[^a-z]/);
+				e.block_invalid_placement(index, name, location);
+			} else if (parser.match('@')) {
+				const index = parser.index - 1;
+				parser.eat('@');
+				const name = parser.read_until(/[^a-z]/);
+				e.tag_invalid_placement(index, name, location);
+			}
+
+			flush(parser.index - 1);
+
+			parser.allow_whitespace();
+			const expression = read_expression(parser);
+			parser.allow_whitespace();
+			parser.eat('}', true);
+
+			/** @type {AST.ExpressionTag} */
+			const chunk = {
+				type: 'ExpressionTag',
+				start: index,
+				end: parser.index,
+				expression,
+				metadata: {
+					expression: create_expression_metadata()
+				}
+			};
+
+			chunks.push(chunk);
+
+			current_chunk = {
+				start: parser.index,
+				end: -1,
+				type: 'Text',
+				raw: '',
+				data: ''
+			};
+		} else {
+			current_chunk.raw += parser.template[parser.index++];
+		}
+	}
+
+	if (parser.loose) {
+		return chunks;
+	} else {
+		e.unexpected_eof(parser.template.length);
+	}
+}

node_modules/svelte/src/compiler/phases/1-parse/state/fragment.js

@@ -0,0 +1,17 @@
+/** @import { Parser } from '../index.js' */
+import element from './element.js';
+import tag from './tag.js';
+import text from './text.js';
+
+/** @param {Parser} parser */
+export default function fragment(parser) {
+	if (parser.match('<')) {
+		return element;
+	}
+
+	if (parser.match('{')) {
+		return tag;
+	}
+
+	return text;
+}

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

@@ -0,0 +1,715 @@
+/** @import { ArrowFunctionExpression, Expression, Identifier, Pattern } from 'estree' */
+/** @import { AST } from '#compiler' */
+/** @import { Parser } from '../index.js' */
+import { walk } from 'zimmerframe';
+import * as e from '../../../errors.js';
+import { create_expression_metadata } from '../../nodes.js';
+import { parse_expression_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';
+
+const regex_whitespace_with_closing_curly_brace = /^\s*}/;
+
+/** @param {Parser} parser */
+export default function tag(parser) {
+	const start = parser.index;
+	parser.index += 1;
+
+	parser.allow_whitespace();
+
+	if (parser.eat('#')) return open(parser);
+	if (parser.eat(':')) return next(parser);
+	if (parser.eat('@')) return special(parser);
+	if (parser.match('/')) {
+		if (!parser.match('/*') && !parser.match('//')) {
+			parser.eat('/');
+			return close(parser);
+		}
+	}
+
+	const expression = read_expression(parser);
+
+	parser.allow_whitespace();
+	parser.eat('}', true);
+
+	parser.append({
+		type: 'ExpressionTag',
+		start,
+		end: parser.index,
+		expression,
+		metadata: {
+			expression: create_expression_metadata()
+		}
+	});
+}
+
+/** @param {Parser} parser */
+function open(parser) {
+	let start = parser.index - 2;
+	while (parser.template[start] !== '{') start -= 1;
+
+	if (parser.eat('if')) {
+		parser.require_whitespace();
+
+		/** @type {AST.IfBlock} */
+		const block = parser.append({
+			type: 'IfBlock',
+			elseif: false,
+			start,
+			end: -1,
+			test: read_expression(parser),
+			consequent: create_fragment(),
+			alternate: null
+		});
+
+		parser.allow_whitespace();
+		parser.eat('}', true);
+
+		parser.stack.push(block);
+		parser.fragments.push(block.consequent);
+
+		return;
+	}
+
+	if (parser.eat('each')) {
+		parser.require_whitespace();
+
+		const template = parser.template;
+		let end = parser.template.length;
+
+		/** @type {Expression | undefined} */
+		let expression;
+
+		// we have to do this loop because `{#each x as { y = z }}` fails to parse —
+		// the `as { y = z }` is treated as an Expression but it's actually a Pattern.
+		// the 'fix' is to backtrack and hide everything from the `as` onwards, until
+		// we get a valid expression
+		while (!expression) {
+			try {
+				expression = read_expression(parser, undefined, true);
+			} catch (err) {
+				end = /** @type {any} */ (err).position[0] - 2;
+
+				while (end > start && parser.template.slice(end, end + 2) !== 'as') {
+					end -= 1;
+				}
+
+				if (end <= start) {
+					if (parser.loose) {
+						expression = get_loose_identifier(parser);
+						if (expression) {
+							break;
+						}
+					}
+					throw err;
+				}
+
+				// @ts-expect-error parser.template is meant to be readonly, this is a special case
+				parser.template = template.slice(0, end);
+			}
+		}
+
+		// @ts-expect-error
+		parser.template = template;
+
+		parser.allow_whitespace();
+
+		// {#each} blocks must declare a context – {#each list as item}
+		if (!parser.match('as')) {
+			// this could be a TypeScript assertion that was erroneously eaten.
