vuecli2.x webpack3.x升级webpack5.37.0

随着项目的页面越来越多体积越来越大，dev构建速度和pro打包速度越来越慢，然后就抽时间对项目进行了webpack升级来提升一下速度
升级过程中遇到了很多的坑，基本都是plugin和loader升级后的一些用法问题，花了一个晚上和一个上午时间，过程很痛苦，但是看到
速度的大幅度提示，还是很开心的
先上图看一下对比效果
webpack3 dev构建

webpack3 pro打包

webpack5 dev构建 提升60%

webpack5 pro 构建 提升61%

看的处理效果还是很不错的

1.首先是对webpack进行升级，升级后的版本如图

升级后一些用法发生了改变
webpack-merge的变化

dev启动命令变化

2.由于wepback的升级造成了其他一些插件或者loader的不能正常使用，索性使用yarn upgrade-interactive --latest升级了所有的依赖包
3.升级后报错babel-core6.x的版本需要使用babel-loader7的版本然后重新安装yarn add -D babel-loader@7
4.安装mini-css-extract-plugin替换extract-text-webpack-plugin
webpack.base.config.js

'use strict'
const path = require('path')
const utils = require('./utils')
const config = require('../config')
const { VueLoaderPlugin } = require('vue-loader')

function resolve(dir) {
    return path.join(__dirname, '..', dir)
}



module.exports = {
    devtool:'eval-source-map',
    context: path.resolve(__dirname, '../'),
    entry: {
        app: './src/main.js'
    },
    output: {
        path: config.build.assetsRoot,
        filename: '[name].js',
        publicPath: process.env.NODE_ENV === 'production' ?
            config.build.assetsPublicPath : config.dev.assetsPublicPath
    },
    resolve: {
        extensions: ['.js', '.vue', '.json'],
        alias: {
            'vue$': 'vue/dist/vue.esm.js',
            '@': resolve('src'),
        }
    },
    module: {
        rules: [{
            test: /.vue$/,
            use: {
                loader: 'vue-loader'
            }
        },
        {
            test: /.js$/,
            use: {
                loader: 'babel-loader'
            },
            exclude: resolve('node_modules'),
            include: resolve('src')
        },
        {
            test: /.(png|jpe?g|gif|svg)(?.*)?$/,
            type: 'asset',
            parser: {
                dataUrlCondition: {
                    maxSize: 10 * 1024 // 10kb
                }
            },
            generator: {
                filename: utils.assetsPath('img/[name].[hash:7].[ext]')
            }
        },
        {
            test: /.(mp4|webm|ogg|mp3|wav|flac|aac)(?.*)?$/,
            loader: 'url-loader',
            options: {
                limit: 10000,
                name: utils.assetsPath('media/[name].[hash:7].[ext]')
            }
        },
        {
            test: /.(woff2?|eot|ttf|otf)(?.*)?$/,
            loader: 'url-loader',
            options: {
                limit: 10000,
                name: utils.assetsPath('fonts/[name].[hash:7].[ext]'),
                publicPath: '../../'
            }
        }]
    },
    node: {
        global: false
    },
    plugins: [
        new VueLoaderPlugin()
    ]
}

utils.js

'use strict'
const path = require('path')
const config = require('../config')
const MiniCssExtractPlugin = require("mini-css-extract-plugin")
const packageConfig = require('../package.json')

exports.assetsPath = function (_path) {
  const assetsSubDirectory = process.env.NODE_ENV === 'production'
    ? config.build.assetsSubDirectory
    : config.dev.assetsSubDirectory

  return path.posix.join(assetsSubDirectory, _path)
}

exports.cssLoaders = function (options) {
  options = options || {}

  const cssLoader = {
    loader: 'css-loader',
    options: {
      sourceMap: options.sourceMap
    }
  }

  const postcssLoader = {
    loader: 'postcss-loader',
    options: {
      sourceMap: options.sourceMap
    }
  }

  // generate loader string to be used with extract text plugin
  function generateLoaders(loader, loaderOptions) {
    const loaders = options.usePostCSS ? [cssLoader, postcssLoader] : [cssLoader]

    if (loader) {
      loaders.push({
        loader: loader + '-loader',
        options: Object.assign({}, loaderOptions, {
          sourceMap: options.sourceMap
        })
      })
    }

