const path = require('path');
const merge = require('webpack-merge');
const baseConfig = require('./webpack.base.js'); // 引用公共的配置
const MiniCssExtractPlugin = require("mini-css-extract-plugin"); // 用于将组件的css打包成单独的文件输出到`lib`目录中
const webpack = require('webpack')

const prodConfig = {
    mode: 'production', // 开发模式
    entry: path.join(__dirname, "../src/entry.jsx"),
    output: {
        path: path.join(__dirname, "../lib/"),
        filename: "index.js",
        libraryTarget: 'umd', // 采用通用模块定义
        libraryExport: 'default', // 兼容 ES6 的模块系统、CommonJS 和 AMD 模块规范
    },
    module: {
        rules: [
            {
                test: /\.css$/,
                loader: [MiniCssExtractPlugin.loader,'css-loader?modules'],
            },
            {
                test: /\.min\.css$/,
                loader: ['style-loader','css-loader'],
            },
            {
                test: /(\.module)?.(sass|scss)$/,
                use: [
                    'style-loader',
                    {
                        loader: 'css-loader',
                        options: {
                            modules: {
                                localIdentName: '[path][name]__[local]--[hash:base64:5]',
                            },
                            sourceMap: true,
                        },
                    },
                    'sass-loader',
                ],
            },
            // {
            //     test: /\.less$/,
            //     use: [
            //         'style-loader',
            //         {
            //             loader: 'css-loader',
            //             options: {
            //                 modules: {
            //                     localIdentName: '[path][name]__[local]--[hash:base64:5]',
            //                 },
            //                 sourceMap: true,
            //             },
            //         },
            //         'less-loader',
            //     ],
            // },
            {
                test: /\.less$/,
                loader: ['style-loader','css-loader','less-loader'],
            },
            {
                test: /\.(png|svg|jpg|gif)$/,
                use: ['file-loader'],
            }
        ]
    },
    plugins: [
        new MiniCssExtractPlugin({
            filename: "main.min.css" // 提取后的css的文件名
        }),
        new webpack.ProvidePlugin({
            "React": "react",
        })
    ],
    externals: { // 定义外部依赖，避免把react和react-dom打包进去
        react: {
            root: "React",
            commonjs2: "react",
            commonjs: "react",
            amd: "react"
        },
        "react-dom": {
            root: "ReactDOM",
            commonjs2: "react-dom",
            commonjs: "react-dom",
            amd: "react-dom"
        }
    }
};

module.exports = merge(prodConfig, baseConfig); // 将baseConfig和prodConfig合并为一个配置