如何分析webpack构建时间

#!/bin/bash

#记录开始时间
start_time=$(date +%s)

#安装及构建
npm install
npm run build

#记录结束时间
end_time=$(date +%s)

#计算执行时间
cost_time=$[ $end_time-$start_time ]

#输出执行时间
echo $cost_time
echo "cost time is $(($cost_time/60))min $(($cost_time%60))s"

$ npm install --save-dev speed-measure-webpack-plugin

const webpackConfig = {
  plugins: [
    new MyPlugin(),
    new MyOtherPlugin()
  ]
}

const SpeedMeasurePlugin = require("speed-measure-webpack-plugin");

const smp = new SpeedMeasurePlugin();

const webpackConfig = smp.wrap({
  plugins: [
	  new MyPlugin(), 
	  new MyOtherPlugin()
  ],
});