webpack.dev.js

const path = require('path');
const { merge } = require('webpack-merge');
const common = require('./webpack.common.js');
const webpack = require('webpack');

module.exports = merge(common, {
  mode: 'development',
  devtool: 'inline-source-map',
  stats: 'errors-only',
  devServer: {
    static: {
      directory: path.join(__dirname, 'public'),
    },
    port: 9000,
    open: true,
    liveReload: true,
    watchFiles: ['./src/index.html', './src/style.css', './src/app.js'],
  },
  optimization: {
    runtimeChunk: 'single',
  },
  module: {
    rules: [
      {
        test: /\.css$/i,
        use: [
          {
            loader: "style-loader",
          },
          {
            loader: "css-loader",
            options: {
              modules: {
                namedExport: false,
              },
            },
          },
        ],
      },
      {
        test: /\.js$/,
        loader: 'esbuild-loader',
        options: {
          target: 'es2017' // Syntax to compile to (see options below for possible values)
        }
      },
    ]
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
  ]
});