webpack.prod.js

const path = require('path');
const webpack = require('webpack');
const { merge } = require('webpack-merge');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const LicenseWebpackPlugin = require('license-webpack-plugin')
  .LicenseWebpackPlugin;

const base = require('./webpack.base.js');

module.exports = merge(base, {
  mode: 'production',
  target: 'browserslist',
  devtool: 'cheap-source-map',
  // optimization: {
  //   minimize: true,
  // },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
          },
          'css-loader',
          'postcss-loader',
        ],
      },
    ],
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': '"production"',
      'process.env.BASE_URL': '"/"',
      APP_SECRET: '"hello"',
    }),
    new MiniCssExtractPlugin({
      filename: '[name].[chunkhash].css',
      chunkFilename: '[id].[chunkhash].css',
    }),
    new LicenseWebpackPlugin(),
  ],
});