@mui/private-theming/esm/useTheme/useTheme.js

Private - The React theme context to be shared between `@mui/styles` and `@mui/material`.

import * as React from 'react';
import ThemeContext from "./ThemeContext.js";
export default function useTheme() {
  const theme = React.useContext(ThemeContext);
  if (process.env.NODE_ENV !== 'production') {
    // TODO: uncomment once we enable eslint-plugin-react-compiler eslint-disable-next-line react-compiler/react-compiler
    // eslint-disable-next-line react-hooks/rules-of-hooks -- It's not required to run React.useDebugValue in production
    React.useDebugValue(theme);
  }
  return theme;
}