const path = require('path');
const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
const TerserPlugin = require('terser-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');

module.exports = {
  entry: './src/index.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'readability.min.js',
    library: 'ReadabilityBundle',
    libraryTarget: 'umd',
    globalObject: 'this'
  },
  mode: 'production',
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env']
          }
        }
      }
    ]
  },
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: false
      })
    ],
    usedExports: true,
    sideEffects: true
  },
  plugins: [
    new CleanWebpackPlugin(),
    new BundleAnalyzerPlugin({
      analyzerMode: 'static',
      openAnalyzer: false,
      generateStatsFile: true,
      statsOptions: { source: false }
    })
  ]
};