export createLocalStorage in UMD bundle (#3359)

resolves #3358

Author: acao

.changeset/nice-cheetahs-deny.md

@@ -0,0 +1,5 @@
+---
+"graphiql": patch
+---
+
+export createLocalStorage in UMD bundle

packages/graphiql/src/cdn.ts

@@ -5,7 +5,7 @@
  *  LICENSE file in the root directory of this source tree.
  */
 import * as GraphiQLReact from '@graphiql/react';
-import { createGraphiQLFetcher } from '@graphiql/toolkit';
+import { createGraphiQLFetcher, createLocalStorage } from '@graphiql/toolkit';
 import * as GraphQL from 'graphql';
 import { GraphiQL } from './components/GraphiQL';
 
@@ -25,6 +25,12 @@ import './style.css';
 // @ts-expect-error
 GraphiQL.createFetcher = createGraphiQLFetcher;
 
+/**
+ * This function is needed in order to easily generate a custom storage namespace
+ */
+// @ts-expect-error
+GraphiQL.createLocalStorage = createLocalStorage;
+
 /**
  * We also add the complete `graphiql-js` exports so that this instance of
  * `graphiql-js` can be reused from plugin CDN bundles.