webpack中的optimization怎么配置

本篇内容主要讲解“webpack中的optimization怎么配置”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“webpack中的optimization怎么配置”吧!

webpack配置optimization

• minimizer

• runtimeChunk

• noEmitOnErrors

• splitChunks

主要就是根据不同的策略来分割打包出来的bundle。

本人项目中splitChunks配置如下：

module.exports = {
                    chainWebpack(config) {
                        config.when(process.env.NODE_ENV != 'development',
                            config => {
                                config.optimization.splitChunks({
                                    chunks: 'all',
                                    cacheGroups: {
                                        // 第三方组件
                                        libs: {
                                            指定chunks名称
                                            name: 'chunk-libs',
                                            //符合组的要求就给构建venders
                                            test: /[\\/]node_modules[\\/]/,
                                            //priority:优先级：数字越大优先级越高，因为默认值为0，所以自定义的一般是负数形式,决定cacheGroups中相同条件下每个组执行的优先顺序。
                                            priority: 10,
                                            // 仅限于最初依赖的第三方
                                            chunks: 'initial'
                                        },
                                        elementUI: {
                                            // 将elementUI拆分为单个包
                                            name: 'chunk-elementUI',
                                            // 重量需要大于libs和app，否则将打包到libs或app中
                                            priority: 20,
                                            // 为了适应cnpm
                                            test: /[\\/]node_modules[\\/]_?element-ui(.*)/
                                        },
                                        //公共组件
                                        commons: {
                                            name: 'chunk-commons',
                                            // can customize your rules
                                            test: resolve('src/components'),
                                            minChunks: 3,
                                            priority: 30,
                                            //这个的作用是当前的chunk如果包含了从main里面分离出来的模块，则重用这个模块，这样的问题是会影响chunk的名称。
                                            reuseExistingChunk: true,
                                            //最大初始化加载次数，一个入口文件可以并行加载的最大文件数量，默认3
                                            maxInitialRequests: 3,
                                            //表示在分离前的最小模块大小，默认为0，最小为30000
                                            minSize: 0
                                        },
                                        echarts: { // split echarts libs
                                            name: 'chunk-echarts',
                                            test: /[\\/]node_modules[\\/]_?echarts(.*)/,
                                            priority: 40,
                                            chunks: 'async',
                                            reuseExistingChunk: true
                                        },
                                        monaco: { // split monaco libs
                                            name: 'chunk-monaco',
                                            test: /[\\/]node_modules[\\/]_?monaco(.*)/,
                                            priority: 40,
                                            chunks: 'async',
                                            reuseExistingChunk: true
                                        },
                                        'project-components': { // split project libs
                                            name: 'chunk-project-components',
                                            test: resolve('src/views/project'),
                                            priority: 50,
                                            chunks: 'async',
                                            reuseExistingChunk: true
                                        },
                                        'teachers-components': { // split teacher libs
                                            name: 'chunk-teachers-components',
                                            test: resolve('src/views/teachers'),
                                            priority: 60,
                                            chunks: 'async',
                                            reuseExistingChunk: true
                                        },
                                        'utils': { // split utils libs
                                            name: 'chunk-utils',
                                            test: resolve('src/utils'),
                                            priority: 70,
                                            chunks: 'async',
                                            reuseExistingChunk: true
                                        },
                                    }
                                })
                            })

                    }
                }

分析工具：webpack-bundle-analyzer

• 安装

npm i --save-dev webpack-bundle-analyzer

• 配置

 config.plugin('BundleAnalyzerPlugin').use(BundleAnalyzerPlugin).tap(() => [
      {
        rel: 'BundleAnalyzerPlugin',
        analyzerMode: 'server', // 'server': 启动端口服务；'static': 生成 report.html；'disabled': 配合 generateStatsFile 使用；
        generateStatsFile: false, // 是否生成stats.json文件
        analyzerHost: '127.0.0.1',
        analyzerPort: '8667',
        reportFilename: 'report.html',
        defaultSizes: 'parsed',
        openAnalyzer: false,
        statsFilename: 'stats.json',
        statsOptions: null,
        excludeAssets: null
      }

运行

npm run build 或者 npm run dev

访问

http://127.0.0.1:8877

扩展：webpack中module package bundle chunk详细讲解

• module 模块 写一个commonjs 或者amd规范的包就叫module

• package 是所有module构成的，它是一个整体的概念，整个项目就是一个package，它可能是commonjs或者amd规范的包

• bundle是webpack打包的结果 所有的module都打包成一个文件 （module集合）

• chunk bundle是入口bundle,异步加载一个模块，是需要运行时去处理的，获取的过程就是一个代码块即chunk;由bundle获取的包为chunk

到此，相信大家对“webpack中的optimization怎么配置”有了更深的了解，不妨来实际操作一番吧！这里是亿速云网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！