const path = require('path') ;const BUNDLE_PATH = path.resolve(__dirname, '../../dist/bundle.js') ;if (process.env.NODE_ENV === 'production') { module.exports = function (req, res) { res.sendFile(BUNDLE_PATH) }; } else { const webpackMiddleware = require('webpack-dev-middleware') ;const webpack = require('webpack') ;const config = require('../../webpack.config.js') ;config.output.filename = '/app.js'; config.output.path = '/'; module.exports = webpackMiddleware(webpack(config)) }