webpack.config.js

const path = require('path');
module.exports = {
  mode: "none",
  entry: "./src/index.js",
  output: {
    path: __dirname + '/dist',
    filename: "bundle.js"
  },
  devtool: 'cheap-module-eval-source-map',
  devServer: {
    contentBase: path.join(__dirname, 'dist'),
    historyApiFallback: true
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          {
            loader: 'style-loader',
          },
          {
            loader: 'css-loader',
            options: {
              importLoaders: 1,
            }
          },
          {
            loader: 'postcss-loader'
          }
        ]
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: {
            presets: [
              "@babel/preset-env",
            ]
          }
        }
      },
      {
        test: /\.html$/i,
        loader: 'html-loader',
      },
    ]
  }
}