+
+			if (expression.type === 'SequenceExpression') {
+				expression = expression.expressions[0];
+			}
+
+			let assertion = null;
+			let end = expression.end;
+
+			expression = walk(expression, null, {
+				// @ts-expect-error
+				TSAsExpression(node, context) {
+					if (node.end === /** @type {Expression} */ (expression).end) {
+						assertion = node;
+						end = node.expression.end;
+						return node.expression;
+					}
+
+					context.next();
+				}
+			});
+
+			expression.end = end;
+
+			if (assertion) {
+				// we can't reset `parser.index` to `expression.expression.end` because
+				// it will ignore any parentheses — we need to jump through this hoop
+				let end = /** @type {any} */ (/** @type {any} */ (assertion).typeAnnotation).start - 2;
+				while (parser.template.slice(end, end + 2) !== 'as') end -= 1;
+
+				parser.index = end;
+			}
+		}
+
+		/** @type {Pattern | null} */
+		let context = null;
+		let index;
+		let key;
+
+		if (parser.eat('as')) {
+			parser.require_whitespace();
+
+			context = read_pattern(parser);
+		} else {
+			// {#each Array.from({ length: 10 }), i} is read as a sequence expression,
+			// which is set back above - we now gotta reset the index as a consequence
+			// to properly read the , i part
+			parser.index = /** @type {number} */ (expression.end);
+		}
+
+		parser.allow_whitespace();
+
+		if (parser.eat(',')) {
+			parser.allow_whitespace();
+			index = parser.read_identifier();
+			if (!index) {
+				e.expected_identifier(parser.index);
+			}
+
+			parser.allow_whitespace();
+		}
+
+		if (parser.eat('(')) {
+			parser.allow_whitespace();
+
+			key = read_expression(parser, '(');
+			parser.allow_whitespace();
+			parser.eat(')', true);
+			parser.allow_whitespace();
+		}
+
+		const matches = parser.eat('}', true, false);
+
+		if (!matches) {
+			// Parser may have read the `as` as part of the expression (e.g. in `{#each foo. as x}`)
+			if (parser.template.slice(parser.index - 4, parser.index) === ' as ') {
+				const prev_index = parser.index;
+				context = read_pattern(parser);
+				parser.eat('}', true);
+				expression = {
+					type: 'Identifier',
+					name: '',
+					start: expression.start,
+					end: prev_index - 4
+				};
+			} else {
+				parser.eat('}', true); // rerun to produce the parser error
+			}
+		}
+
+		/** @type {AST.EachBlock} */
+		const block = parser.append({
+			type: 'EachBlock',
+			start,
+			end: -1,
+			expression,
+			body: create_fragment(),
+			context,
+			index,
+			key,
+			metadata: /** @type {any} */ (null) // filled in later
+		});
+
+		parser.stack.push(block);
+		parser.fragments.push(block.body);
+
+		return;
+	}
+
+	if (parser.eat('await')) {
+		parser.require_whitespace();
+		const expression = read_expression(parser);
+		parser.allow_whitespace();
+
+		/** @type {AST.AwaitBlock} */
+		const block = parser.append({
+			type: 'AwaitBlock',
+			start,
+			end: -1,
+			expression,
+			value: null,
+			error: null,
+			pending: null,
+			then: null,
+			catch: null
+		});
+
+		if (parser.eat('then')) {
+			if (parser.match_regex(regex_whitespace_with_closing_curly_brace)) {
+				parser.allow_whitespace();
+			} else {
+				parser.require_whitespace();
+				block.value = read_pattern(parser);
+				parser.allow_whitespace();
+			}
+
+			block.then = create_fragment();
+			parser.fragments.push(block.then);
+		} else if (parser.eat('catch')) {
+			if (parser.match_regex(regex_whitespace_with_closing_curly_brace)) {
+				parser.allow_whitespace();
+			} else {
+				parser.require_whitespace();
+				block.error = read_pattern(parser);
+				parser.allow_whitespace();
+			}
+
+			block.catch = create_fragment();
+			parser.fragments.push(block.catch);
+		} else {
+			block.pending = create_fragment();
+			parser.fragments.push(block.pending);
+		}
+
+		const matches = parser.eat('}', true, false);
+
+		// Parser may have read the `then/catch` as part of the expression (e.g. in `{#await foo. then x}`)
+		if (!matches) {
+			if (parser.template.slice(parser.index - 6, parser.index) === ' then ') {
+				const prev_index = parser.index;
+				block.value = read_pattern(parser);
+				parser.eat('}', true);
+				block.expression = {
+					type: 'Identifier',
+					name: '',
+					start: expression.start,
+					end: prev_index - 6
+				};
+				block.then = block.pending;
+				block.pending = null;
