const webpack = require('webpack'); const WebpackDevServer = require('webpack-dev-server'); const opn = require('opn'); const config = require('./webpack.config.demo'); const PORT = 3000; const HOST = 'localhost'; const URL = `http://${HOST}:${PORT}`; new WebpackDevServer(webpack(config), { publicPath: config.output.publicPath, }).listen(PORT, HOST, (error, result) => { if (error) { console.error(error); } opn(URL); console.log(`Listening at ${URL}`); });