webpack.config.dev.js

const path = require('path');

const HtmlWebPackPlugin = require('html-webpack-plugin');

module.exports = {
  mode: 'development',
  entry: [['16', '18'].includes(process.env.REACT_VERSION) ? './public/index.legacy.js' : './public.index.js'],
  module: {
    rules: [
      {
        test: /\.js(x?)$/,
        use: {
          loader: 'babel-loader',
          options: {
            extends: './.babelrc',
          },
        },
      },
      {
        test: /\.s?css$/,
        use: ['style-loader', 'css-loader', 'sass-loader'],
      },
    ],
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'index.js',
    publicPath: '/',
  },
  resolve: {
    extensions: ['.js', '.jsx'],
  },
  plugins: [
    new HtmlWebPackPlugin({
      template: path.resolve(__dirname, 'public/index.html'),
      filename: 'index.html',
    }),
  ],
  devServer: {
    compress: true,
    port: 3400,
    hot: true,
  },
};