+			} else if (parser.template.slice(parser.index - 7, parser.index) === ' catch ') {
+				const prev_index = parser.index;
+				block.error = read_pattern(parser);
+				parser.eat('}', true);
+				block.expression = {
+					type: 'Identifier',
+					name: '',
+					start: expression.start,
+					end: prev_index - 7
+				};
+				block.catch = block.pending;
+				block.pending = null;
+			} else {
+				parser.eat('}', true); // rerun to produce the parser error
+			}
+		}
+
+		parser.stack.push(block);
+
+		return;
+	}
+
+	if (parser.eat('key')) {
+		parser.require_whitespace();
+
+		const expression = read_expression(parser);
+		parser.allow_whitespace();
+
+		parser.eat('}', true);
+
+		/** @type {AST.KeyBlock} */
+		const block = parser.append({
+			type: 'KeyBlock',
+			start,
+			end: -1,
+			expression,
+			fragment: create_fragment()
+		});
+
+		parser.stack.push(block);
+		parser.fragments.push(block.fragment);
+
+		return;
+	}
+
+	if (parser.eat('snippet')) {
+		parser.require_whitespace();
+
+		const name_start = parser.index;
+		let name = parser.read_identifier();
+		const name_end = parser.index;
+
+		if (name === null) {
+			if (parser.loose) {
+				name = '';
+			} else {
+				e.expected_identifier(parser.index);
+			}
+		}
+
+		parser.allow_whitespace();
+
+		const params_start = parser.index;
+
+		const matched = parser.eat('(', true, false);
+
+		if (matched) {
+			let parentheses = 1;
+
+			while (parser.index < parser.template.length && (!parser.match(')') || parentheses !== 1)) {
+				if (parser.match('(')) parentheses++;
+				if (parser.match(')')) parentheses--;
+				parser.index += 1;
+			}
+
+			parser.eat(')', true);
+		}
+
+		const prelude = parser.template.slice(0, params_start).replace(/\S/g, ' ');
+		const params = parser.template.slice(params_start, parser.index);
+
+		let function_expression = matched
+			? /** @type {ArrowFunctionExpression} */ (
+					parse_expression_at(prelude + `${params} => {}`, parser.ts, params_start)
+				)
+			: { params: [] };
+
+		parser.allow_whitespace();
+		parser.eat('}', true);
+
+		/** @type {AST.SnippetBlock} */
+		const block = parser.append({
+			type: 'SnippetBlock',
+			start,
+			end: -1,
+			expression: {
+				type: 'Identifier',
+				start: name_start,
+				end: name_end,
+				name
+			},
+			parameters: function_expression.params,
+			body: create_fragment(),
+			metadata: {
+				can_hoist: false,
+				sites: new Set()
+			}
+		});
+		parser.stack.push(block);
+		parser.fragments.push(block.body);
+
+		return;
+	}
+
+	e.expected_block_type(parser.index);
+}
+
+/** @param {Parser} parser */
+function next(parser) {
+	const start = parser.index - 1;
+
+	const block = parser.current(); // TODO type should not be TemplateNode, that's much too broad
+
+	if (block.type === 'IfBlock') {
+		if (!parser.eat('else')) e.expected_token(start, '{:else} or {:else if}');
+		if (parser.eat('if')) e.block_invalid_elseif(start);
+
+		parser.allow_whitespace();
+
+		parser.fragments.pop();
+
+		block.alternate = create_fragment();
+		parser.fragments.push(block.alternate);
+
+		// :else if
+		if (parser.eat('if')) {
+			parser.require_whitespace();
+
+			const expression = read_expression(parser);
+
+			parser.allow_whitespace();
+			parser.eat('}', true);
+
+			let elseif_start = start - 1;
+			while (parser.template[elseif_start] !== '{') elseif_start -= 1;
+
+			/** @type {AST.IfBlock} */
+			const child = parser.append({
+				start: elseif_start,
+				end: -1,
+				type: 'IfBlock',
+				elseif: true,
+				test: expression,
+				consequent: create_fragment(),
+				alternate: null
+			});
+
+			parser.stack.push(child);
+			parser.fragments.pop();
+			parser.fragments.push(child.consequent);
+		} else {
+			// :else
+			parser.allow_whitespace();
+			parser.eat('}', true);
+		}
+
+		return;
+	}
+
+	if (block.type === 'EachBlock') {
+		if (!parser.eat('else')) e.expected_token(start, '{:else}');
+
+		parser.allow_whitespace();
+		parser.eat('}', true);
+
+		block.fallback = create_fragment();
+
+		parser.fragments.pop();
+		parser.fragments.push(block.fallback);
+
+		return;
+	}
+
+	if (block.type === 'AwaitBlock') {
+		if (parser.eat('then')) {
+			if (block.then) {
+				e.block_duplicate_clause(start, '{:then}');
+			}
+
+			if (!parser.eat('}')) {
+				parser.require_whitespace();
+				block.value = read_pattern(parser);
+				parser.allow_whitespace();
+				parser.eat('}', true);
+			}
+
