preliminary/dev-server.js

const webpackDevServer = require('webpack-dev-server');
const webpack = require('webpack');

const config = require('./webpack.config.js');
const options = {
  contentBase: './dist',
  hot: true,
  host: 'localhost'
};

webpackDevServer.addDevServerEntrypoints(config,options);
const compiler = webpack(config);
const server = new webpackDevServer(compiler,options);

server.listen(5000,'localhost',()=>{
  console.log('dev server listening on port 5000');
});