dev-server.js

const WebpackDevServer = require("webpack-dev-server");
const webpack = require("webpack");

const config = require("./webpack.config-builder")({
  withDevServer: true,
});

config.entry.main.unshift(
  `webpack-dev-server/client?http://localhost:${config.devServer.port}/`,
  `webpack/hot/dev-server`,
);

const compiler = webpack(config);
const server = new WebpackDevServer(config.devServer, compiler);

server.startCallback(() => {
  console.log(`dev server listening on port ${config.devServer.port}`);
});