@mui/styled-engine-sc/esm/GlobalStyles/GlobalStyles.js

styled() API wrapper package for styled-components.

import PropTypes from 'prop-types';
import { createGlobalStyle } from 'styled-components';
function isEmpty(obj) {
  return obj === undefined || obj === null || Object.keys(obj).length === 0;
}
const GlobalStyles = createGlobalStyle(props => {
  const {
    styles,
    defaultTheme = {}
  } = props;
  if (typeof styles === 'function') {
    return styles(isEmpty(props.theme) ? defaultTheme : props.theme);
  }
  return styles;
});
export default GlobalStyles;
GlobalStyles.propTypes = {
  defaultTheme: PropTypes.object,
  styles: PropTypes.oneOfType([PropTypes.array, PropTypes.string, PropTypes.object, PropTypes.func])
};