    // Extract CSS when that option is specified
    // (which is the case during production build)
    if (options.extract) {
      return [
        {
          loader: MiniCssExtractPlugin.loader,
          options: {
            publicPath: '../../' //修改路径处理图片路径错误
          }
        }
      ].concat(loaders)
    } else {
      return [
        {
          loader: 'vue-style-loader'
        }
      ].concat(loaders)
    }
  }

  // https://vue-loader.vuejs.org/en/configurations/extract-css.html
  return {
    css: generateLoaders(),
    postcss: generateLoaders(),
    less: generateLoaders('less'),
    // sass: generateLoaders('sass', { indentedSyntax: true }),
    // scss: generateLoaders('sass'),
    // stylus: generateLoaders('stylus'),
    // styl: generateLoaders('stylus')
  }
}

// Generate loaders for standalone style files (outside of .vue)
exports.styleLoaders = function (options) {
  const output = []
  const loaders = exports.cssLoaders(options)

  for (const extension in loaders) {
    const loader = loaders[extension]
    output.push({
      test: new RegExp('\.' + extension + '$'),
      use: loader
    })
  }

  return output
}

exports.createNotifierCallback = () => {
  const notifier = require('node-notifier')

  return (severity, errors) => {
    if (severity !== 'error') return

    const error = errors[0]
    const filename = error.file && error.file.split('!').pop()

    notifier.notify({
      title: packageConfig.name,
      message: severity + ': ' + error.name,
      subtitle: filename || '',
      icon: path.join(__dirname, 'logo.png')
    })
  }
}

webpack.dev.conf.js

'use strict'
const utils = require('./utils')
const webpack = require('webpack')
const config = require('../config')
const { merge } = require('webpack-merge')
const path = require('path')
const baseWebpackConfig = require('./webpack.base.conf')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const FriendlyErrorsPlugin = require('friendly-errors-webpack-plugin')
const portfinder = require('portfinder')

const HOST = process.env.HOST
const PORT = process.env.PORT && Number(process.env.PORT)

const devWebpackConfig = merge(baseWebpackConfig, {
	mode: 'development',
	module: {
		rules: utils.styleLoaders({ sourceMap: config.dev.cssSourceMap, usePostCSS: true })
	},
	// cheap-module-eval-source-map is faster for development
	devtool: config.dev.devtool,

	// these devServer options should be customized in /config/index.js
	devServer: {
		clientLogLevel: 'warning',
		historyApiFallback: {
			rewrites: [
				{ from: /.*/, to: path.posix.join(config.dev.assetsPublicPath, 'index.html') },
			],
		},
		hot: true,
		contentBase: false, // since we use CopyWebpackPlugin.
		compress: true,
		host: HOST || config.dev.host,
		port: PORT || config.dev.port,
		open: config.dev.autoOpenBrowser,
		overlay: config.dev.errorOverlay ? { warnings: false, errors: true } : false,
		publicPath: config.dev.assetsPublicPath,
		proxy: config.dev.proxyTable,
		quiet: true, // necessary for FriendlyErrorsPlugin
		watchOptions: {
			poll: config.dev.poll,
		}
	},
	plugins: [
		new webpack.DefinePlugin({
			'process.env': require('../config/dev.env'),
			BASEURL: '"//test.com"', 
		}),
		new webpack.HotModuleReplacementPlugin(),
		// new webpack.NamedModulesPlugin(), // HMR shows correct file names in console on update.
		// new webpack.NoEmitOnErrorsPlugin(),
		// https://github.com/ampedandwired/html-webpack-plugin
		new HtmlWebpackPlugin({
			filename: 'index.html',
			template: 'index.html',
			inject: true,
			chunkSortMode: 'auto'
		}),
		// copy custom static assets
		new CopyWebpackPlugin({
			patterns: [
				{
					from: path.resolve(__dirname, '../static'),
					to: config.dev.assetsSubDirectory,
					globOptions: {
						dot: true,
						gitignore: true,
						ignore: ['.*'],
					}
				},
			]
		})
	]
})

module.exports = new Promise((resolve, reject) => {
	portfinder.basePort = process.env.PORT || config.dev.port
	portfinder.getPort((err, port) => {
		if (err) {
			reject(err)
		} else {
			// publish the new Port, necessary for e2e tests
			process.env.PORT = port
			// add port to devServer config
			devWebpackConfig.devServer.port = port

