diff --git a/internal/vite-config/src/typing.ts b/internal/vite-config/src/typing.ts
index 69e9fd37..907a723e 100644
--- a/internal/vite-config/src/typing.ts
+++ b/internal/vite-config/src/typing.ts
@@ -139,12 +139,12 @@ type ApplicationOptions = ApplicationPluginOptions;
 
 type LibraryOptions = LibraryPluginOptions;
 
-type DefineApplicationOptions = (config: ConfigEnv) => Promise<{
+type DefineApplicationOptions = (config?: ConfigEnv) => Promise<{
   application?: ApplicationOptions;
   vite?: UserConfig;
 }>;
 
-type DefineLibraryOptions = (config: ConfigEnv) => Promise<{
+type DefineLibraryOptions = (config?: ConfigEnv) => Promise<{
   library?: LibraryOptions;
   vite?: UserConfig;
 }>;