diff --git a/packages/vite/src/node/build.ts b/packages/vite/src/node/build.ts
index 75f207482d010c..1ef0dcddbb93a1 100644
--- a/packages/vite/src/node/build.ts
+++ b/packages/vite/src/node/build.ts
@@ -920,7 +920,10 @@ export function resolveBuildOutputs(
     }
 
     outputs.forEach((output) => {
-      if (['umd', 'iife'].includes(output.format!) && !output.name) {
+      if (
+        (output.format === 'umd' || output.format === 'iife') &&
+        !output.name
+      ) {
         throw new Error(
           'Entries in "build.rollupOptions.output" must specify "name" when the format is "umd" or "iife".',
         )
diff --git a/packages/vite/src/node/plugins/workerImportMetaUrl.ts b/packages/vite/src/node/plugins/workerImportMetaUrl.ts
index 22a5de2ec67b06..4065c6470aca98 100644
--- a/packages/vite/src/node/plugins/workerImportMetaUrl.ts
+++ b/packages/vite/src/node/plugins/workerImportMetaUrl.ts
@@ -82,7 +82,10 @@ function getWorkerType(raw: string, clean: string, i: number): WorkerType {
   }
 
   const workerOpts = parseWorkerOptions(workerOptString, commaIndex + 1)
-  if (workerOpts.type && ['classic', 'module'].includes(workerOpts.type)) {
+  if (
+    workerOpts.type &&
+    (workerOpts.type === 'module' || workerOpts.type === 'classic')
+  ) {
     return workerOpts.type
   }