seantomburke / sitemapper

export default (api) => {

  api.cache(true);

  const presets = [

    [

      '@babel/preset-env',

      {

        targets: {

          esmodules: true,

        },

        modules: false, // Output ES modules

      },

    ],

    'minify', // minify the Babel code

  ];

  // Add the istanbul plugin for coverage instrumentation in test environment

  const plugins = [];

  if (process.env.NODE_ENV === 'test') {

    plugins.push('babel-plugin-istanbul');

  }

  return {

    presets,

    plugins,

    comments: false, // Remove comments during minification

  };

};