old_contents: require('dotenv').config();
  
  // Project-wide config
  //
  module.exports = {
    presets: [
      [
        '@babel/preset-env',
        {
          targets: {
            node: 'current',
          },
        },
      ],
    ],
    plugins: [
      [
        'ttag',
        { resolve: { translations: `i18n/${process.env.LOCALE || 'en_US'}.po` } },
      ],
      ['module-resolver', { root: ['./'] }],
      '@babel/plugin-proposal-class-properties',
    ],
  };
  
new_contents: require('dotenv').config();
  
  const locale = process.env.LOCALE || 'en_US';
  console.log('[babel.config.js] building locale: ', locale);
  
  // Project-wide config
  //
  module.exports = {
    presets: [
      [
        '@babel/preset-env',
        {
          targets: {
            node: 'current',
          },
        },
      ],
    ],
    plugins: [
      ['ttag', { resolve: { translations: `i18n/${locale}.po` } }],
      ['module-resolver', { root: ['./'] }],
      '@babel/plugin-proposal-class-properties',
    ],
  };
  
subject: Print built locales