webpack.prod.js

const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const webpack = require('webpack')
const DuplicatePackageCheckerPlugin = require('duplicate-package-checker-webpack-plugin')

module.exports = {
  mode: 'production',
  entry: './src/index.jsx',
  output: {
    path: path.join(__dirname, 'public'),
    filename: '[name].bundle.js'
  },
  optimization: {
    splitChunks: {
      cacheGroups: {
        commons: {
          test: /[\\/]node_modules[\\/]/,
          name: 'vendors',
          chunks: 'all'
        }
      }
    }
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader'
        }
      },
      {
        test: /\.s?css$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[name].css'
            }
          },
          {
            loader: 'extract-loader'
          },
          {
            loader: 'css-loader'
          },
          {
            loader: 'sass-loader'
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html'
    }),
    new webpack.ExternalsPlugin('commonjs', ['electron']),
    new DuplicatePackageCheckerPlugin()
  ]
}