webpack.config.js

// Generated using webpack-cli https://github.com/webpack/webpack-cli

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const WorkboxWebpackPlugin = require('workbox-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const autoprefixer = require('autoprefixer');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const isProduction = process.env.NODE_ENV === 'production';

const config = {
  target: 'web',
  entry: './src/js/index.js',
  output: {
    filename: 'main.js',
    path: path.resolve(__dirname, 'dist'),
  },
  devServer: {
    open: true,
    static: path.resolve(__dirname, 'dist'),
    port: 9000,
    host: 'localhost',
    hot: true,
  },
  watchOptions: {
    poll: true,
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './index.html',
    }),
    new MiniCssExtractPlugin(),
    new CleanWebpackPlugin(),
    // Add your plugins here
    // Learn more about plugins from https://webpack.js.org/configuration/plugins/
  ],
  module: {
    rules: [
      {
        test: /\.(eot|svg|ttf|woff|woff2|png|jpg|gif)$/i,
        type: 'asset',
      },
      {
        test: /\.(scss)$/,
        use: [
          {
            // Extracts CSS for each JS file that includes CSS
            loader: MiniCssExtractPlugin.loader,
          },
          {
            // Interprets `@import` and `url()` like `import/require()` and will resolve them
            loader: 'css-loader',
          },
          {
            // Loader for webpack to process CSS with PostCSS
            loader: 'postcss-loader',
            options: {
              postcssOptions: {
                plugins: [
                  autoprefixer,
                ],
              },
            },
          },
          {
            // Loads a SASS/SCSS file and compiles it to CSS
            loader: 'sass-loader',
          },
        ],
      },

      // Add your rules for custom modules here
      // Learn more about loaders from https://webpack.js.org/loaders/
    ],
  },
};

module.exports = () => {
  if (isProduction) {
    config.mode = 'production';

    config.plugins.push(new WorkboxWebpackPlugin.GenerateSW());
  } else {
    config.mode = 'development';
  }
  return config;
};