@winstrike/next-i18next-koa/dist/es/utils/locale-subpath-required.js

The easiest way to translate your NextJs apps. With Koa support only. Forked from 'next-i18next'.

import { localeSubpathOptions } from '../config/default-config';
export default ((nextI18NextInternals, lng) => {
  const {
    defaultLanguage,
    localeSubpaths
  } = nextI18NextInternals.config;

  if (lng) {
    if (localeSubpaths === localeSubpathOptions.NONE) {
      return false;
    }

    if (localeSubpaths === localeSubpathOptions.FOREIGN && lng !== defaultLanguage) {
      return true;
    }

    if (localeSubpaths === localeSubpathOptions.ALL) {
      return true;
    }
  }

  return false;
});