Handle validation for duplicated emails

lib/bigcommerce/api/customers/handlers/create-customer.ts

@@ -1,3 +1,4 @@
+import { BigcommerceApiError } from '../../utils/errors'
 import { CustomersHandlers } from '..'
 
 const createCustomer: CustomersHandlers['createCustomer'] = async ({
@@ -12,25 +13,46 @@ const createCustomer: CustomersHandlers['createCustomer'] = async ({
       errors: [{ message: 'Invalid request' }],
     })
   }
-  // TODO: validate the password.
+  // TODO: validate the password and email
   // Passwords must be at least 7 characters and contain both alphabetic
   // and numeric characters.
 
-  const { data } = await config.storeApiFetch('/v3/customers', {
-    method: 'POST',
-    body: JSON.stringify([
-      {
-        first_name: firstName,
-        last_name: lastName,
-        email,
-        authentication: {
-          new_password: password,
+  try {
+    const { data } = await config.storeApiFetch('/v3/customers', {
+      method: 'POST',
+      body: JSON.stringify([
+        {
+          first_name: firstName,
+          last_name: lastName,
+          email,
+          authentication: {
+            new_password: password,
+          },
         },
-      },
-    ]),
-  })
+      ]),
+    })
 
-  res.status(200).json({ data })
+    res.status(200).json({ data })
+  } catch (error) {
+    if (error instanceof BigcommerceApiError && error.status === 422) {
+      const hasEmailError = '0.email' in error.data?.errors
+
+      // If there's an error with the email, it most likely means it's duplicated
+      if (hasEmailError) {
+        return res.status(400).json({
+          data: null,
+          errors: [
+            {
+              message: 'The email is already in use',
+              code: 'duplicated_email',
+            },
+          ],
+        })
+      }
+    }
+
+    throw error
+  }
 }
 
 export default createCustomer

lib/bigcommerce/api/utils/create-api-handler.ts

@@ -27,7 +27,7 @@ export type BigcommerceHandlers<T = any> = {
 
 export type BigcommerceApiResponse<T> = {
   data: T | null
-  errors?: { message: string }[]
+  errors?: { message: string; code?: string }[]
 }
 
 export default function createApiHandler<