Simple conversion script to import a Symfony-Yaml file into a React-i18n project

i18n.js

import i18n from 'i18next';
import { initReactI18next } from 'react-i18next';
import frYaml from 'js-yaml-loader!../translations/messages.fr.yml';
import enYaml from 'js-yaml-loader!../translations/messages.en.yml';

const splitPlurals = (object) => {
  const newObject = {};
  Object.keys(object).forEach((key) => {
    let elem = object[key];
    if (typeof elem === 'object') {
      newObject[key] = splitPlurals(elem);
      return;
    }
    // replace all symfony parameters %param% with {{param}} in all strings for js
    elem = String(elem).replace(/%([^%]+(?=%))%/gi, '{{$1}}');

    // splits all plurales like "one apple|many apples" into different keys apple and apple_plural
    if (typeof elem === 'string' && elem.includes('|')) {
      const plural = elem.split('|');
      newObject[key] = plural.shift();
      newObject[`${key}_plural`] = plural.shift();

      return;
    }

    newObject[key] = elem;
  });

  return newObject;
};

i18n
  .use(initReactI18next)
  .init({
    resources: {
      fr: {
        translation: splitPlurals(frYaml),
      },
      en: {
        translation: splitPlurals(enYaml),
      },
    },
    lng: (window && window.locale) || 'fr',
    fallbackLng: 'fr',
    // keySeparator: false, // don't count "." as separator
  });

export default i18n;

oh this is custom code for me, you can remove this line and hard-code your default lng

Ah yes, ok, thx for your help and thx you for your quick response :)