webpack.config.dev.js

const path = require('path');
const webpack = require('webpack');
const HtmlPlugin = require('html-webpack-plugin');

module.exports = {
    entry: {
        app: path.join(__dirname, 'src', 'app.js'),
        vendors: ['react', 'react-dom']
    },
    output:{
        filename: '[name].js',
        path: path.join(__dirname, 'public/js/')
    },
    module: {
        rules: [
            {
                test: /(\.jsx|\.js)$/,
                exclude: /(node_modules|bower-components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ["es2015", "react"],
                        plugins: ["transform-es2015-modules-umd"]
                    }
                },
            },            
        ]
    },
    plugins: [
        new webpack.optimize.CommonsChunkPlugin({
            name: 'vendors',
            minChunks: Infinity
        }),
        new HtmlPlugin({
            title: 'learn-webpack'
        })
    ]
};