+			block.then = create_fragment();
+			parser.fragments.pop();
+			parser.fragments.push(block.then);
+
+			return;
+		}
+
+		if (parser.eat('catch')) {
+			if (block.catch) {
+				e.block_duplicate_clause(start, '{:catch}');
+			}
+
+			if (!parser.eat('}')) {
+				parser.require_whitespace();
+				block.error = read_pattern(parser);
+				parser.allow_whitespace();
+				parser.eat('}', true);
+			}
+
+			block.catch = create_fragment();
+			parser.fragments.pop();
+			parser.fragments.push(block.catch);
+
+			return;
+		}
+
+		e.expected_token(start, '{:then ...} or {:catch ...}');
+	}
+
+	e.block_invalid_continuation_placement(start);
+}
+
+/** @param {Parser} parser */
+function close(parser) {
+	const start = parser.index - 1;
+
+	let block = parser.current();
+	/** Only relevant/reached for loose parsing mode */
+	let matched;
+
+	switch (block.type) {
+		case 'IfBlock':
+			matched = parser.eat('if', true, false);
+
+			if (!matched) {
+				block.end = start - 1;
+				parser.pop();
+				close(parser);
+				return;
+			}
+
+			parser.allow_whitespace();
+			parser.eat('}', true);
+
+			while (block.elseif) {
+				block.end = parser.index;
+				parser.stack.pop();
+				block = /** @type {AST.IfBlock} */ (parser.current());
+			}
+
+			block.end = parser.index;
+			parser.pop();
+			return;
+
+		case 'EachBlock':
+			matched = parser.eat('each', true, false);
+			break;
+		case 'KeyBlock':
+			matched = parser.eat('key', true, false);
+			break;
+		case 'AwaitBlock':
+			matched = parser.eat('await', true, false);
+			break;
+		case 'SnippetBlock':
+			matched = parser.eat('snippet', true, false);
+			break;
+
+		case 'RegularElement':
+			if (parser.loose) {
+				matched = false;
+			} else {
+				// TODO handle implicitly closed elements
+				e.block_unexpected_close(start);
+			}
+			break;
+
+		default:
+			e.block_unexpected_close(start);
+	}
+
+	if (!matched) {
+		block.end = start - 1;
+		parser.pop();
+		close(parser);
+		return;
+	}
+
+	parser.allow_whitespace();
+	parser.eat('}', true);
+	block.end = parser.index;
+	parser.pop();
+}
+
+/** @param {Parser} parser */
+function special(parser) {
+	let start = parser.index;
+	while (parser.template[start] !== '{') start -= 1;
+
+	if (parser.eat('html')) {
+		// {@html content} tag
+		parser.require_whitespace();
+
+		const expression = read_expression(parser);
+
+		parser.allow_whitespace();
+		parser.eat('}', true);
+
+		parser.append({
+			type: 'HtmlTag',
+			start,
+			end: parser.index,
+			expression
+		});
+
+		return;
+	}
+
+	if (parser.eat('debug')) {
+		/** @type {Identifier[]} */
+		let identifiers;
+
+		// Implies {@debug} which indicates "debug all"
+		if (parser.read(regex_whitespace_with_closing_curly_brace)) {
+			identifiers = [];
+		} else {
+			const expression = read_expression(parser);
+
+			identifiers =
+				expression.type === 'SequenceExpression'
+					? /** @type {Identifier[]} */ (expression.expressions)
+					: [/** @type {Identifier} */ (expression)];
+
+			identifiers.forEach(
+				/** @param {any} node */ (node) => {
+					if (node.type !== 'Identifier') {
+						e.debug_tag_invalid_arguments(/** @type {number} */ (node.start));
+					}
+				}
+			);
+
+			parser.allow_whitespace();
+			parser.eat('}', true);
+		}
+
+		parser.append({
+			type: 'DebugTag',
+			start,
+			end: parser.index,
+			identifiers
+		});
+
+		return;
+	}
+
+	if (parser.eat('const')) {
+		parser.require_whitespace();
+
+		const id = read_pattern(parser);
+		parser.allow_whitespace();
+
+		parser.eat('=', true);
+		parser.allow_whitespace();
+
+		const expression_start = parser.index;
+		const init = read_expression(parser);
+		if (
+			init.type === 'SequenceExpression' &&
+			!parser.template.substring(expression_start, init.start).includes('(')
+		) {
+			// const a = (b, c) is allowed but a = b, c = d is not;
+			e.const_tag_invalid_expression(init);
+		}
+		parser.allow_whitespace();
+
+		parser.eat('}', true);
+
+		parser.append({
+			type: 'ConstTag',
+			start,
+			end: parser.index,
+			declaration: {
+				type: 'VariableDeclaration',
+				kind: 'const',
+				declarations: [{ type: 'VariableDeclarator', id, init, start: id.start, end: init.end }],
+				start: start + 2, // start at const, not at @const
+				end: parser.index - 1
+			}
+		});
+	}
+
+	if (parser.eat('render')) {
+		// {@render foo(...)}
+		parser.require_whitespace();
+
+		const expression = read_expression(parser);
