Grabbed dndbeyond's source code

```
~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js
```

ddb_main/tools/js/CharacterSheet/reducers/index.ts

@@ -0,0 +1,40 @@
+import { routerReducer } from "react-router-redux";
+import { combineReducers } from "redux";
+
+import { defaultReducers } from "@dndbeyond/character-rules-engine/es";
+
+import builder from "../../CharacterBuilder/reducers/builder";
+import appEnv from "../../Shared/reducers/appEnv";
+import appInfo from "../../Shared/reducers/appInfo";
+import rollResult from "../../Shared/reducers/rollResult";
+import toastMessage from "../../Shared/reducers/toastMessage";
+import sheet from "./sheet";
+
+const initialRouteControls = {
+  currentPath: "",
+  navigate: (route) => {
+    console.log("navigate not setup failed to go to", route);
+  },
+};
+const rootReducer = combineReducers({
+  ...defaultReducers,
+  appEnv,
+  appInfo,
+  sheet,
+  builder,
+  toastMessage,
+  rollResult,
+  router: routerReducer,
+  routeControls: (state = initialRouteControls, action) => {
+    switch (action.type) {
+      case "SET_ROUTE_CONTROLS":
+        return action.payload;
+      default:
+        break;
+    }
+
+    return state;
+  },
+});
+
+export default rootReducer;

ddb_main/tools/js/CharacterSheet/reducers/sheet.ts

@@ -0,0 +1,24 @@
+import { SheetAction, sheetActionTypes } from "../actions/sheet";
+import { SheetState } from "../typings";
+
+const initialState: SheetState = {
+  initFailed: false,
+  initError: null,
+};
+function sheet(
+  state: SheetState = initialState,
+  action: SheetAction
+): SheetState {
+  switch (action.type) {
+    case sheetActionTypes.CHARACTER_RECEIVE_FAIL:
+      return {
+        ...state,
+        initFailed: true,
+        initError: action.payload.error,
+      };
+  }
+
+  return state;
+}
+
+export default sheet;