diff --git a/packages/vite/src/node/plugins/manifest.ts b/packages/vite/src/node/plugins/manifest.ts
index a6e9608ed16c08..a82897ca6adb36 100644
--- a/packages/vite/src/node/plugins/manifest.ts
+++ b/packages/vite/src/node/plugins/manifest.ts
@@ -11,6 +11,8 @@ import { normalizePath, sortObjectKeys } from '../utils'
 import { generatedAssets } from './asset'
 import type { GeneratedAssetMeta } from './asset'
 
+const endsWithJSRE = /\.[cm]?js$/
+
 export type Manifest = Record<string, ManifestChunk>
 
 export interface ManifestChunk {
@@ -134,7 +136,9 @@ export function manifestPlugin(config: ResolvedConfig): Plugin {
 
           // If JS chunk and asset chunk are both generated from the same source file,
           // prioritize JS chunk as it contains more information
-          if (manifest[src]?.file.endsWith('.js')) continue
+          const file = manifest[src]?.file
+          if (file && endsWithJSRE.test(file)) continue
+
           manifest[src] = asset
           fileNameToAsset.set(chunk.fileName, asset)
         }