setUsername(username: string): void

import url from 'pts/url';

export default function () {
  const u = 'http://user:pass@www.example.com:8080/test/index.html?name=xxx&age=18#worker';

  const uu = new url.URL(u);
  console.log(uu.username()); // user
  uu.setUsername('username');
  console.log(uu.username()); // username
}