记一次webpack3升级webpack4的踩坑

webpack4版本也出了很久了 之前弄过一段时间的升级 后面因为种种原因搁浅了 今天有硬着头皮升级了一波 yeah 还好升级成功了 

先贴一波原先webpack3的github配置 

ps(我只是一个菜鸡= = webpack的配置很辣鸡 )废话少说 开撸

1 webpack升级到4.0版本并且安装webpack-cli

  

yarn add webpack-cli global
yarn add webpack-cli -D

  如果不对webpack-cli进行安装的话会报错 如下:

The CLI moved into a separate package:webpack-cli.
Please install 'webpack-cli' in addition to webpack itself to use the CLI.
->when using npm: npm install webpack-cli -D
->when using yarn: yarn add webpack-cli -D

2 对一些包的相关依赖

  继续yarn run dev  yeah!!! 报错了

Error: Cannot find module 'webpack/bin/config-yargs'
    at Function.Module._resolveFilename (module.js:538:15)
    at Function.Module._load (module.js:468:25)
    at Module.require (module.js:587:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (C:\Users\hboxs022\Desktop\webpack-demo\webpack-demo\node_modules\webpack-dev-server\bin\webpack-dev-server.js:54:1)
    at Module._compile (module.js:643:30)
    at Object.Module._extensions..js (module.js:654:10)
    at Module.load (module.js:556:32)
    at tryModuleLoad (module.js:499:12)
    at Function.Module._load (module.js:491:3)
error Command failed with exit code 1.

 解决办法:这个就是目前版本的webpack-dev-server不支持webpack4 升级一波

  

yarn add webpack-dev-server@3.1.1 -D //我装的是3.1.1的包

  不过看了挺多资料 只要webpack-dev-server是3.0版本以上好像就兼容 大雾 反正我是3.0.0-alpha6通过了

3 去除commonchunk plugin 改用 webpack.optimize.SplitChunksPlugin

再一次执行yarn run dev 然后又出错了 心里一万个奔腾的野马 没办法啊 硬着头皮看呗

出错原因 

Error: webpack.optimize.CommonsChunkPlugin has been removed, please use config.optimization.splitChunks instead.

  webpack4废除了很多api 之前配置拆分公共代码 打包第三方库贼麻烦 然后官方一不做二不休直接废除了之前的又捣鼓了这个webpack.optimize.SplitChunksPlugin

  然后关于这个插件的使用我也是弄了很久后面跑去官方的example里面去看了一下才有所头绪,如果你之前大致了解原来的commonchunk plugin 直接去看官方的例子你就懂了 这里贴一下官方的example链接,其中最重要的就是关于如何打包多文件入口的common-chunk-add-vendor-chunk例子,不多说放链接 直接明了的告诉你如何拆分公用代码以及第三方库。

  至于打包runtime代码 webpack4直接调用新的方法 ok 完事

  

        new webpack.optimize.RuntimeChunkPlugin({
            name: "manifest"
        }),

 

  关于webpack.optimize.SplitChunksPlugin的详细用法 我也贴出来 有兴趣的同学可以自己琢磨

                new webpack.optimize.SplitChunksPlugin({
                    chunks: "initial", // 必须三选一: "initial" | "all"(默认就是all) | "async"
                    minSize: 0, // 最小尺寸,默认0
                    minChunks: 1, // 最小 chunk ,默认1
                    maxAsyncRequests: 1, // 最大异步请求数, 默认1
                    maxInitialRequests: 1, // 最大初始化请求书,默认1
                    name: function () {
                    }, // 名称,此选项可接收 function
                    cacheGroups: { // 这里开始设置缓存的 chunks
                        priority: 0, // 缓存组优先级
                        vendor: { // key 为entry中定义的 入口名称
                            chunks: "initial", // 必须三选一: "initial" | "all" | "async"(默认就是异步)
                            name: "vendor", // 要缓存的 分隔出来的 chunk 名称
                            minSize: 0,
                            minChunks: 1,
                            enforce: true,
                            maxAsyncRequests: 1, // 最大异步请求数, 默认1
                            maxInitialRequests: 1, // 最大初始化请求书,默认1
                            reuseExistingChunk: true // 可设置是否重用该chunk(查看源码没有发现默认值)
                        }
                    }
                }),

