diff --git a/packages/vite/src/node/optimizer/index.ts b/packages/vite/src/node/optimizer/index.ts
index f8b28bd9882f43..01646d68dcd417 100644
--- a/packages/vite/src/node/optimizer/index.ts
+++ b/packages/vite/src/node/optimizer/index.ts
@@ -412,10 +412,7 @@ export async function runOptimizeDeps(
       try {
         exportsData = parse(entryContent) as ExportsData
       } catch {
-        const loader =
-          (esbuildOptions.loader &&
-            esbuildOptions.loader[path.extname(filePath)]) ||
-          'jsx'
+        const loader = esbuildOptions.loader?.[path.extname(filePath)] || 'jsx'
         debug(
           `Unable to parse dependency: ${id}. Trying again with a ${loader} transform.`
         )
diff --git a/packages/vite/src/node/optimizer/scan.ts b/packages/vite/src/node/optimizer/scan.ts
index cf566fe5ad6420..ef59a35b1d22d3 100644
--- a/packages/vite/src/node/optimizer/scan.ts
+++ b/packages/vite/src/node/optimizer/scan.ts
@@ -463,22 +463,26 @@ function esbuildScanPlugin(
           contents = config.esbuild.jsxInject + `\n` + contents
         }
 
+        const loader =
+          config.optimizeDeps?.esbuildOptions?.loader?.[`.${ext}`] ||
+          (ext as Loader)
+
         if (contents.includes('import.meta.glob')) {
           return transformGlob(
             contents,
             id,
             config.root,
-            ext as Loader,
+            loader,
             resolve,
             config.logger
           ).then((contents) => ({
-            loader: ext as Loader,
+            loader,
             contents
           }))
         }
-        const { loader } = config.optimizeDeps?.esbuildOptions ?? {}
+
         return {
-          loader: ((loader && loader[`.${ext}`]) || ext) as Loader,
+          loader,
           contents
         }
       })