added standartListMerge

src/utils/standartListMerge.js

@@ -0,0 +1,18 @@
+export default (base, obj) => {
+	const validGroups = Object.keys(obj).filter(
+		(key) => Array.isArray(obj[key]?.items) && obj[key].items.length > 0,
+	)
+
+	return validGroups.reduce(
+		(acc, group) => {
+			if (!acc[group]) {
+				acc[group] = { items: [], total_items: 0 }
+			}
+
+			acc[group].items = [...acc[group].items, ...obj[group].items]
+			acc[group].total_items += obj[group].total_items || 0
+			return acc
+		},
+		{ ...base },
+	)
+}