const path = require('path');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');

module.exports = {
	// 基本路径
	/* 部署生产环境和开发环境下的URL：可对当前环境进行区分，baseUrl 从 Vue CLI 3.3 起已弃用，要使用publicPath */
	/* baseUrl: process.env.NODE_ENV === 'production' ? './' : '/' */
	publicPath: process.env.NODE_ENV === 'production' ? './' : './',
	// 输出文件目录
	outputDir: 'dist',
	// eslint-loader 是否在保存的时候检查
	lintOnSave: false,
	// use the full build with in-browser compiler?
	// https://vuejs.org/v2/guide/installation.html#Runtime-Compiler-vs-Runtime-only
	//   compiler: false,
	runtimeCompiler: true, //关键点在这
	// 调整内部的 webpack 配置。
	// 查阅 https://github.com/vuejs/vue-doc-zh-cn/vue-cli/webpack.md
	// webpack配置
	// see https://github.com/vuejs/vue-cli/blob/dev/docs/webpack.md

	//   //修改或新增html-webpack-plugin的值，在index.html里面能读取htmlWebpackPlugin.options.title
	//   chainWebpack: config =>{
	// 	config.plugin('html')
	// 	  .tap(args => {
	// 		  console.log('htmlhtml', args)
	// 		args[0].title = "平台";
	// 		return args;
	// 	  })
	//   },
	configureWebpack: (config) => {
		if (process.env.NODE_ENV === 'production') {
			// 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
			var 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 UglifyJsPlugin({
						uglifyOptions: {
							// 删除注释
							output: {
								comments: false
							},
							// 删除console debugger 删除警告
							compress: {
								warnings: false,
								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';
			var optimization2 = {
				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('@', '')}`;
							}
						}
					}
				}
			};
		}
		Object.assign(config, {
			// 开发生产共同配置
			// externals: {
			//   'vue': 'Vue',
			//   'element-ui': 'ELEMENT',
			//   'vue-router': 'VueRouter',
			//   'vuex': 'Vuex'
			// } // 防止将某些 import 的包(package)打包到 bundle 中，而是在运行时(runtime)再去从外部获取这些扩展依赖(用于csdn引入)
			resolve: {
				extensions: [ '.js', '.vue', '.json', '.ts' ], //文件优先解析后缀名顺序
				alias: {
					'@': path.resolve('./src')
				}, // 别名配置
				plugins: []
			},
			optimization: optimization2
		});
	},
	// vue-loader 配置项
	// https://vue-loader.vuejs.org/en/options.html
	// vueLoader: {},
	// 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, //注释css热更新生效
		// 开启 CSS source maps?
		sourceMap: false,
		// css预设器配置项
		loaderOptions: {
			less: {
				// less 全局变量
				lessOptions: {
					globalVars: {
						hack: `true; @import '~@/assets/styles/variables.less';`
					},
					javascriptEnabled: true
				}
			}
		}
		// 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,
	// 是否启用dll
	// See https://github.com/vuejs/vue-cli/blob/dev/docs/cli-service.md#dll-mode
	// dll: false,
	// 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: {
		/* 自动打开浏览器 */
		open: true,
		// host: "192.168.0.137",
		host: '0.0.0.0', //局域网和本地访问
		//host: "192.168.1.137",
		hot: true,
		port: 8888,
		https: false,
		hotOnly: false,
		before: () => {}
	},
	// 第三方插件配置
	pluginOptions: {}
};