性能分析插件

性能分析 (存在问题，待验证)

https://www.cnblogs.com/rever/p/10978703.html

npm install --save-dev stats-webpack-plugin

const StatsPlugin = require('stats-webpack-plugin')

new StatsPlugin('stats.json', {
        chunkModules: true,
        chunks: true,
        assets: false,
        modules: true,
        children: true,
        chunksSort: true,
        assetsSort: true
      })