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/CoinManagerContext.tsx

@@ -0,0 +1,21 @@
+import React, { useMemo } from "react";
+
+import { CoinManager } from "@dndbeyond/character-rules-engine/es";
+
+interface CoinManagerContextValue {
+  coinManager: CoinManager | null;
+}
+const initContext: CoinManagerContextValue = {
+  coinManager: null,
+};
+export const CoinManagerContext =
+  React.createContext<CoinManagerContextValue>(initContext);
+
+export function CoinManagerProvider({ children }) {
+  const coinManager: CoinManager = useMemo(() => new CoinManager(), []);
+  return (
+    <CoinManagerContext.Provider value={{ coinManager }}>
+      {children}
+    </CoinManagerContext.Provider>
+  );
+}