webpack.config.js

const path = require('path')
const CopyPlugin = require('copy-webpack-plugin')
const ExtractTextPlugin = require("extract-text-webpack-plugin");

module.exports = {
  mode: process.NODE_ENV || 'development',
  entry: path.resolve(__dirname, 'src/index.js'),
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js'
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        loader: 'babel-loader',
      },
      {
        test: /\.s?css$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: [
            'css-loader',
            'sass-loader'
          ]
        })
      }
    ]
  },
  plugins: [
    new CopyPlugin({
      patterns: [
        { from: 'src/index.html', to: 'index.html' },
        { from: 'src/site.webmanifest', to: 'site.webmanifest' },
        { from: 'src/*.png', flatten: true },
        { from: 'src/*.ico', flatten: true }
      ]
    }),
    new ExtractTextPlugin('bundle.css'),
  ],
  resolve: {
    alias: {
      "react": "preact/compat",
      "react-dom/test-utils": "preact/test-utils",
      "react-dom": "preact/compat",
    }
  }
}