fix: dedupe assets

Author: sun0day

packages/vite/src/node/plugins/manifest.ts

@@ -95,21 +95,26 @@ export function manifestPlugin(config: ResolvedConfig): Plugin {
           }
         }
 
+        let assetSet: Set<string> | null = null
+
         if (chunk.viteMetadata?.importedAssets.size) {
-          manifestChunk.assets = [...chunk.viteMetadata.importedAssets]
+          assetSet = chunk.viteMetadata.importedAssets
         }
 
         if (chunk.viteMetadata?.importedCss.size) {
           manifestChunk.css = [...chunk.viteMetadata.importedCss]
           manifestChunk.css.forEach((cssFile) => {
             const asset = fileNameToAssetMeta.get(cssFile)
             if (asset?.importedAssets) {
-              manifestChunk.assets ||= []
-              manifestChunk.assets.push(...asset.importedAssets)
+              assetSet = new Set([...(assetSet || []), ...asset.importedAssets])
             }
           })
         }
 
+        if (assetSet?.size) {
+          manifestChunk.assets = [...assetSet]
+        }
+
         return manifestChunk
       }