			// Add FriendlyErrorsPlugin
			devWebpackConfig.plugins.push(new FriendlyErrorsPlugin({
				compilationSuccessInfo: {
					messages: [`Your application is running here: http://${devWebpackConfig.devServer.host}:${port}`],
				},
				onErrors: config.dev.notifyOnErrors ?
					utils.createNotifierCallback() : undefined
			}))

			resolve(devWebpackConfig)
		}
	})
})

webpack.prod.conf.js

'use strict'
const path = require('path')
const utils = require('./utils')
const webpack = require('webpack')
const config = require('../config')
const { merge } = require('webpack-merge')
const baseWebpackConfig = require('./webpack.base.conf')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const MiniCssExtractPlugin = require("mini-css-extract-plugin")
const TerserWebpackPlugin = require('terser-webpack-plugin')
const OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin')

const env = require('../config/prod.env')
let envOptions = {}
if (process.env.BUILD_ENV === "production") {
  envOptions = {
    'BASEURL': '"//test.com"',
  }
} else {
  envOptions = {
    'BASEURL': '"//test.com"',  
  }
}

const webpackConfig = merge(baseWebpackConfig, {
  mode: 'production',
  module: {
    rules: utils.styleLoaders({
      sourceMap: config.build.productionSourceMap,
      extract: true,
      usePostCSS: true
    })
  },
  devtool: config.build.productionSourceMap ? config.build.devtool : false,
  output: {
    path: config.build.assetsRoot,
    filename: utils.assetsPath('js/[name].[hash:7].js'),
    chunkFilename: utils.assetsPath('js/[name].[hash:7].js'),
    clean: true
  },

  optimization: {
    minimize: true,
    minimizer: [
      new TerserWebpackPlugin(),
      new OptimizeCSSPlugin(),
    ],
    runtimeChunk: { name: 'runtime' },
    concatenateModules: true,
    splitChunks: {
      cacheGroups: {
        vendor: {
          test: /[\/]node_modules[\/]/,
          name: 'vendor',
          chunks: 'all',
          priority: -10
        },
        'async-vendors': {
          test: /[\/]node_modules[\/]/,
          minChunks: 2,
          chunks: 'async',
          name: 'async-vendors'
        }
      },
    },
    moduleIds: 'deterministic'
  },
  plugins: [
    // http://vuejs.github.io/vue-loader/en/workflow/production.html
    new webpack.DefinePlugin({
      'process.env': env,
      ...envOptions,
    }),
    new MiniCssExtractPlugin({
      filename: utils.assetsPath('css/[name].[contenthash].css'),
      chunkFilename: utils.assetsPath('css/[name].[contenthash].css')
    }),
    new HtmlWebpackPlugin({
      filename: config.build.index,
      template: 'index.html',
      inject: true,
      scriptLoading: 'blocking',
      minify: {
        removeComments: true,
        collapseWhitespace: true,
        removeAttributeQuotes: true
      },
      chunksSortMode: 'auto'
    }),
    new CopyWebpackPlugin({
      patterns: [
        {
          from: path.resolve(__dirname, '../static'),
          to: config.build.assetsSubDirectory,
          globOptions: {
            dot: true,
            gitignore: true,
            ignore: ['.*'],
          }
        },
      ]
    })
  ]
})

if (config.build.productionGzip) {
  const CompressionWebpackPlugin = require('compression-webpack-plugin');
  webpackConfig.plugins.push(
    new CompressionWebpackPlugin({
      filename: '[path][base].gz[query]',
      algorithm: 'gzip',
      test: /.(js|css|json|txt|html|ico|svg)(?.*)?$/i,
      threshold: 10240,
      minRatio: 0.8,
      deleteOriginalAssets: false//保留源文件
    })
  )
}

if (config.build.bundleAnalyzerReport) {
  const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin
  webpackConfig.plugins.push(new BundleAnalyzerPlugin())
}

module.exports = webpackConfig