Index: node_modules/recharts/lib/util/getClassNameFromUnknown.js
===================================================================
--- node_modules/recharts/lib/util/getClassNameFromUnknown.js	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
+++ node_modules/recharts/lib/util/getClassNameFromUnknown.js	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
@@ -0,0 +1,12 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getClassNameFromUnknown = getClassNameFromUnknown;
+function getClassNameFromUnknown(u) {
+  if (u && typeof u === 'object' && 'className' in u && typeof u.className === 'string') {
+    return u.className;
+  }
+  return '';
+}