chore: fix missing test

integration-tests/plugins/__tests__/product/admin/import-products.spec.ts

@@ -315,19 +315,18 @@ describe("Product import batch job", () => {
           profile_id: expect.any(String),
           variants: expect.arrayContaining([
             // UPDATED VARIANT
-            // TODO: figure out why this isn't being returned
-            // expect.objectContaining({
-            //   id: "existing-variant-id",
-            //   title: "Test variant changed",
-            //   sku: "test-sku-4",
-            //   barcode: "test-barcode-4",
-            //   options: [
-            //     expect.objectContaining({
-            //       value: "Large",
-            //       option_id: "opt-1-id",
-            //     }),
-            //   ],
-            // }),
+            expect.objectContaining({
+              id: "existing-variant-id",
+              title: "Test variant changed",
+              sku: "test-sku-4",
+              barcode: "test-barcode-4",
+              options: [
+                expect.objectContaining({
+                  value: "Large",
+                  option_id: "opt-1-id",
+                }),
+              ],
+            }),
             // CREATED VARIANT
             expect.objectContaining({
               title: "Test variant",

packages/product/src/services/product-module-service.ts

@@ -67,15 +67,15 @@ import {
   MedusaError,
   promiseAll,
 } from "@medusajs/utils"
+import {
+  CreateProductOptionValueDTO,
+  UpdateProductOptionValueDTO,
+} from "../types/services/product-option-value"
 import {
   entityNameToLinkableKeysMap,
   joinerConfig,
   LinkableKeys,
 } from "./../joiner-config"
-import {
-  CreateProductOptionValueDTO,
-  UpdateProductOptionValueDTO,
-} from "../types/services/product-option-value"
 
 type InjectedDependencies = {
   baseRepository: DAL.RepositoryService
@@ -1063,6 +1063,10 @@ export default class ProductModuleService<
 
     const existingProductVariantsMap = new Map<string, ProductVariant[]>(
       data.map((productData) => {
+        if (productData.variants === undefined) {
+          return [productData.id, []]
+        }
+
         const productVariantsForProduct = existingProductVariants.filter(
           (variant) => variant.product_id === productData.id
         )