From df52a4eed06395b62934933e8ab7d620df957e30 Mon Sep 17 00:00:00 2001
From: Simon H <5968653+dummdidumm@users.noreply.github.com>
Date: Mon, 16 Dec 2024 15:32:04 +0100
Subject: [PATCH] Update packages/kit/src/exports/vite/index.js

---
 packages/kit/src/exports/vite/index.js | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/packages/kit/src/exports/vite/index.js b/packages/kit/src/exports/vite/index.js
index 419e507dd37e..8a52c04d1feb 100644
--- a/packages/kit/src/exports/vite/index.js
+++ b/packages/kit/src/exports/vite/index.js
@@ -817,20 +817,19 @@ async function kit({ svelte_config }) {
 
 				// we do not want to copy the unused server stylesheets generated by
 				// Vite's `build.ssrEmitAssets` option
-				/** @type {string[]} */
-				const ssr_stylesheets = [];
+				/** @type {Set<string>} */
+				const ssr_stylesheets = new Set();
 				for (const key in server_manifest) {
-					const stylesheets = server_manifest[key].css;
-					if (stylesheets) {
-						ssr_stylesheets.push(...stylesheets);
+					const stylesheets = server_manifest[key].css ?? [];
+					for (const stylesheet of stylesheets) {
+						ssr_stylesheets.add(stylesheet);
 					}
 				}
-				const ssr_stylesheets_set = new Set(ssr_stylesheets);
 
 				const assets_path = `${kit.appDir}/immutable/assets`;
 
 				copy(`${out}/server/${assets_path}`, `${out}/client/${assets_path}`, {
-					filter: (basename) => !ssr_stylesheets_set.has(`${assets_path}/${basename}`)
+					filter: (basename) => !ssr_stylesheets.has(`${assets_path}/${basename}`)
 				});
 
 				/** @type {import('vite').Manifest} */