fix: Avoid importing in source that __vitePreload has declared (close v…

…itejs#4016)
xingxiuyi · Jun 30, 2021 · d9bbb6c · d9bbb6c
1 parent da2a41d
commit d9bbb6c
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/packages/vite/src/node/plugins/importAnalysisBuild.ts b/packages/vite/src/node/plugins/importAnalysisBuild.ts
@@ -161,7 +161,11 @@ export function buildImportAnalysisPlugin(config: ResolvedConfig): Plugin {
         }
       }
 
-      if (needPreloadHelper && !ssr) {
+      if (
+        needPreloadHelper &&
+        !ssr &&
+        source.indexOf(`const ${preloadMethod} =`) < 0
+      ) {
         str().prepend(`import { ${preloadMethod} } from "${preloadHelperId}";`)
       }