demo: update demo code (#39982)

* type: add Tab type

* add notes

* update demo code

.dumi/loading.js

@@ -1,2 +1,3 @@
+// must be .js file, can't modify to be .ts file!
 // eslint-disable-next-line no-restricted-exports
 export { default } from './theme/common/Loading';

components/tabs/demo/basic.tsx

@@ -1,32 +1,29 @@
 import React from 'react';
 import { Tabs } from 'antd';
+import type { TabsProps } from 'antd';
 
 const onChange = (key: string) => {
   console.log(key);
 };
 
-const App: React.FC = () => (
-  <Tabs
-    defaultActiveKey="1"
-    onChange={onChange}
-    items={[
-      {
-        label: `Tab 1`,
-        key: '1',
-        children: `Content of Tab Pane 1`,
-      },
-      {
-        label: `Tab 2`,
-        key: '2',
-        children: `Content of Tab Pane 2`,
-      },
-      {
-        label: `Tab 3`,
-        key: '3',
-        children: `Content of Tab Pane 3`,
-      },
-    ]}
-  />
-);
+const items: TabsProps['items'] = [
+  {
+    key: '1',
+    label: `Tab 1`,
+    children: `Content of Tab Pane 1`,
+  },
+  {
+    key: '2',
+    label: `Tab 2`,
+    children: `Content of Tab Pane 2`,
+  },
+  {
+    key: '3',
+    label: `Tab 3`,
+    children: `Content of Tab Pane 3`,
+  },
+];
+
+const App: React.FC = () => <Tabs defaultActiveKey="1" items={items} onChange={onChange} />;
 
 export default App;

components/tabs/index.tsx

@@ -6,7 +6,6 @@ import type { TabsProps as RcTabsProps } from 'rc-tabs';
 import RcTabs from 'rc-tabs';
 import type { EditableConfig } from 'rc-tabs/lib/interface';
 import * as React from 'react';
-
 import { ConfigContext } from '../config-provider';
 import type { SizeType } from '../config-provider/SizeContext';
 import SizeContext from '../config-provider/SizeContext';