webpack.prod.js

const merge = require("webpack-merge")
const common = require("./webpack.common.js")
const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin')

module.exports = merge(common, {
  mode: "production",
  plugins: [
    new OptimizeCssAssetsPlugin({
      cssProcessorPluginOptions: {
        preset: [
          'default',
          {
            discardComments: {
              removeAll: false
            },
          },
        ],
      },
    })
  ],
})