const path = require('path');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const nodeExternals = require('webpack-node-externals');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
module.exports = {
  mode: 'production',
  entry: './src/kityminderEditor.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, '../dist'),
    libraryTarget: 'commonjs2',
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        use: 'babel-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
      // 抽离 less
      {
        test: /\.less$/,
        exclude: /\.module\.less$/,
        loader: [
          MiniCssExtractPlugin.loader,  // 注意，这里不再用 style-loader
          'css-loader', 
          'less-loader'
        ]
      },
      {
        test: /\.module\.less$/,
        loader: [
          'style-loader', 
          {
            loader: 'css-loader',
            options: {
              modules: {
                localIdentName: '[local]_[hash:base64:5]',
              }
            }
          },
          // 'css-loader?modules',
          'less-loader'
        ]
      },
      {
        test: /\.s[ac]ss$/i,
        use: [
          // Creates `style` nodes from JS strings
          'style-loader',
          // Translates CSS into CommonJS
          'css-loader',
          // Compiles Sass to CSS
          'sass-loader',
        ],
      },
    ],
  },
  // devtool: 'nosources-source-map',
  // devtool: 'source-map',
  devtool: 'cheap-module-source-map',
  externals: [nodeExternals()],
  plugins: [
    new CleanWebpackPlugin(),
    new UglifyJsPlugin({
      sourceMap: true,
      parallel: true,
      uglifyOptions: {
        output: {
          beautify: false, // 最紧凑的输出
          comments: false, // remove comments
        },
        compress: {
          unused: true,
          dead_code: true, // big one--strip code that will never execute
          drop_debugger: true,
          conditionals: true,
          evaluate: true,
          drop_console: false, // strips console statements
          sequences: true,
          booleans: true,
        },
        warnings: false,
      },
    }),
  ],
};