.babelrc.js

module.exports = {
  env: {
    test: {
      plugins: [
        [
          'istanbul',
          {
            exclude: ['spec/**/*.js']
          }
        ]
      ]
    }
  },
  presets: [
    [
      '@babel/preset-env',
      {
        targets: {
          node: 'current'
        }
      }
    ]
  ],
  plugins: [
    '@babel/plugin-proposal-class-properties',
    '@babel/plugin-transform-classes',
    '@babel/plugin-proposal-object-rest-spread'
  ]
}