'use strict'

const path = require('path')

function resolve(dir) {
    return path.join(__dirname, dir)
}
module.exports = {
    // 基础配置 详情看文档
    publicPath: './',
    outputDir: 'dist',
    assetsDir: 'static',
    lintOnSave: process.env.NODE_ENV === 'development',
    productionSourceMap: false,
    devServer: {
        port: 8080,
        open: true,
        overlay: {
            warnings: false,
            errors: true
        },
        proxy: {
            // 把key的路径代理到target位置
            // detail: https://cli.vuejs.org/config/#devserver-proxy
            [process.env.VUE_APP_BASE_API]: { //需要代理的路径   例如 '/api'
                target: `http://127.0.0.1:8888/`, //代理到 目标路径
                changeOrigin: true,
                pathRewrite: { // 修改路径数据
                    ['^' + process.env.VUE_APP_BASE_API]: '' // 举例 '^/api:""' 把路径中的/api字符串删除
                }
            }
        },
    },
    configureWebpack: {
        //    @路径走src文件夹
        resolve: {
            alias: {
                '@': resolve('src')
            }
        }
    },
    chainWebpack(config) {
        // set preserveWhitespace
        config.module
            .rule('vue')
            .use('vue-loader')
            .loader('vue-loader')
            .tap(options => {
                options.compilerOptions.preserveWhitespace = true
                return options
            })
            .end()
        config
        // https://webpack.js.org/configuration/devtool/#development
            .when(process.env.NODE_ENV === 'development',
            config => config.devtool('cheap-source-map')
        )

        config
            .when(process.env.NODE_ENV !== 'development',
                config => {

                    // 不打包 begin
                    // 1.目前已经测试通过[vue,axios,echarts]可以cdn引用，其它组件测试通过后可继续添加
                    // 2.此处添加不打包后，需在public/index.html head中添加相应cdn资源链接
                    config.set('externals', {
                        vue: 'Vue',
                        axios: 'axios',
                        echarts: 'echarts'
                    })
                    // 不打包 end

                    config
                        .plugin('ScriptExtHtmlWebpackPlugin')
                        .after('html')
                        .use('script-ext-html-webpack-plugin', [{
                            // `runtime` must same as runtimeChunk name. default is `runtime`
                            inline: /single\..*\.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
                                }
                            }
                        })
                    config.optimization.runtimeChunk('single')
                }
            )
    }
}