fix: Fixes to product module and improving tests (#6898)

packages/types/src/product/common.ts

@@ -579,6 +579,18 @@ export interface ProductVariantOptionDTO {
    * The associated product variant id.
    */
   variant_id?: string | null
+  /**
+   * When the product variant option was created.
+   */
+  created_at: string | Date
+  /**
+   * When the product variant option was updated.
+   */
+  updated_at: string | Date
+  /**
+   * When the product variant option was deleted.
+   */
+  deleted_at?: string | Date
 }
 
 /**

packages/types/src/product/service.ts

@@ -259,10 +259,7 @@ export interface IProductModuleService extends IModuleService {
    *   title: "Shirt",
    * })
    */
-  upsert(
-    data: UpsertProductDTO[],
-    sharedContext?: Context
-  ): Promise<ProductDTO[]>
+  upsert(data: UpsertProductDTO, sharedContext?: Context): Promise<ProductDTO>
 
   /**
    * This method is used to update a product.