babel.config.js

module.exports = api => {
  api.cache(true);

  return {
    presets: [
      [
        '@babel/preset-env',
        {
          modules: false,
          useBuiltIns: 'entry'
        }
      ],
      '@babel/preset-react'
    ],
    plugins: [
      '@babel/plugin-proposal-class-properties',
      '@babel/plugin-proposal-object-rest-spread'
    ]
  };
};