module.exports = api => {
  const isTest = api.env('test');

  const preset = ['@babel/preset-env', { targets: 'defaults' }];
  const testPreset = ['@babel/preset-env', { targets: { node: process.versions.node } }];

  const plugins = [
    '@babel/plugin-transform-react-jsx',
    '@babel/plugin-proposal-class-properties',
  ];

  return {
    presets: [isTest ? testPreset : preset],
    plugins: plugins,
  };
};