From 587ad7b17beba50279eaf46b06c5bf5559c4f36e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=83=81=E8=92=B8=E5=8D=81=E5=9B=9B?=
 <55919198+yuzheng14@users.noreply.github.com>
Date: Tue, 10 Sep 2024 22:47:36 +0800
Subject: [PATCH] fix(build): declare `preload-helper` has no side effects
 (#18057)

---
 packages/vite/src/node/plugins/importAnalysisBuild.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/vite/src/node/plugins/importAnalysisBuild.ts b/packages/vite/src/node/plugins/importAnalysisBuild.ts
index 3392847a5ee613..12d35997c92271 100644
--- a/packages/vite/src/node/plugins/importAnalysisBuild.ts
+++ b/packages/vite/src/node/plugins/importAnalysisBuild.ts
@@ -188,7 +188,7 @@ export function buildImportAnalysisPlugin(config: ResolvedConfig): Plugin {
         const scriptRel =
           modulePreload && modulePreload.polyfill
             ? `'modulepreload'`
-            : `(${detectScriptRel.toString()})()`
+            : `/* @__PURE__ */ (${detectScriptRel.toString()})()`
 
         // There are two different cases for the preload list format in __vitePreload
         //
@@ -207,7 +207,7 @@ export function buildImportAnalysisPlugin(config: ResolvedConfig): Plugin {
               // is appended inside __vitePreload too.
               `function(dep) { return ${JSON.stringify(config.base)}+dep }`
         const preloadCode = `const scriptRel = ${scriptRel};const assetsURL = ${assetsURL};const seen = {};export const ${preloadMethod} = ${preload.toString()}`
-        return preloadCode
+        return { code: preloadCode, moduleSideEffects: false }
       }
     },