vue.config.js解释

'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')
const localConf = require('./localConf');

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

const name = defaultSettings.title // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 9528 // dev port
// const isYapi = true
// const proxyUrl = 'http://10.35.224.57/'
// const proxyUrl = 'http://10.35.210.133/'
// const proxyUrl = 'http://10.35.210.169/'
const proxyUrl = localConf.proxyUrl
// const proxyUrl = 'http://10.34.27.27:8080'

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
    /**
     * You will need to set publicPath if you plan to deploy your site under a sub path,
     * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
     * then publicPath should be set to "/bar/".
     * In most cases please use '/' !!!
     * Detail: https://cli.vuejs.org/config/#publicpath
     */
    publicPath: process.env.NODE_ENV === 'production'
    ? '/Watchman/'
    : '/',
    outputDir: 'dist',
    assetsDir: 'static',
    // lintOnSave: process.env.NODE_ENV === 'development',
    lintOnSave: false,
    productionSourceMap: process.env.ENV === 'test' ? true : false,
    devServer: {
        port: port,
        open: true,
        overlay: {
            warnings: false,
            errors: true
        },
        proxy: {
            // '/Watchman': {
            //     target: proxyUrl,
            //     changeOrigin: true,
            //     secure: false,
            //     pathRewrite: {
            //         '^/Watchman': '/'
            //     }
            // },
            '/': {
                target: proxyUrl,
                changeOrigin: true,
                secure: false
            },
        }
    },
    configureWebpack: config => {
        // provide the app's title in webpack's name field, so that
        // it can be accessed in index.html to inject the correct title.

        // 执行npm run build会去掉console,debugger,warnings
        // 执行npm run build:test 会保留console,debugger,warnings
        if (process.env.NODE_ENV === 'production' && process.env.ENV !== 'test') {
            config.optimization.minimizer[0].options.terserOptions.compress.warnings = false
            config.optimization.minimizer[0].options.terserOptions.compress.drop_console = true
            config.optimization.minimizer[0].options.terserOptions.compress.drop_debugger = true
            config.optimization.minimizer[0].options.terserOptions.compress.pure_funcs = ['console.log']
        } else {
            config.devtool = 'source-map'
        }
        config.name = name,
        Object.assign(config.resolve, {
            alias: {
                '@': resolve('src'),
                '#': resolve('/'),
                api: resolve('src/api'),
                utils: resolve('src/utils')
            }
        })
    },
    chainWebpack(config) {
        // it can improve the speed of the first screen, it is recommended to turn on preload
        config.plugin('preload').tap(() => [
            {
                rel: 'preload',
                // to ignore runtime.js
                // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
                fileBlacklist: [
                    /\.map$/,
                    /hot-update\.js$/,
                    /runtime\..*\.js$/
                ],
                include: 'initial'
            }
        ])

        // when there are many pages, it will cause too many meaningless requests
        config.plugins.delete('prefetch')

        // set svg-sprite-loader
        config.module
            .rule('svg')
            .exclude.add(resolve('src/icons'))
            .end()
        config.module
            .rule('icons')
            .test(/\.svg$/)
            .include.add(resolve('src/icons'))
            .end()
            .use('svg-sprite-loader')
            .loader('svg-sprite-loader')
            .options({
                symbolId: 'icon-[name]'
            })
            .end()

        config.when(process.env.NODE_ENV !== 'development', config => {
            config
                .plugin('ScriptExtHtmlWebpackPlugin')
                .after('html')
                .use('script-ext-html-webpack-plugin', [
                    {
                        // `runtime` must same as runtimeChunk name. default is `runtime`
                        inline: /runtime\..*\.js$/
                    }
                ])
                .end()
            config.optimization.splitChunks({
                chunks: 'all',
                cacheGroups: {
                    libs: {
                        name: 'chunk-libs',
                        test: /[\\/]node_modules[\\/]/,
                        priority: 10,
                        chunks: 'initial' // only package third parties that are initially dependent
                    },
                    elementUI: {
                        name: 'chunk-elementUI', // split elementUI into a single package
                        priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                        test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm`
                    },
                    commons: {
                        name: 'chunk-commons',
                        test: resolve('src/components'), // can customize your rules
                        minChunks: 3, //  minimum common number
                        priority: 5,
                        reuseExistingChunk: true
                    }
                }
            })
            // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
            config.optimization.runtimeChunk('single')
        })
    }
}