webpack.config.js

module.exports = {
  entry: './src/index.js',
  output: {
    path: __dirname,
    filename: './dist/index.js',
    libraryTarget: 'commonjs2',
    library: 'react-attr'
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader'
        }
      }
    ]
  }
}