Grabbed dndbeyond's source code

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

ddb_main/node_modules/@mui/private-theming/useTheme/ThemeContext.js

@@ -0,0 +1,6 @@
+import * as React from 'react';
+const ThemeContext = /*#__PURE__*/React.createContext(null);
+if (process.env.NODE_ENV !== 'production') {
+  ThemeContext.displayName = 'ThemeContext';
+}
+export default ThemeContext;

ddb_main/node_modules/@mui/private-theming/useTheme/useTheme.js

@@ -0,0 +1,10 @@
+import * as React from 'react';
+import ThemeContext from './ThemeContext';
+export default function useTheme() {
+  const theme = React.useContext(ThemeContext);
+  if (process.env.NODE_ENV !== 'production') {
+    // eslint-disable-next-line react-hooks/rules-of-hooks
+    React.useDebugValue(theme);
+  }
+  return theme;
+}