  最后贴上修改后的webpack.optimize.SplitChunksPlugin的代码

        new webpack.optimize.SplitChunksPlugin({
            cacheGroups: {
                default: {
                    minChunks: 2,
                    priority: -20,
                    reuseExistingChunk: true,
                },
                //打包重复出现的代码
                vendor: {
                    chunks: 'initial',
                    minChunks: 2,
                    maxInitialRequests: 5, // The default limit is too small to showcase the effect
                    minSize: 0, // This is example is too small to create commons chunks
                    name: 'vendor'
                },
                //打包第三方类库
                commons: {
                    name: "commons",
                    chunks: "initial",
                    minChunks: Infinity
                }
            }
        }),

        new webpack.optimize.RuntimeChunkPlugin({
            name: "manifest"
        }),

4 升级happypack插件!!!!!

  至于为啥用红字 如果使用了happypack进行多线程加速打包的小伙伴们千万要记住升级happypack 因为我卡在这里开了很久后面看了别人的配置才知道happypack也不兼容需要进行升级 泪奔。。。。贴一下当时的错误提示

TypeError: Cannot read property 'length' of undefined 
    at resolveLoader (C:\Users\hboxs022\Desktop\webpack-demo\webpack-demo\node_modules\happypack\lib\WebpackUtils.js:138:17)
    at C:\Users\hboxs022\Desktop\webpack-demo\webpack-demo\node_modules\happypack\lib\WebpackUtils.js:126:7
    at C:\Users\hboxs022\Desktop\webpack-demo\webpack-demo\node_modules\happypack\node_modules\async\lib\async.js:713:13

 解决办法:升级呗

  

yarn add happypack@next -D

 5 剩下的问题大部分都是因为当前的包与webpack4不兼容 这里就直接贴出来了

  

  var outputName = compilation.mainTemplate.applyPluginsWaterfall('asset-path', outputOptions.filename, {
                                                  ^

TypeError: compilation.mainTemplate.applyPluginsWaterfall is not a function
    at C:\Users\hboxs022\Desktop\webpack-demo\webpack-demo\node_modules\html-webpack-plugin\lib\compiler.js:81:51
    at compile (C:\Users\hboxs022\Desktop\webpack-demo\webpack-demo\node_modules\webpack\lib\Compiler.js:240:11)
    at hooks.afterCompile.callAsync.err (C:\Users\hboxs022\Desktop\webpack-demo\webpack-demo\node_modules\webpack\lib\Compiler.js:488:14)

 解决办法:升级html-webpack-plugin 

 

1 yarn add webpack-contrib/html-webpack-plugin -D

最后 extract-text-webpack-plugin和sass-loader也需要进行升级 具体我会在最后贴出我的webpack4 demo 大家看着安装哈

6 最后 配置完成测试一哈

  

开发环境下

 yarn run start  ok 效果没问题 看一下构建时间 9891ms 对比图中的webpack3 17161ms

:\Users\hboxs022\Desktop\webpack4>yarn run dev
yarn run v1.3.2
$ set NODE_ENV=dev && webpack-dev-server
Happy[js]: Version: 5.0.0-beta.3. Threads: 6 (shared pool)
(node:2060) DeprecationWarning: Tapable.plugin is deprecated. Use new API on `.hooks` instead
i 「wds」: Project is running at http://localhost:8072/
i 「wds」: webpack output is served from /
i 「wds」: Content not from webpack is served from C:\Users\hboxs022\Desktop\webpack4\src
Happy[js]: All set; signaling webpack to proceed.
Happy[css]: Version: 5.0.0-beta.3. Threads: 6 (shared pool)
Happy[css]: All set; signaling webpack to proceed.
(node:2060) DeprecationWarning: Tapable.apply is deprecated. Call apply on the plugin directly instead
i 「wdm」: wait until bundle finished: /page/index.html
i 「wdm」: Hash: 1911cfc871cd5dc27aca
Version: webpack 4.1.1
Time: 9891ms
Built at: 2018-3-28 18:49:25

 

  

生产环境下

yarn run build

ok 第三方库jquery打包到common里了 公共js代码打包进vendor 公共样式也打包进ventor后面分离成vendor.css

目录结构也没问题 模块id也进行了固定

 

 下面再来看看速度对比

webpack3

webpack4 是我错觉吗= =

 

最后贴上webpack4的github链接 有帮助的话帮忙点个star吧= = 我第一次写博客 瑟瑟发抖

 

posted @ 2018-03-28 19:12  carrot萝卜  阅读(30434)  评论(7编辑  收藏