From 23265f1fca610914e940dd10b1e56849b7d7de29 Mon Sep 17 00:00:00 2001
From: Nic <162764842+Nic-Polumeyv@users.noreply.github.com>
Date: Tue, 6 Oct 2026 18:12:41 -0400
Subject: [PATCH] fix: keep comments in `<script module>` from applying to the
 instance script

---
 .changeset/module-script-comments.md               |  5 +++++
 .../svelte/src/compiler/phases/1-parse/acorn.js    |  6 ++++--
 .../src/compiler/phases/1-parse/read/script.js     |  2 +-
 .../svelte-ignore-module-script/input.svelte       | 11 +++++++++++
 .../svelte-ignore-module-script/warnings.json      | 14 ++++++++++++++
 5 files changed, 35 insertions(+), 3 deletions(-)
 create mode 100644 .changeset/module-script-comments.md
 create mode 100644 packages/svelte/tests/validator/samples/svelte-ignore-module-script/input.svelte
 create mode 100644 packages/svelte/tests/validator/samples/svelte-ignore-module-script/warnings.json

diff --git a/.changeset/module-script-comments.md b/.changeset/module-script-comments.md
new file mode 100644
index 0000000000..384130fefc
--- /dev/null
+++ b/.changeset/module-script-comments.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: keep comments in `<script module>` from applying to the instance script
diff --git a/packages/svelte/src/compiler/phases/1-parse/acorn.js b/packages/svelte/src/compiler/phases/1-parse/acorn.js
index add61ea19f..3dcc2295d9 100644
--- a/packages/svelte/src/compiler/phases/1-parse/acorn.js
+++ b/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
diff --git a/packages/svelte/src/compiler/phases/1-parse/read/script.js b/packages/svelte/src/compiler/phases/1-parse/read/script.js
index 48fb540f9c..d120f6a455 100644
--- a/packages/svelte/src/compiler/phases/1-parse/read/script.js
+++ b/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;
 
diff --git a/packages/svelte/tests/validator/samples/svelte-ignore-module-script/input.svelte b/packages/svelte/tests/validator/samples/svelte-ignore-module-script/input.svelte
new file mode 100644
index 0000000000..142ef3d00d
--- /dev/null
+++ b/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}
diff --git a/packages/svelte/tests/validator/samples/svelte-ignore-module-script/warnings.json b/packages/svelte/tests/validator/samples/svelte-ignore-module-script/warnings.json
new file mode 100644
index 0000000000..407361e37d
--- /dev/null
+++ b/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
+		}
+	}
+]