updated to use i18n in one throw

x-pack/plugins/lists/public/exceptions/hooks/translations.ts

@@ -0,0 +1,15 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { i18n } from '@kbn/i18n';
+
+export const ADD_EXCEPTION_ITEM_TYPE_ERROR = i18n.translate(
+  'xpack.lists.exceptions.hooks.addExceptionItemTypeError',
+  {
+    defaultMessage: 'Unable to create exception item. Item malformed.',
+  }
+);

x-pack/plugins/lists/public/exceptions/hooks/use_api.ts

@@ -20,6 +20,7 @@ import { ApiCallFindListsItemsMemoProps, ApiCallMemoProps, ApiListExportProps }
 import { getIdsAndNamespaces } from '../utils';
 import { transformInput, transformOutput } from '../transforms';
 
+import * as i18n from './translations';
 export interface ExceptionsApi {
   addExceptionListItem: (arg: {
     listItem: CreateExceptionListItemSchema;
@@ -49,14 +50,20 @@ export const useApi = (http: HttpStart): ExceptionsApi => {
       }): Promise<ExceptionListItemSchema> {
         const abortCtrl = new AbortController();
         const sanitizedItem = transformOutput(listItem);
+
+        // This was added to satisfy Typescript, which I don't love,
+        // but felt better than doing an `as` cast. Wasn't able to
+        // figure out how to do a generic to specify that input is of
+        // type A or B, and if it is A returns A, if B returns B. Can
+        // delete this if/else statement if figured out
         if (createExceptionListItemSchema.is(sanitizedItem)) {
           return Api.addExceptionListItem({
             http,
             listItem: sanitizedItem,
             signal: abortCtrl.signal,
           });
         } else {
-          throw new Error('Unable to create exception item. Item malformed.');
+          throw new Error(i18n.ADD_EXCEPTION_ITEM_TYPE_ERROR);
         }
       },
       async deleteExceptionItem({