const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");//将CSS代码提取为独立文件的插件
const OptimizeCssAssetsPlugin = require("optimize-css-assets-webpack-plugin");//CSS模块资源优化插件

const path = require('path');
module.exports = {
  entry: './src/index.tsx',
  mode: 'development',
  resolve: {
    extensions: ['.ts', '.tsx', '.js', '.json']
  },
  output: {
    path: path.join(__dirname, '/dist'),
    filename: 'bundle.min.js'
  },
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        use: [
          'ts-loader'
        ]
      },
      {
        test: /\.scss?$/,
        use: [
          // 'style-loader',
          {
            loader: MiniCssExtractPlugin.loader//建议生产环境采用此方式解耦CSS文件与js文件
          },
          {
            loader: 'css-loader',
            options: { importLoaders: 2 }
          },
          "postcss-loader",
          'sass-loader',
          {
            loader: 'sass-resources-loader',
            options: { resources: './src/styles/resources.scss' }
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "./src/index.html"
    }),
    new MiniCssExtractPlugin({
      filename: "[name].css"
    }) //为抽取出的独立的CSS文件设置配置参数
  ],
  optimization: {
    //对生成的CSS文件进行代码压缩 mode='production'时生效
    minimizer: [
      new OptimizeCssAssetsPlugin()
    ]
  }
};