New source found from dndbeyond.com

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

@@ -1,5 +1,6 @@
 import React from "react";
 import { connect, DispatchProp } from "react-redux";
+import { AnyAction } from "redux";
 
 import {
   BaseInventoryContract,
@@ -49,7 +50,9 @@ import { appEnvSelectors } from "../../../selectors";
 import { SharedAppState } from "../../../stores/typings";
 import { PaneIdentifierUtils } from "../../../utils";
 
-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> {
   spells: Array<Spell>;
   spellCasterInfo: SpellCasterInfo;
   ruleData: RuleData;