i18n.js

/**
 * i18n.js
 *
 * This will setup the i18n language files and locale data for your app.
 *
 *   IMPORTANT: This file is used by the internal build
 *   script `extract-intl`, and must use CommonJS module syntax
 *   You CANNOT use import/export in this file.
 */
//eslint-disable-line
import '@formatjs/intl-relativetimeformat/polyfill';

const enTranslationMessages = require('./lang/en.json');

export const DEFAULT_LOCALE = 'en';

// prettier-ignore
export const appLocales = [
  'en',
];

export const formatTranslationMessages = (locale, messages) => {
  const defaultFormattedMessages =
    locale !== DEFAULT_LOCALE ? formatTranslationMessages(DEFAULT_LOCALE, enTranslationMessages) : {};
  const flattenFormattedMessages = (formattedMessages, key) => {
    const formattedMessage =
      !messages[key] && locale !== DEFAULT_LOCALE ? defaultFormattedMessages[key] : messages[key];
    return Object.assign(formattedMessages, { [key]: formattedMessage });
  };
  return Object.keys(messages).reduce(flattenFormattedMessages, {});
};

export const translationMessages = {
  en: formatTranslationMessages('en', enTranslationMessages)
};