diff --git a/.changeset/red-ladybugs-press.md b/.changeset/red-ladybugs-press.md
new file mode 100644
index 000000000000..463aad1aea24
--- /dev/null
+++ b/.changeset/red-ladybugs-press.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: exclude service worker directory from tsconfig
diff --git a/packages/kit/src/core/sync/write_tsconfig.js b/packages/kit/src/core/sync/write_tsconfig.js
index de7214b98b3e..896ef70b8e76 100644
--- a/packages/kit/src/core/sync/write_tsconfig.js
+++ b/packages/kit/src/core/sync/write_tsconfig.js
@@ -87,8 +87,11 @@ export function get_tsconfig(kit) {
 		exclude.push(config_relative(kit.files.serviceWorker));
 	} else {
 		exclude.push(config_relative(`${kit.files.serviceWorker}.js`));
+		exclude.push(config_relative(`${kit.files.serviceWorker}/**/*.js`));
 		exclude.push(config_relative(`${kit.files.serviceWorker}.ts`));
+		exclude.push(config_relative(`${kit.files.serviceWorker}/**/*.ts`));
 		exclude.push(config_relative(`${kit.files.serviceWorker}.d.ts`));
+		exclude.push(config_relative(`${kit.files.serviceWorker}/**/*.d.ts`));
 	}
 
 	const config = {