const path = require('path');
// const webpack = require('webpack');
const UglifyPlugin = require("uglifyjs-webpack-plugin");

const IS_PROD = ["production", "prod"].includes(process.env.NODE_ENV); //env

module.exports = {
  // 基本路径
  publicPath: process.env.NODE_ENV === "production" ? process.env.BASE_URL : "./", //打包后的位置(如果不设置这个静态资源会报404),
  // 输出文件目录
  outputDir: 'docs',
  // eslint-loader 是否在保存的时候检查
  lintOnSave: true,
  // webpack配置
  // see https://github.com/vuejs/vue-cli/blob/dev/docs/webpack.md
  chainWebpack: () => { },
  configureWebpack: (config) => {
    if (IS_PROD) {
      // 为生产环境修改配置...
      config.mode = 'production';
      // 将每个依赖包打包成单独的js文件
      let optimization = {
        runtimeChunk: 'single',
        splitChunks: {
          chunks: 'all',
          maxInitialRequests: Infinity,
          minSize: 20000, // 依赖包超过20000bit将被单独打包
          cacheGroups: {
            vendor: {
              test: /[\\/]node_modules[\\/]/,
              name (module) {
                // get the name. E.g. node_modules/packageName/not/this/part.js
                // or node_modules/packageName
                const packageName = module.context.match(/[\\/]node_modules[\\/](.*?)([\\/]|$)/)[1]
                // npm package names are URL-safe, but some servers don't like @ symbols
                return `npm.${packageName.replace('@', '')}`
              }
            }
          }
        },
        minimizer: [
          new UglifyPlugin({
            uglifyOptions: {
              compress: {
                drop_console: true, // console
                drop_debugger: false,
                pure_funcs: ["console.log"] // 移除console
              }
            }
          })
        ]
      }
      Object.assign(config, {
        optimization
      })
    } else {
      // 为开发环境修改配置...
      config.mode = 'development';
    }

    Object.assign(config, {
      // 开发生产共同配置
      resolve: {
        extensions: ['.js', '.vue', '.json'],
        alias: {
          '@': path.resolve(__dirname, './src'),
          '@c': path.resolve(__dirname, './src/components')
        }
      }
    });
  },
  // 生产环境是否生成 sourceMap 文件
  productionSourceMap: false,
  // css相关配置
  css: {
    // 是否使用css分离插件 ExtractTextPlugin
    extract: true,
    // 开启 CSS source maps?
    sourceMap: !IS_PROD,
    // css预设器配置项
    loaderOptions: {},
    // 启用 CSS modules for all css / pre-processor files.
    modules: false
  },
  // use thread-loader for babel & TS in production build
  // enabled by default if the machine has more than 1 cores
  parallel: require('os').cpus().length > 1,
  // PWA 插件相关配置
  // see https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-pwa
  pwa: {},
  // webpack-dev-server 相关配置
  devServer: {
    open: process.platform === 'darwin',
    host: '0.0.0.0',
    port: 8080,
    https: false,
    hotOnly: false,
    // proxy: {
    //  设置代理
    //  proxy all requests starting with /api to jsonplaceholder
    //  'http://localhost:8080/': {
    //      target: 'http://baidu.com:8080', //真实请求的目标地址
    //      changeOrigin: true,
    //      pathRewrite: {
    //          '^http://localhost:8080/': ''
    //      }
    //  }
    // },
    // before: (app) => { }
  },
  // 第三方插件配置
  pluginOptions: {
    // ...
  }
};