webpack4 优化耗时分析speed-measure-webpack-plugin插件

最新推荐文章于 2025-05-30 16:32:33 发布

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本文介绍了如何使用speed-measure-webpack-plugin插件来测量和优化webpack配置中的下载、loader和plugin耗时，通过颜色提示监控过长执行时间。实例展示了配置过程和关键代码片段，帮助开发者提升构建效率。

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能够列出输出、loader和plugins的耗时,过长将会使用黄色和红色显示
1、下载
	cnpm install -D speed-measure-webpack-plugin
	
2、使用
	const SpeedMeasurePlugin=require('speed-measure-webpack-plugin')
	
	const smp = new SpeedMeasurePlugin();
	smp.wrap({配置config})

效果图:
在这里插入图片描述
代码示例:

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const HTMLInlineCSSWebpackPlugin = require ( "html-inline-css-webpack-plugin" ). default ;
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const HtmlWebpackExternalsPlugin = require('html-webpack-externals-plugin')
const FriendlyErrorsWebpackPlugin = require('friendly-errors-webpack-plugin');
const glob = require('glob');
const fs = require('fs');
const TerserPlugin = require("terser-webpack-plugin");
const SpeedMeasurePlugin=require('speed-measure-webpack-plugin')

const smp = new SpeedMeasurePlugin();

const setOptions = ()=>{
  const entry = {};
  const htmlWebpackPlugin = [];

  const entryFiles = glob.sync(path.resolve(__dirname, './src/*/index.js'))
  const fileReg = /src\/(.*)\/index\.js/;

  entryFiles.forEach((filePath, index) => {
    const fileName = filePath.match(fileReg);
    
    entry[fileName[1]] = filePath;
    htmlWebpackPlugin.push(
      new HtmlWebpackPlugin({
        template: `./src/${fileName[1]}/index.html`,
        filename:fileName[1]+'.html',
        chunks:[fileName[1]]
      })
    )
  })

  return {
    entry,
    htmlWebpackPlugin
  }
}

module.exports =smp.wrap( {
  entry: setOptions().entry,
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: '[name]_[chunkhash:8].js'
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        use:['babel-loader']
      },
      {
        test: /\.css$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          {
            loader: "postcss-loader",
            options: {
              postcssOptions: {
                plugins: [
                  [
                    "autoprefixer",
                    {
                      overrideBrowserslist: [
                          "Android 4.1",
                          "iOS 7.1",
                          "Chrome > 31",
                          "ff > 31",
                          "ie >= 8",
                          "> 1%", // 必须大于 1% 用户使用的浏览器
                          //'last 2 versions', // 所有主流浏览器最近的 2个版本
                      ],
                    },
                  ],
                ],
              },
            },
          },
          {
            loader: 'px2rem-loader',
            options: {
              remUnit: 75, //初始稿的10分之一,代表设计稿为750,1rem=75px,
              remPrecision:8,  //精确的小数点位数
            }
          }
        ]
      },
      {
        test: /\.txt$/i,
        use: [
          {
            loader: 'raw-loader',
            options: {
              esModule: false,
            },
          },
        ],
      }
    ]
  },
  optimization: {
    splitChunks: {
      cacheGroups: {
        commons: {
          test: /(react)|(react-dom)/,
          chunks: 'all',
          name: 'hhh',
          
        }
      }
    }
  },
  mode: "production",
  plugins: [
    ...setOptions().htmlWebpackPlugin,
    new MiniCssExtractPlugin({ filename: 'css/build.css' }),
    new HTMLInlineCSSWebpackPlugin(),
    // new FriendlyErrorsWebpackPlugin(),
    new CleanWebpackPlugin(),
    function () {
      this.hooks.done.tap("done", (stats) => {
        if (stats.compilation.errors && stats.compilation.errors.length && process.argv.indexOf('--watch') == -1) {
          console.log('build error');
          process.exit(1);
        }
      })
    }
  ]
})