+
+		if (
+			expression.type !== 'CallExpression' &&
+			(expression.type !== 'ChainExpression' || expression.expression.type !== 'CallExpression')
+		) {
+			e.render_tag_invalid_expression(expression);
+		}
+
+		parser.allow_whitespace();
+		parser.eat('}', true);
+
+		parser.append({
+			type: 'RenderTag',
+			start,
+			end: parser.index,
+			expression: /** @type {AST.RenderTag['expression']} */ (expression),
+			metadata: {
+				dynamic: false,
+				arguments: [],
+				path: [],
+				snippets: new Set()
+			}
+		});
+	}
+}

node_modules/svelte/src/compiler/phases/1-parse/state/text.js

@@ -0,0 +1,23 @@
+/** @import { AST } from '#compiler' */
+/** @import { Parser } from '../index.js' */
+import { decode_character_references } from '../utils/html.js';
+
+/** @param {Parser} parser */
+export default function text(parser) {
+	const start = parser.index;
+
+	let data = '';
+
+	while (parser.index < parser.template.length && !parser.match('<') && !parser.match('{')) {
+		data += parser.template[parser.index++];
+	}
+
+	/** @type {AST.Text} */
+	parser.append({
+		type: 'Text',
+		start,
+		end: parser.index,
+		raw: data,
+		data: decode_character_references(data, false)
+	});
+}

node_modules/svelte/src/compiler/phases/1-parse/utils/bracket.js

@@ -0,0 +1,164 @@
+const SQUARE_BRACKET_OPEN = '[';
+const SQUARE_BRACKET_CLOSE = ']';
+const CURLY_BRACKET_OPEN = '{';
+const CURLY_BRACKET_CLOSE = '}';
+const PARENTHESES_OPEN = '(';
+const PARENTHESES_CLOSE = ')';
+
+/** @param {string} char */
+export function is_bracket_open(char) {
+	return char === SQUARE_BRACKET_OPEN || char === CURLY_BRACKET_OPEN;
+}
+
+/** @param {string} char */
+export function is_bracket_close(char) {
+	return char === SQUARE_BRACKET_CLOSE || char === CURLY_BRACKET_CLOSE;
+}
+
+/** @param {string} open */
+export function get_bracket_close(open) {
+	if (open === SQUARE_BRACKET_OPEN) {
+		return SQUARE_BRACKET_CLOSE;
+	}
+
+	if (open === CURLY_BRACKET_OPEN) {
+		return CURLY_BRACKET_CLOSE;
+	}
+
+	if (open === PARENTHESES_OPEN) {
+		return PARENTHESES_CLOSE;
+	}
+}
+
+/**
+ * @param {number} num
+ * @returns {number} Infinity if {@link num} is negative, else {@link num}.
+ */
+function infinity_if_negative(num) {
+	if (num < 0) {
+		return Infinity;
+	}
+	return num;
+}
+
+/**
+ * @param {string} string The string to search.
+ * @param {number} search_start_index The index to start searching at.
+ * @param {"'" | '"' | '`'} string_start_char The character that started this string.
+ * @returns {number} The index of the end of this string expression, or `Infinity` if not found.
+ */
+function find_string_end(string, search_start_index, string_start_char) {
+	let string_to_search;
+	if (string_start_char === '`') {
+		string_to_search = string;
+	} else {
+		// we could slice at the search start index, but this way the index remains valid
+		string_to_search = string.slice(
+			0,
+			infinity_if_negative(string.indexOf('\n', search_start_index))
+		);
+	}
+
+	return find_unescaped_char(string_to_search, search_start_index, string_start_char);
+}
+
+/**
+ * @param {string} string The string to search.
+ * @param {number} search_start_index The index to start searching at.
+ * @returns {number} The index of the end of this regex expression, or `Infinity` if not found.
+ */
+function find_regex_end(string, search_start_index) {
+	return find_unescaped_char(string, search_start_index, '/');
+}
+
+/**
+ *
+ * @param {string} string The string to search.
+ * @param {number} search_start_index The index to begin the search at.
+ * @param {string} char The character to search for.
+ * @returns {number} The index of the first unescaped instance of {@link char}, or `Infinity` if not found.
+ */
+function find_unescaped_char(string, search_start_index, char) {
+	let i = search_start_index;
+	while (true) {
+		const found_index = string.indexOf(char, i);
+		if (found_index === -1) {
+			return Infinity;
+		}
+		if (count_leading_backslashes(string, found_index - 1) % 2 === 0) {
+			return found_index;
+		}
+		i = found_index + 1;
+	}
+}
+
+/**
+ * Count consecutive leading backslashes before {@link search_start_index}.
+ *
+ * @example
+ * ```js
+ * count_leading_backslashes('\\\\\\foo', 2); // 3 (the backslashes have to be escaped in the string literal, there are three in reality)
+ * ```
+ *
+ * @param {string} string The string to search.
