Index: node_modules/react-redux/src/utils/verifyPlainObject.ts
===================================================================
--- node_modules/react-redux/src/utils/verifyPlainObject.ts	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
+++ node_modules/react-redux/src/utils/verifyPlainObject.ts	(revision a762898ecd37a452c782821d4c2c4955c6ed2521)
@@ -0,0 +1,14 @@
+import isPlainObject from './isPlainObject'
+import warning from './warning'
+
+export default function verifyPlainObject(
+  value: unknown,
+  displayName: string,
+  methodName: string,
+) {
+  if (!isPlainObject(value)) {
+    warning(
+      `${methodName}() in ${displayName} must return a plain object. Instead received ${value}.`,
+    )
+  }
+}