const path = require('path');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const webpack = require('webpack')

module.exports = {
  mode: 'production',
  // devtool: "source-map",
  entry: path.join(__dirname, "./src/export.js"),
  output: {
    filename: 'index.js',
    path: path.resolve(__dirname, 'lib'),
    //意思是把我们的输出作为组件，没有这个在react项目中识别不到export导出的组件
    library: {
      type: 'umd', // 以库的形式导出入口文件时，输出的类型,这里是通过umd的方式来暴露library,适用于使用方import的方式导入npm包
    }
  },
  resolve: {
    // 设置别名
    extensions: ["*", ".js", ".jsx"],// 配置会将没指定拓展名的文件按如下类型查找匹配
    alias: {
      '@': path.resolve(__dirname, 'src'),
      antd: path.resolve(__dirname, "node_modules/antd"),
    }
  },
  module: {
    rules: [
      {
        test: /\.(css|scss)$/i,
        use: ["style-loader", MiniCssExtractPlugin.loader, "css-loader", "sass-loader"],
      },
      {
        test: /\.(js|jsx)$/,
        loader: 'babel-loader',
        include: [path.resolve('src')],// 只在src文件夹下查找
        exclude: /(node_modules|dist|build|example)/
      },
      {
        test: /(\.module)?.(sass|scss)$/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              modules: {
                localIdentName: '[path][name]__[local]--[hash:base64:5]',
              },
              sourceMap: true,
            },
          },
          'sass-loader',
        ],
      },
      {
        test: /(\.module)?.(less)$/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              modules: {
                localIdentName: '[path][name]__[local]--[hash:base64:5]',
              },
              sourceMap: true,
            },
          },
          'less-loader',
        ],
      },
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "index.css" // 提取后的css的文件名
    }),
    new webpack.ProvidePlugin({
      "React": "react",
    }),
  ],
  // externalsPresets: { node: true },
  //打包时不将以下依赖打包进index.js，需要引用组件的项目提前npm好
  externals: [{
    'react': 'react',
    'react-dom': 'react-dom',
  },
  ]
}