webpack.prod.js

const merge = require('webpack-merge');
const common = require('./webpack.common.js');
const MiniCssExtractPlugin =  require('mini-css-extract-plugin');
const CopyPlugin = require('copy-webpack-plugin');

module.exports = {
  plugins: [
    new CopyPlugin([
      { from: 'source', to: 'dest' },
      { from: 'other', to: 'public' },
    ]),
  ],
};

module.exports = merge(common, {
  mode: 'production',
  module: {
    rules: [
      {
        test: /\.scss$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          'sass-loader'
        ]
      }
    ]
  },
  plugins: [
    new CopyPlugin([
      { from: './src/scripts/ar.js', to: 'scripts' },
      { from: './src/data', to: 'data' },
      { from: './src/markers', to: 'markers' },
    ]),
    new MiniCssExtractPlugin({
      filename: '[name].[hash].css',
      chunkFilename: '[id].[hash].css'
    })
  ]
});