webpack.prod.js

const path = require('path');
const { merge } = require('webpack-merge');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const common = require('./webpack.common');

module.exports = merge(common, {
  mode: 'production',
  output: {
    filename: 'main.[contenthash].js',
    path: path.resolve(__dirname, 'dist'),
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: 'main.[contenthash].css',
    }),
    new CleanWebpackPlugin({
      cleanAfterEveryBuildPatterns: ['dist'],
    }),
  ],
  module: {
    rules: [
      {
        test: /\.scss$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: {
              publicPath: './',
            },
          },
          'css-loader',
          'sass-loader',
        ],
      },
    ],
  },
});