@react-ui-org/react-ui/src/components/Modal/_helpers/getScrollingClassName.js

React UI is a themeable UI library for React apps.

export const getScrollingClassName = (type, styles) => {
  if (type === 'auto') {
    return styles.isRootScrollingAuto;
  }

  if (type === 'custom') {
    return styles.isRootScrollingCustom;
  }

  return null;
};