My webpack configuration (+ package.json)

package.json

{
  "name": "twinnation",
  "author": "TwiN",
  "description": "TwiNNatioN",
  "version": "0.7.5",
  "license": "MIT",
  "main": "src/App.js",
  "scripts": {
    "start-webpack": "webpack-dev-server --port 80 --hot --progress --colors",
    "build-webpack": "webpack --config webpack.config.js -p",
    "start": "set PORT=80 && react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  },
  "dependencies": {},
  "devDependencies": {
    "axios": "^0.17.1",
    "jquery": "^3.2.1",
    "react": "^16.2.0",
    "react-bootstrap": "^0.31.5",
    "react-burger-menu": "^2.1.11",
    "react-dom": "^16.2.0",
    "react-fontawesome": "^1.6.1",
    "react-images": "^0.5.13",
    "react-photo-gallery": "^6.0.22",
    "react-router": "^4.2.0",
    "react-router-dom": "^4.2.2",
    "react-scripts": "1.0.17",
    "react-syntax-highlighter": "^6.1.1",
    "babel-core": "^6.26.0",
    "babel-eslint": "^8.0.3",
    "babel-loader": "^7.1.2",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "eslint": "^4.13.1",
    "eslint-plugin-react": "^7.5.1",
    "file-loader": "^1.1.6",
    "css-loader": "^0.28.7",
    "style-loader": "^0.19.1",
    "url-loader": "^0.6.2",
    "webpack": "^3.10.0",
    "webpack-dev-server": "2.7.1",
    "preact": "^8.2.7",
    "preact-compat": "^3.17.0"
  },
  "repository": {
    "type": "git",
    "url": "https://github.com/TwinProduction/TwiNNatioN"
  }
}

webpack.config.js

var webpack = require('webpack');
var path = require('path');

var BUILD_DIR = path.resolve(__dirname, '../src/main/resources/static/');
var APP_DIR = path.resolve(__dirname, 'src/');

var config = {
    entry: APP_DIR + '/index.js',
    output: {
        path: BUILD_DIR,
        filename: 'bundle.js'
    },
    module : {
        loaders : [
            {
                test: /\.jsx?$/,
                exclude: /node_modules/,
                include: APP_DIR,
                loader: 'babel-loader',
                query: {
                    presets: ['es2015', 'react']
                }
            },
            {
                test: /\.css$/,
                exclude: /node_modules/,
                loader: ['style-loader', 'css-loader']
            }
        ]
    },
    resolve : {
        extensions: ['.js', '.jsx'],
        alias: {
            "react": "preact-compat",
            "react-dom": "preact-compat"
        }

    },
    devServer: {
        contentBase: "./public",
        historyApiFallback: true,
        hot: true
    },
    plugins: [
        new webpack.DefinePlugin({
            'process.env.NODE_ENV': '"production"'
        }),
        new webpack.optimize.UglifyJsPlugin({
            screw_ie8: true,
            comments: false
        }),
        new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/)
    ]
};

module.exports = config;