const { resolve } = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin');
// 設定nodejs環境變數 設定開發環境的配置，預設看生產環境
// process.env.NODE_ENV = 'development'

module.exports = {
  entry: ['./src/js/index.js', './src/index.html'],
  output: {
    filename: 'js/main.js',
    path: resolve(__dirname, 'build'),
    // 將某些資源傳送到指定目錄，
    assetModuleFilename: 'images/[hash:10][ext][query]',
    clean: true //每次構建前清理 /build 資料夾
  },
  module: {
    rules: [
      // 載入css
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
      // 載入less
      {
        test: /\.less$/,
        use: ['style-loader', 'css-loader', 'less-loader']
      },
      // 載入images url中的圖片資源
      {
        test: /\.(png|svg|jpg|jpeg|gif)$/,
        type: 'asset/resource'
      },
      // 將 HTML 匯出為字串，需要傳入靜態資源的引用路徑
      {
        test: /\.html$/,
        loader: 'html-loader'
      },
      // 載入其他檔案資源
      {
        exclude: /\.(js|css|less|html|jpg|png|gif)$/,
        loader: 'file-loader',
        options: {
          outputPath: 'static',
          name: '[hash:10].[ext]'
        }
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
    }),
  ],
  mode: 'development',
  devServer: {
    // 未配置埠，預設localhost:8080
    static: './build',
    // 啟動gzip壓縮
    compress: true,
    open: true,
    hot: true
  },
  devtool: 'source-map'
}