+ * @param {number} search_start_index The index to begin the search at.
+ */
+function count_leading_backslashes(string, search_start_index) {
+	let i = search_start_index;
+	let count = 0;
+	while (string[i] === '\\') {
+		count++;
+		i--;
+	}
+	return count;
+}
+
+/**
+ * Finds the corresponding closing bracket, ignoring brackets found inside comments, strings, or regex expressions.
+ * @param {string} template The string to search.
+ * @param {number} index The index to begin the search at.
+ * @param {string} open The opening bracket (ex: `'{'` will search for `'}'`).
+ * @returns {number | undefined} The index of the closing bracket, or undefined if not found.
+ */
+export function find_matching_bracket(template, index, open) {
+	const close = get_bracket_close(open);
+	let brackets = 1;
+	let i = index;
+	while (brackets > 0 && i < template.length) {
+		const char = template[i];
+		switch (char) {
+			case "'":
+			case '"':
+			case '`':
+				i = find_string_end(template, i + 1, char) + 1;
+				continue;
+			case '/': {
+				const next_char = template[i + 1];
+				if (!next_char) continue;
+				if (next_char === '/') {
+					i = infinity_if_negative(template.indexOf('\n', i + 1)) + '\n'.length;
+					continue;
+				}
+				if (next_char === '*') {
+					i = infinity_if_negative(template.indexOf('*/', i + 1)) + '*/'.length;
+					continue;
+				}
+				i = find_regex_end(template, i + 1) + '/'.length;
+				continue;
+			}
+			default: {
+				const char = template[i];
+				if (char === open) {
+					brackets++;
+				} else if (char === close) {
+					brackets--;
+				}
+				if (brackets === 0) {
+					return i;
+				}
+				i++;
+			}
+		}
+	}
+	return undefined;
+}

node_modules/svelte/src/compiler/phases/1-parse/utils/create.js

@@ -0,0 +1,16 @@
+/** @import { AST } from '#compiler' */
+
+/**
+ * @param {any} transparent
+ * @returns {AST.Fragment}
+ */
+export function create_fragment(transparent = false) {
+	return {
+		type: 'Fragment',
+		nodes: [],
+		metadata: {
+			transparent,
+			dynamic: false
+		}
+	};
+}

node_modules/svelte/src/compiler/phases/1-parse/utils/fuzzymatch.js

@@ -0,0 +1,280 @@
+/**
+ * @param {string} name
+ * @param {string[]} names
+ * @returns {string | null}
+ */
+export default function fuzzymatch(name, names) {
+	if (names.length === 0) return null;
+
+	const set = new FuzzySet(names);
+	const matches = set.get(name);
+
+	return matches && matches[0][0] > 0.7 ? matches[0][1] : null;
+}
+
+// adapted from https://github.com/Glench/fuzzyset.js/blob/master/lib/fuzzyset.js
+// BSD Licensed
+
+const GRAM_SIZE_LOWER = 2;
+const GRAM_SIZE_UPPER = 3;
+
+// return an edit distance from 0 to 1
+
+/**
+ * @param {string} str1
+ * @param {string} str2
+ */
+function _distance(str1, str2) {
+	if (str1 === null && str2 === null) {
+		throw 'Trying to compare two null values';
+	}
+	if (str1 === null || str2 === null) return 0;
+	str1 = String(str1);
+	str2 = String(str2);
+
+	const distance = levenshtein(str1, str2);
+	return 1 - distance / Math.max(str1.length, str2.length);
+}
+
+// helper functions
+
+/**
+ * @param {string} str1
+ * @param {string} str2
+ */
+function levenshtein(str1, str2) {
+	/** @type {number[]} */
+	const current = [];
+	let prev = 0;
+	let value = 0;
+
+	for (let i = 0; i <= str2.length; i++) {
+		for (let j = 0; j <= str1.length; j++) {
+			if (i && j) {
+				if (str1.charAt(j - 1) === str2.charAt(i - 1)) {
+					value = prev;
+				} else {
+					value = Math.min(current[j], current[j - 1], prev) + 1;
+				}
+			} else {
+				value = i + j;
+			}
+
+			prev = current[j];
+			current[j] = value;
+		}
+	}
+
+	return /** @type {number} */ (current.pop());
+}
+
+const non_word_regex = /[^\w, ]+/;
+
+/**
+ * @param {string} value
+ * @param {any} gram_size
+ */
+function iterate_grams(value, gram_size = 2) {
+	const simplified = '-' + value.toLowerCase().replace(non_word_regex, '') + '-';
+	const len_diff = gram_size - simplified.length;
+	const results = [];
+
+	if (len_diff > 0) {
+		for (let i = 0; i < len_diff; ++i) {
+			value += '-';
+		}
+	}
+	for (let i = 0; i < simplified.length - gram_size + 1; ++i) {
+		results.push(simplified.slice(i, i + gram_size));
+	}
+	return results;
