Index: node_modules/recharts/lib/zIndex/getZIndexFromUnknown.js
===================================================================
--- node_modules/recharts/lib/zIndex/getZIndexFromUnknown.js	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
+++ node_modules/recharts/lib/zIndex/getZIndexFromUnknown.js	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
@@ -0,0 +1,13 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.getZIndexFromUnknown = getZIndexFromUnknown;
+var _isWellBehavedNumber = require("../util/isWellBehavedNumber");
+function getZIndexFromUnknown(input, defaultZIndex) {
+  if (input && typeof input === 'object' && 'zIndex' in input && typeof input.zIndex === 'number' && (0, _isWellBehavedNumber.isWellBehavedNumber)(input.zIndex)) {
+    return input.zIndex;
+  }
+  return defaultZIndex;
+}