fix: only return transform for vue files (#428)

* fix: only return transform for vue files

* fix: move return statement inside compiler check

Author: BobbieGoede

packages/unplugin-vue-i18n/src/core/directive.ts

@@ -89,14 +89,13 @@ export function directivePlugin({
               vuePluginOptions,
               translationIdentifiers
             )
+            return {
+              code,
+              map: { version: 3, mappings: '', sources: [] } as any
+            }
           }
         }
       }
-
-      return {
-        code,
-        map: { version: 3, mappings: '', sources: [] } as any
-      }
     }
   }
 }