feat(core-flows,medusa,types): add automatic-taxes to region + generate tax lines endpoint (#6667)

what:

- endpoint to generate tax lines
- update workflows to force calculate tax lines with a flag
- added automatic_taxes to region

packages/medusa/src/api-v2/store/carts/[id]/taxes/route.ts

@@ -0,0 +1,43 @@
+import { updateTaxLinesWorkflow } from "@medusajs/core-flows"
+import { Modules } from "@medusajs/modules-sdk"
+import {
+  ContainerRegistrationKeys,
+  remoteQueryObjectFromString,
+} from "@medusajs/utils"
+import { MedusaRequest, MedusaResponse } from "../../../../../types/routing"
+import { defaultStoreCartFields } from "../../query-config"
+import { StorePostCartsCartTaxesReq } from "../../validators"
+
+export const POST = async (
+  req: MedusaRequest<StorePostCartsCartTaxesReq>,
+  res: MedusaResponse
+) => {
+  const workflow = updateTaxLinesWorkflow(req.scope)
+
+  const { errors } = await workflow.run({
+    input: {
+      cart_or_cart_id: req.params.id,
+      force_tax_calculation: true,
+    },
+    throwOnError: false,
+  })
+
+  if (Array.isArray(errors) && errors[0]) {
+    throw errors[0].error
+  }
+
+  const remoteQuery = req.scope.resolve(ContainerRegistrationKeys.REMOTE_QUERY)
+
+  const query = remoteQueryObjectFromString({
+    entryPoint: Modules.CART,
+    fields: defaultStoreCartFields,
+  })
+
+  const [cart] = await remoteQuery(query, {
+    cart: { id: req.params.id },
+  })
+
+  // TODO: wrap result with totals when totals calculation is ready
+
+  res.status(200).json({ cart })
+}

packages/medusa/src/api-v2/store/carts/query-config.ts

@@ -66,6 +66,7 @@ export const defaultStoreCartFields = [
   "region.id",
   "region.name",
   "region.currency_code",
+  "region.automatic_taxes",
   "sales_channel_id",
 
   // TODO: To be updated when payment sessions are introduces in the Rest API

packages/medusa/src/api-v2/store/carts/validators.ts

@@ -114,3 +114,5 @@ export class StorePostCartsCartReq {
   // @Type(() => Discount)
   // discounts?: Discount[]
 }
+
+export class StorePostCartsCartTaxesReq {}