webpack.config.js

const path = require('path');

const BUILD_DIR = path.resolve(__dirname, 'build');
const APP_DIR = path.resolve(__dirname, 'app');

const config = {
    entry: APP_DIR + '/index.js',
    output: {
        path: BUILD_DIR,
        filename: 'bundle.js'
    },
    devServer: {
        contentBase: './',
        writeToDisk: true
    },
    module: {
        rules: [
            {
                test: /\.jsx?/,
                include: APP_DIR,
                exclude: /(node_modules|bower_components)/,
                loader: 'babel-loader',
                query: {
                    presets: ['es2015', 'react']
                }
            },
            {
                test: /\.css$/,
                loaders: ['style-loader', 'css-loader'],
            },
            {
                test: /\.(png|jpg|JPG|jpeg|JPEG|gif|ttf|eot|woff|woff2)$/,
                use: [
                    {
                        loader: 'file-loader',
                        options: {
                            name: '[path][name].[ext]',
                        }
                    }
                ]
            },
        ]
    }

};

module.exports = config;