webpack.config.js

const path = require('path');
module.exports = {
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist/js/')
  },
  module: {
    rules: [{
      test: /.jsx?$/,
      include: [
        path.resolve(__dirname, 'src')
      ],
      exclude: [
        path.resolve(__dirname, 'node_modules'),
        path.resolve(__dirname, 'bower_components')
      ],
      loader: 'babel-loader',
      query: {
        presets: ['babel-preset-react']
      }
    },
{
        test: /\.css$/,
        use: [
          {
            loader: "style-loader" // creates style nodes from JS strings
          },
          {
            loader: "css-loader" // translates CSS into CommonJS
          },
        ]
}

]
  },
  resolve: {
    extensions: ['.json', '.js', '.jsx', '.css']
  },
  devtool: 'source-map',
  devServer: {
    publicPath: path.join('/dist/js/')
  }
};