mark.js

function mark(rv) {
  if (!LOCALE_DEBUG) {
    return rv;
  }
  let proxy = {
    $$typeof: Symbol.for('react.element'),
    type: 'span',
    key: null,
    ref: null,
    props: {
      className: 'translation-wrapper',
      children: typeof rv === 'array' ? rv : [rv]
    },
    _owner: null,
    _store: {}
  };
  proxy.toString = function() {
    return '🇦🇹' + rv + '🇦🇹';
  };
  return proxy;
}