add all frontend files

node_modules/antd/es/steps/useLegacyItems.js

@@ -0,0 +1,27 @@
+import * as React from 'react';
+import toArray from "rc-util/es/Children/toArray";
+import { devUseWarning } from '../_util/warning';
+function filter(items) {
+  return items.filter(item => item);
+}
+function useLegacyItems(items, children) {
+  if (process.env.NODE_ENV === 'test') {
+    const warning = devUseWarning('Menu');
+    warning.deprecated(!children, 'Step', 'items');
+  }
+  if (items) {
+    return items;
+  }
+  const childrenItems = toArray(children).map(node => {
+    if (/*#__PURE__*/React.isValidElement(node)) {
+      const {
+        props
+      } = node;
+      const item = Object.assign({}, props);
+      return item;
+    }
+    return null;
+  });
+  return filter(childrenItems);
+}
+export default useLegacyItems;