module.exports = api => {
  const isTest = api.env('test');
  api.cache(true);
  return {
    presets: [
      '@babel/preset-typescript',
      [
        '@babel/preset-env',
        {
          targets: {
            browsers: ['last 2 versions'],
          },
          modules: isTest ? 'commonjs' : false,
          useBuiltIns: 'usage',
        },
      ],
    ],
    plugins: ['babel-plugin-rewire'],
  };
};