feat: CartRegion link, definition + workflow (#6392)

packages/link-modules/src/definitions/cart-region.ts

@@ -0,0 +1,28 @@
+import { Modules } from "@medusajs/modules-sdk"
+import { ModuleJoinerConfig } from "@medusajs/types"
+
+export const CartRegion: ModuleJoinerConfig = {
+  isLink: true,
+  isReadOnlyLink: true,
+  extends: [
+    {
+      serviceName: Modules.CART,
+      relationship: {
+        serviceName: Modules.REGION,
+        primaryKey: "id",
+        foreignKey: "region_id",
+        alias: "region",
+      },
+    },
+    {
+      serviceName: Modules.REGION,
+      relationship: {
+        serviceName: Modules.CART,
+        primaryKey: "region_id",
+        foreignKey: "id",
+        alias: "carts",
+        isList: true,
+      },
+    },
+  ],
+}

packages/link-modules/src/definitions/index.ts

@@ -1,8 +1,10 @@
+export * from "./cart-region"
+export * from "./cart-sales-channel"
 export * from "./inventory-level-stock-location"
+export * from "./order-sales-channel"
+export * from "./product-sales-channel"
+export * from "./product-shipping-profile"
 export * from "./product-variant-inventory-item"
 export * from "./product-variant-price-set"
-export * from "./product-shipping-profile"
-export * from "./product-sales-channel"
-export * from "./cart-sales-channel"
-export * from "./order-sales-channel"
 export * from "./publishable-api-key-sales-channel"
+