Index: node_modules/redux/src/utils/isPlainObject.ts
===================================================================
--- node_modules/redux/src/utils/isPlainObject.ts	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
+++ node_modules/redux/src/utils/isPlainObject.ts	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
@@ -0,0 +1,16 @@
+/**
+ * @param obj The object to inspect.
+ * @returns True if the argument appears to be a plain object.
+ */
+export default function isPlainObject(obj: any): obj is object {
+  if (typeof obj !== 'object' || obj === null) return false
+
+  let proto = obj
+  while (Object.getPrototypeOf(proto) !== null) {
+    proto = Object.getPrototypeOf(proto)
+  }
+
+  return (
+    Object.getPrototypeOf(obj) === proto || Object.getPrototypeOf(obj) === null
+  )
+}