+}
+
+/**
+ * @param {string} value
+ * @param {any} gram_size
+ */
+function gram_counter(value, gram_size = 2) {
+	// return an object where key=gram, value=number of occurrences
+
+	/** @type {Record<string, number>} */
+	const result = {};
+	const grams = iterate_grams(value, gram_size);
+	let i = 0;
+
+	for (i; i < grams.length; ++i) {
+		if (grams[i] in result) {
+			result[grams[i]] += 1;
+		} else {
+			result[grams[i]] = 1;
+		}
+	}
+	return result;
+}
+
+/**
+ * @param {MatchTuple} a
+ * @param {MatchTuple} b
+ */
+function sort_descending(a, b) {
+	return b[0] - a[0];
+}
+
+class FuzzySet {
+	/** @type {Record<string, string>} */
+	exact_set = {};
+
+	/** @type {Record<string, [number, number][]>} */
+	match_dict = {};
+
+	/** @type {Record<string, number[]>} */
+	items = {};
+
+	/** @param {string[]} arr */
+	constructor(arr) {
+		// initialisation
+		for (let i = GRAM_SIZE_LOWER; i < GRAM_SIZE_UPPER + 1; ++i) {
+			this.items[i] = [];
+		}
+
+		// add all the items to the set
+		for (let i = 0; i < arr.length; ++i) {
+			this.add(arr[i]);
+		}
+	}
+
+	/** @param {string} value */
+	add(value) {
+		const normalized_value = value.toLowerCase();
+		if (normalized_value in this.exact_set) {
+			return false;
+		}
+
+		let i = GRAM_SIZE_LOWER;
+		for (i; i < GRAM_SIZE_UPPER + 1; ++i) {
+			this._add(value, i);
+		}
+	}
+
+	/**
+	 * @param {string} value
+	 * @param {number} gram_size
+	 */
+	_add(value, gram_size) {
+		const normalized_value = value.toLowerCase();
+		const items = this.items[gram_size] || [];
+		const index = items.length;
+
+		items.push(0);
+		const gram_counts = gram_counter(normalized_value, gram_size);
+		let sum_of_square_gram_counts = 0;
+		let gram;
+		let gram_count;
+
+		for (gram in gram_counts) {
+			gram_count = gram_counts[gram];
+			sum_of_square_gram_counts += Math.pow(gram_count, 2);
+			if (gram in this.match_dict) {
+				this.match_dict[gram].push([index, gram_count]);
+			} else {
+				this.match_dict[gram] = [[index, gram_count]];
+			}
+		}
+		const vector_normal = Math.sqrt(sum_of_square_gram_counts);
+		// @ts-ignore no idea what this code is doing
+		items[index] = [vector_normal, normalized_value];
+		this.items[gram_size] = items;
+		this.exact_set[normalized_value] = value;
+	}
+
+	/** @param {string} value */
+	get(value) {
+		const normalized_value = value.toLowerCase();
+		const result = this.exact_set[normalized_value];
+
+		if (result) {
+			return /** @type {MatchTuple[]} */ ([[1, result]]);
+		}
+
+		// start with high gram size and if there are no results, go to lower gram sizes
+		for (let gram_size = GRAM_SIZE_UPPER; gram_size >= GRAM_SIZE_LOWER; --gram_size) {
+			const results = this.__get(value, gram_size);
+			if (results.length > 0) return results;
+		}
+		return null;
+	}
+
+	/**
+	 * @param {string} value
+	 * @param {number} gram_size
+	 * @returns {MatchTuple[]}
+	 */
+	__get(value, gram_size) {
+		const normalized_value = value.toLowerCase();
+
+		/** @type {Record<string, number>} */
+		const matches = {};
+		const gram_counts = gram_counter(normalized_value, gram_size);
+		const items = this.items[gram_size];
+		let sum_of_square_gram_counts = 0;
+		let gram;
+		let gram_count;
+		let i;
+		let index;
+		let other_gram_count;
+
+		for (gram in gram_counts) {
+			gram_count = gram_counts[gram];
+			sum_of_square_gram_counts += Math.pow(gram_count, 2);
+			if (gram in this.match_dict) {
+				for (i = 0; i < this.match_dict[gram].length; ++i) {
+					index = this.match_dict[gram][i][0];
+					other_gram_count = this.match_dict[gram][i][1];
+					if (index in matches) {
+						matches[index] += gram_count * other_gram_count;
+					} else {
+						matches[index] = gram_count * other_gram_count;
+					}
+				}
+			}
+		}
+
+		const vector_normal = Math.sqrt(sum_of_square_gram_counts);
+
+		/** @type {MatchTuple[]} */
+		let results = [];
+		let match_score;
+
+		// build a results list of [score, str]
+		for (const match_index in matches) {
+			match_score = matches[match_index];
+			// @ts-ignore no idea what this code is doing
+			results.push([match_score / (vector_normal * items[match_index][0]), items[match_index][1]]);
+		}
+
+		results.sort(sort_descending);
