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/AttributesManagerContext.tsx

@@ -0,0 +1,24 @@
+import React, { useMemo } from "react";
+
+import { AttributesManager } from "@dndbeyond/character-rules-engine/es";
+
+interface AttributesManagerContextValue {
+  attributesManager: AttributesManager;
+}
+const initContext: AttributesManagerContextValue = {
+  attributesManager: new AttributesManager(),
+};
+export const AttributesManagerContext =
+  React.createContext<AttributesManagerContextValue>(initContext);
+
+export function AttributesManagerProvider({ children }) {
+  const attributesManager: AttributesManager = useMemo(
+    () => new AttributesManager(),
+    []
+  );
+  return (
+    <AttributesManagerContext.Provider value={{ attributesManager }}>
+      {children}
+    </AttributesManagerContext.Provider>
+  );
+}