fix: keep comments in `<script module>` from applying to the instance script

.changeset/module-script-comments.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: keep comments in `<script module>` from applying to the instance script

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

@@ -22,13 +22,15 @@ const TSParser = JSParser.extend(tsPlugin());
  * @param {AST.JSComment[]} comments
  * @param {boolean} typescript
  * @param {boolean} [is_script]
+ * @param {number} [index] where the script starts: the comments before it are not its own
  */
-export function parse(source, comments, typescript, is_script) {
+export function parse(source, comments, typescript, is_script, index = 0) {
 	const acorn = typescript ? TSParser : JSParser;
 
 	const { onComment, add_comments } = get_comment_handlers(
 		source,
-		/** @type {CommentWithLocation[]} */ (comments)
+		/** @type {CommentWithLocation[]} */ (comments),
+		index
 	);
 
 	// @ts-expect-error

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

@@ -31,7 +31,7 @@ export function read_script(parser, start, attributes) {
 		parser.template.slice(0, script_start).replace(regex_not_newline_characters, ' ') + data;
 	parser.read(regex_starts_with_closing_script_tag);
 
-	const ast = acorn.parse(source, parser.root.comments, parser.ts, true);
+	const ast = acorn.parse(source, parser.root.comments, parser.ts, true, script_start);
 
 	ast.start = script_start;
 

packages/svelte/tests/validator/samples/svelte-ignore-module-script/input.svelte

@@ -0,0 +1,11 @@
+<script module>
+	// svelte-ignore state_referenced_locally
+	export const answer = 42;
+</script>
+
+<script>
+	let count = $state(0),
+		doubled = count * 2;
+</script>
+
+{doubled}

packages/svelte/tests/validator/samples/svelte-ignore-module-script/warnings.json

@@ -0,0 +1,14 @@
+[
+	{
+		"code": "state_referenced_locally",
+		"message": "This reference only captures the initial value of `count`. Did you mean to reference it inside a closure instead?",
+		"start": {
+			"line": 8,
+			"column": 12
+		},
+		"end": {
+			"line": 8,
+			"column": 17
+		}
+	}
+]