How to use the ttag.addLocale function in ttag

function loadLocalizationFromPOFile(locale, poFileContent) {
  const localization = gettextParser.po.parse(poFileContent);
  // addLocale(locale, removeEmptyTranslations(localization));
  addLocale(locale, localization);
  return localization;
}

export function addTranslationsToTTag(translations: Translations[]) {
  const localesToUse: Locale[] = [];

  // register with ttag
  for (const t of translations) {
    const locale = localeFromString(t.headers.language);
    addLocale(locale.string, t);
    localesToUse.push(locale);
  }

  console.log('Available locales:', localesToUse.map(l => l.string));

  // set locale in ttag
  useLocales(localesToUse.map(locale => locale.string));

  // update active locales
  // we need to modify the actual array content, so that all imported references get the changes
  currentLocales.splice(0, currentLocales.length);
  currentLocales.push(...localesToUse);
}

const { t, ngettext, msgid, addLocale, useLocale } = require('ttag');

const locale = process.env.LOCALE;

if (locale) {
    const translationObj = require(`./${locale}.po.json`);
    addLocale(locale, translationObj);
    useLocale(locale);
}

function startCount(n) {
    console.log(t`starting count up to ${n}`);
    for (let i = 0; i <= n; i++) {
        console.log(ngettext(msgid`${i} tick passed`, `${i} ticks passed`, i));
    }
}

startCount(3);

export function changeLocale(locale: string) {
  console.log(locale);
  const translationObj = getTranslationObj(locale);
  addLocale(locale, translationObj);
  useLocale(locale);
}

import { addLocale, useLocale } from 'ttag';

if (process.env.NODE_ENV !== 'production') {
    const ukLocale = require('./uk.po');
    addLocale('uk', ukLocale);
    useLocale('uk');
}