Initial work, copied from the Shopify provider

framework/saleor/utils/throw-user-errors.ts

@@ -0,0 +1,38 @@
+import { ValidationError } from '@commerce/utils/errors'
+
+import {
+  CheckoutErrorCode,
+  CheckoutUserError,
+  CustomerErrorCode,
+  CustomerUserError,
+} from '../schema'
+
+export type UserErrors = Array<CheckoutUserError | CustomerUserError>
+
+export type UserErrorCode =
+  | CustomerErrorCode
+  | CheckoutErrorCode
+  | null
+  | undefined
+
+const getCustomMessage = (code: UserErrorCode, message: string) => {
+  switch (code) {
+    case 'UNIDENTIFIED_CUSTOMER':
+      message = 'Cannot find an account that matches the provided credentials'
+      break
+  }
+  return message
+}
+
+export const throwUserErrors = (errors?: UserErrors) => {
+  if (errors && errors.length) {
+    throw new ValidationError({
+      errors: errors.map(({ code, message }) => ({
+        code: code ?? 'validation_error',
+        message: getCustomMessage(code, message),
+      })),
+    })
+  }
+}
+
+export default throwUserErrors