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/Shared/managers/CharacterFeaturesManagerContext.tsx

@@ -0,0 +1,26 @@
+import React, { useMemo } from "react";
+
+import { CharacterFeaturesManager } from "@dndbeyond/character-rules-engine/es";
+
+interface CharacterFeaturesManagerContextValue {
+  characterFeaturesManager: CharacterFeaturesManager;
+}
+const initContext: CharacterFeaturesManagerContextValue = {
+  characterFeaturesManager: new CharacterFeaturesManager(),
+};
+export const CharacterFeaturesManagerContext =
+  React.createContext<CharacterFeaturesManagerContextValue>(initContext);
+
+export function CharacterFeaturesManagerProvider({ children }) {
+  const characterFeaturesManager: CharacterFeaturesManager = useMemo(
+    () => new CharacterFeaturesManager(),
+    []
+  );
+  return (
+    <CharacterFeaturesManagerContext.Provider
+      value={{ characterFeaturesManager }}
+    >
+      {children}
+    </CharacterFeaturesManagerContext.Provider>
+  );
+}