@base-ui/react/utils/stringifyLocale.mjs

Base UI is a library of headless ('unstyled') React components and low-level hooks. You gain complete control over your app's CSS and accessibility features.

export function stringifyLocale(locale) {
  if (Array.isArray(locale)) {
    return locale.map(value => stringifyLocale(value)).join(',');
  }
  if (locale == null) {
    return '';
  }
  return String(locale);
}