webpack.config.js

const HtmlWebPackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const path = require('path');
require('dotenv/config');

module.exports = {
  devServer: {
    contentBase: path.resolve(__dirname, 'public'),
    historyApiFallback: true,
    publicPath: '/',
  },
  entry: `${__dirname}/src/index.js`,
  output: {
    path: `${__dirname}/public/`,
    filename: 'bundle.js',
    publicPath: '/',
  },
  watch: false,

  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /(node_modules)/,
        use: {
          loader: 'babel-loader',
        },
      },
      {
        test: /\.(s?)css$/,
        use: [
          // fallback to style-loader in development
          process.env.PRODUCTION === 'true' ? MiniCssExtractPlugin.loader : 'style-loader',
          'css-loader',
          'sass-loader',
        ],
      },
    ],
  },
  plugins: [
    new HtmlWebPackPlugin({
      template: './src/index.html',
    }),
    new MiniCssExtractPlugin({
      // Options similar to the same options in webpackOptions.output
      // both options are optional
      filename: '[name].css',
      chunkFilename: '[id].css',
    }),
  ],
};