To create a custom server implementation.

This mode uses SockJS-node as a server.

webpack.config.js

module.exports = {
  // ...
  devServer: {
    webSocketServer: "sockjs",
  },
};

Usage via CLI:

npx webpack serve --web-socket-server sockjs --open

1. The script should open http://localhost:8080/ in your default browser.
2. You should see the text on the page itself change to read Success!.