devServer.js

const path = require('path');
const webpack = require('webpack');
const webpackDevMiddleware = require('webpack-dev-middleware');
const config = require('./webpack.develop.config');
const Express = require('express');

const app = new Express();
const port = 3000;

const compiler = webpack(config);
app.use(webpackDevMiddleware(compiler, {
  noInfo: true,
  publicPath: config.output.publicPath,
}));

app.get('/', (req, res) => {
  res.sendFile(path.join(__dirname, 'example/index.html'));
});

app.listen(port, error => {
  /* eslint-disable no-console */
  if (error) {
    console.error(error);
  } else {
    console.info(
      '🌎 Listening on port %s. Open up http://localhost:%s/ in your browser.',
      port, port);
  }
  /* eslint-enable no-console */
});