webpack.config.js

const path = require('path');

const outputPath = path.resolve(__dirname, 'dist');

module.exports = {
  mode: 'development',

  entry: {
    bundle: './index.js',
  },

  output: {
    path: outputPath,
    publicPath: '/dist/',
    filename: '[name].js',
  },

  module: {
    rules: [
      {
        test: /\.js$/,
        use: {
          loader: 'babel-loader',
          query: { cacheDirectory: true },
        },
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
    ],
  },

  devServer: {
    publicPath: '/dist/',
  },

  devtool: 'cheap-module-source-map',
};