javascript - react webpack.config.js 文件都声明了哪些内容

var path = require('path')
var webpack = require('webpack')

module.exports = {
  devtool: 'cheap-module-eval-source-map',
  entry: [
    'webpack-hot-middleware/client',
    './index'
  ],
  output: {
    path: path.join(__dirname, 'dist'),
    filename: 'bundle.js',
    publicPath: '/static/'
  },
  plugins: [
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.HotModuleReplacementPlugin()
  ],
  module: {
    loaders: [
      {
        test: /\.js$/,
        loaders: [ 'babel' ],
        exclude: /node_modules/,
        include: __dirname
      },
      {
        test: /\.css?$/,
        loaders: [ 'style', 'raw' ],
        include: __dirname
      }
    ]
  }
}

求大手给解释下这个配置文件都写了些什么东东，完全不理解!!