'use strict'
const path = require('path')
function resolve (dir) {
    return path.join(__dirname, dir)
}

const port = process.env.port || process.env.npm_config_port || 8888 // dev port

// 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
     */
    //  加载资源的路径
    publicPath: '/dj/',
    // 设置项目打包生成的文件的存储目录，可以是静态路径也可以是相对路径
    outputDir: 'dist',
    // 设置放置打包生成的静态资源 (js、css、img、fonts) 的目录
    assetsDir: 'static',
    lintOnSave: process.env.NODE_ENV === 'development',
    productionSourceMap: false,
    filenameHashing: false,
    // webpack开发服务器
    devServer: {
        hot: true,
        port: port,
        open: true,
        disableHostCheck: true,
        host: "0.0.0.0",
        overlay: {
            warnings: false,
            errors: true
        },
        proxy: {
            '/api': {
                target: process.env.VUE_APP_API_BASE_URL,//本机服务
                changeOrigin: true,
                pathRewrite: {
                    '^/api': ''
                }
            }
        }
    },
    css: {
        extract: false, // 是否使用css分离插件 ExtractTextPlugin
        sourceMap: false, // 开启 CSS source maps?
        loaderOptions: {
            sass: {
                prependData: `@import "@/styles/variables.scss";`
            }
        },
        modules: false,
    },
    // configureWebpack通过操作对象的形式，来修改默认的webpack配置
    configureWebpack: {
        entry: {
            app: './src/main.js'
        },
        resolve: {
            alias: {
                '@': resolve('src')
            }
        },
        devtool: process.env.NODE_ENV === 'development' ? '#eval-source-map' : false
    },
    // chainWebpack通过链式编程的形式，来修改默认的webpack配置
    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$/],
                include: 'initial'
            }
        ])
        // when there are many pages, it will cause too many meaningscss requests
        config.plugins.delete('prefetch')
        config.module
            .rule('svg')
            .exclude.add(resolve('src/image/icons'))
            .end()
        config.module
            .rule('icons')
            .test(/\.svg$/)
            .include.add(resolve('src/image/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'
                                },
                                elementUI: {
                                    name: 'chunk-elementUI',
                                    priority: 20,
                                    test: /[\\/]node_modules[\\/]_?element-ui(.*)/
                                },
                                commons: {
                                    name: 'chunk-commons',
                                    test: resolve('src/components'),
                                    minChunks: 3,
                                    priority: 5,
                                    reuseExistingChunk: true
                                }
                            }
                        })
                    config.optimization.runtimeChunk('single')
                }
            )
    }
}