New source found from dndbeyond.com

ddb_main/tools/js/Shared/containers/panes/CustomActionPane/CustomActionPane.tsx

@@ -1,5 +1,6 @@
 import React from "react";
 import { connect, DispatchProp } from "react-redux";
+import { AnyAction } from "redux";
 
 import { Collapsible } from "@dndbeyond/character-components/es";
 import {
@@ -40,7 +41,9 @@ type EditCustomContractProperties = Omit<
   "id" | "entityTypeId"
 >;
 
-interface Props extends DispatchProp {
+// TODO: We are typing with AnyAction here to work around issues with UnknownAction, the type that was introduced in Redux 5.
+// If we decide to modernize to Redux 5, we will need to refactor much of the Rules Engine redux usage.
+interface Props extends DispatchProp<AnyAction> {
   actions: Array<Action>;
   entityValueLookup: EntityValueLookup;
   abilityLookup: AbilityLookup;