@mui/joy/styles/styled.js

Joy UI is an open-source React component library that implements MUI's own design principles. It's comprehensive and can be used in production out of the box.

import { createStyled } from '@mui/system';
import defaultTheme from './defaultTheme';
import THEME_ID from './identifier';
const styled = createStyled({
  defaultTheme,
  themeId: THEME_ID
});
export default styled;