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/store/configureStore.ts

@@ -0,0 +1,19 @@
+import { Store } from "redux";
+
+import builderSaga from "../../CharacterBuilder/sagas/builder";
+import { StateStoreUtils } from "../../Shared/stores";
+import rootReducer from "../reducers/index";
+import sheetSaga from "../sagas/sheet";
+
+let store;
+export default function configureStore(initialState?: any): Store {
+  let sagaMiddleware: Array<any> = [sheetSaga, builderSaga];
+  if (!store) {
+    store = StateStoreUtils.configureStore(
+      initialState,
+      rootReducer,
+      sagaMiddleware
+    );
+  }
+  return store;
+}