webpack.config.js

require('babel-loader')
var webpack = require('webpack');
var CopyWebpackPlugin = require('copy-webpack-plugin');

module.exports = {
  entry: {
    path: './src/main.js'
  },
  output: {
    path: './build',
    filename: 'bundle.js'
  },
  module: {
    loaders: [
      {
        test: /\.scss$/,
        loaders: ["style", "css", "sass"]
      },
      {
        test: /.jsx?$/,
        loader: 'babel-loader',
        exclude: /node_modules/,
        query: {
          presets: ['es2015', 'react']
        }
      }
    ]
  },
  plugins: [
    new CopyWebpackPlugin([{from: './src/index.html', to: '/index.html'}]),
    new webpack.HotModuleReplacementPlugin()
  ],
  devtool: 'eval-source-map',
  devServer: {
    contentBase: './build',
    inline: true,
    hot: true
  }
}