next-i18next/dist/es/create-client/node.js

The easiest way to translate your NextJs apps.

import i18n from 'i18next';
import i18nextFSBackend from 'i18next-fs-backend/cjs';
import i18nextMiddleware from 'i18next-http-middleware/cjs';
export default (config => {
  let initPromise;

  if (!i18n.isInitialized) {
    i18n.use(i18nextFSBackend);

    if (config.serverLanguageDetection) {
      const serverDetectors = new i18nextMiddleware.LanguageDetector();
      config.customDetectors.forEach(detector => serverDetectors.addDetector(detector));
      i18n.use(serverDetectors);
    }

    config.use.forEach(x => i18n.use(x));
    initPromise = i18n.init(config);
  }

  return {
    i18n,
    initPromise
  };
});