webpack.config.js

const { resolve } = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const Dotenv = require('dotenv-webpack');

module.exports = {
  entry: './src/index.js',
  output: {
    path: resolve(__dirname, 'dist'),
    filename: 'main.bundle.js',
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
    }),
    new MiniCssExtractPlugin(),
    new Dotenv(),
  ],
  module: {
    rules: [
      {
        test: /.html$/i,
        use: {
          loader: 'html-loader',
        },
      },
      {
        test: /\.s?[ac]ss$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader', 'sass-loader'],
      },
      {
        test: /\.m?js$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env'],
            plugins: [['@babel/transform-runtime']],
          },
        },
      },
    ],
  },
};