const path = require('path');
const nodeExternals = require('webpack-node-externals');
const { TsconfigPathsPlugin } = require('tsconfig-paths-webpack-plugin');
const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');

module.exports = {
  entry: './src/main.ts',// 入口問啊進(jìn)
  target: 'node',
  mode: process.env.NODE_ENV || 'production',
  output: {
    path: path.resolve(__dirname, 'dist'), //輸出目錄
    filename: 'bundle.js',// 輸出結(jié)果
  },
  resolve: {
    extensions: ['.ts', '.js'],// 支持的文件擴(kuò)展名
    plugins: [
      new TsconfigPathsPlugin({// 支持tsconfig路徑映射
        configFile: './tsconfig.json',
      }),
    ],
  },
  module: {
    rules: [
      {
        test: /\.ts$/, // 處理TypeScript文件
        use: {
          loader: 'ts-loader',  
          options: {
            transpileOnly: true, // 只編譯，不做類型檢查
          },
        },
        exclude: /node_modules/, //排除 node_modules
      },
    ],
  },
  externals: [nodeExternals()],  // 排除所有 node_modules 依賴;不打包 [node_modules]()，運(yùn)行時(shí)從外部加載,這就是為什么你需要在部署環(huán)境安裝依賴的原因
  plugins: [
    new CleanWebpackPlugin(), // 清理dist目錄
    new ForkTsCheckerWebpackPlugin(),// 在單獨(dú)進(jìn)程中進(jìn)行類型檢查
    new CopyPlugin({ //將靜態(tài)文件復(fù)制到dist目錄
      patterns: [
        {
          from: path.resolve(__dirname, 'public'),
          to: path.resolve(__dirname, 'dist/public'),
        },
        {
          from: path.resolve(__dirname, 'package.json'),
          to: path.resolve(__dirname, 'dist/package.json'),
        },
        {
          from: path.resolve(__dirname, '.env'),
          to: path.resolve(__dirname, 'dist'),
        },
      ],
    }),
  ],
  optimization: {
    minimize: process.env.NODE_ENV === 'production',
    minimizer: [
      new TerserPlugin({
        terserOptions: {
          compress: {
            drop_console: process.env.NODE_ENV === 'production',// 生產(chǎn)環(huán)境移除 console
          },
        },
      }),
    ],
  },
  devtool: process.env.NODE_ENV === 'production' ? 'source-map' : 'eval-cheap-module-source-map',
};