webpack.config.js

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

const path = require('path');
const CopyPlugin = require("copy-webpack-plugin");
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const isProduction = process.env.NODE_ENV == 'production';
// const stylesHandler = isProduction ? MiniCssExtractPlugin.loader : 'style-loader';
const stylesHandler = MiniCssExtractPlugin.loader;

const config = {
  context: path.resolve(__dirname, 'assets'),
  entry: {
    styles: './css/site.scss',
    script: './js/site.js'
  },
  output: {
    path: path.resolve(__dirname, '.tmp/dist/assets'),
    clean: true,
  },
  plugins: [
    new CopyPlugin({
      patterns: [
        { from: './images', to: 'images' },
      ],
    }),

    // Add your plugins here
    // Learn more about plugins from https://webpack.js.org/configuration/plugins/
  ],
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/i,
        loader: 'babel-loader',
      },
      {
        test: /\.css$/i,
        use: [stylesHandler,'css-loader'],
      },
      {
        test: /\.s[ac]ss$/i,
        use: [stylesHandler, 'css-loader', 'sass-loader'],
      },
      {
        test: /\.(eot|svg|ttf|woff|woff2|png|jpg|gif)$/i,
        type: 'asset',
      },

      // 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 MiniCssExtractPlugin());
  } else {
    config.mode = 'development';
    config.devtool = 'inline-source-map';
    config.plugins.push(new MiniCssExtractPlugin());
  }
  return config;
};