+
+		/** @type {MatchTuple[]} */
+		let new_results = [];
+		const end_index = Math.min(50, results.length);
+		// truncate somewhat arbitrarily to 50
+		for (let i = 0; i < end_index; ++i) {
+			// @ts-ignore no idea what this code is doing
+			new_results.push([_distance(results[i][1], normalized_value), results[i][1]]);
+		}
+		results = new_results;
+		results.sort(sort_descending);
+
+		new_results = [];
+		for (let i = 0; i < results.length; ++i) {
+			if (results[i][0] === results[0][0]) {
+				// @ts-ignore no idea what this code is doing
+				new_results.push([results[i][0], this.exact_set[results[i][1]]]);
+			}
+		}
+
+		return new_results;
+	}
+}
+
+/** @typedef {[score: number, match: string]} MatchTuple */

node_modules/svelte/src/compiler/phases/1-parse/utils/html.js

@@ -0,0 +1,120 @@
+import entities from './entities.js';
+
+const windows_1252 = [
+	8364, 129, 8218, 402, 8222, 8230, 8224, 8225, 710, 8240, 352, 8249, 338, 141, 381, 143, 144, 8216,
+	8217, 8220, 8221, 8226, 8211, 8212, 732, 8482, 353, 8250, 339, 157, 382, 376
+];
+
+/**
+ * @param {string} entity_name
+ * @param {boolean} is_attribute_value
+ */
+function reg_exp_entity(entity_name, is_attribute_value) {
+	// https://html.spec.whatwg.org/multipage/parsing.html#named-character-reference-state
+	// doesn't decode the html entity which not ends with ; and next character is =, number or alphabet in attribute value.
+	if (is_attribute_value && !entity_name.endsWith(';')) {
+		return `${entity_name}\\b(?!=)`;
+	}
+	return entity_name;
+}
+
+/** @param {boolean} is_attribute_value */
+function get_entity_pattern(is_attribute_value) {
+	const reg_exp_num = '#(?:x[a-fA-F\\d]+|\\d+)(?:;)?';
+	const reg_exp_entities = Object.keys(entities).map(
+		/** @param {any} entity_name */ (entity_name) => reg_exp_entity(entity_name, is_attribute_value)
+	);
+
+	const entity_pattern = new RegExp(`&(${reg_exp_num}|${reg_exp_entities.join('|')})`, 'g');
+
+	return entity_pattern;
+}
+
+const entity_pattern_content = get_entity_pattern(false);
+const entity_pattern_attr_value = get_entity_pattern(true);
+
+/**
+ * @param {string} html
+ * @param {boolean} is_attribute_value
+ */
+export function decode_character_references(html, is_attribute_value) {
+	const entity_pattern = is_attribute_value ? entity_pattern_attr_value : entity_pattern_content;
+	return html.replace(
+		entity_pattern,
+		/**
+		 * @param {any} match
+		 * @param {keyof typeof entities} entity
+		 */ (match, entity) => {
+			let code;
+
+			// Handle named entities
+			if (entity[0] !== '#') {
+				code = entities[entity];
+			} else if (entity[1] === 'x') {
+				code = parseInt(entity.substring(2), 16);
+			} else {
+				code = parseInt(entity.substring(1), 10);
+			}
+
+			if (!code) {
+				return match;
+			}
+
+			return String.fromCodePoint(validate_code(code));
+		}
+	);
+}
+
+const NUL = 0;
+
+// some code points are verboten. If we were inserting HTML, the browser would replace the illegal
+// code points with alternatives in some cases - since we're bypassing that mechanism, we need
+// to replace them ourselves
+//
+// Source: http://en.wikipedia.org/wiki/Character_encodings_in_HTML#Illegal_characters
+
+/** @param {number} code */
+function validate_code(code) {
+	// line feed becomes generic whitespace
+	if (code === 10) {
+		return 32;
+	}
+
+	// ASCII range. (Why someone would use HTML entities for ASCII characters I don't know, but...)
+	if (code < 128) {
+		return code;
+	}
+
+	// code points 128-159 are dealt with leniently by browsers, but they're incorrect. We need
+	// to correct the mistake or we'll end up with missing € signs and so on
+	if (code <= 159) {
+		return windows_1252[code - 128];
+	}
+
+	// basic multilingual plane
+	if (code < 55296) {
+		return code;
+	}
+
+	// UTF-16 surrogate halves
+	if (code <= 57343) {
+		return NUL;
+	}
+
+	// rest of the basic multilingual plane
+	if (code <= 65535) {
+		return code;
+	}
+
+	// supplementary multilingual plane 0x10000 - 0x1ffff
+	if (code >= 65536 && code <= 131071) {
+		return code;
+	}
+
+	// supplementary ideographic plane 0x20000 - 0x2ffff
+	if (code >= 131072 && code <= 196607) {
+		return code;
+	}
+
+	return NUL;
+}