plz-port

please give me any port if the port is opened.

const plzPort = require('plz-port');

plzPort().then((port) => {
  assert(port >= 3000); // random port range is 3000 < 65535
  assert(port <= 65535);
});

plzPort(3000).then((port) => {
  console.log(port); // 3000 if the port is opened.
});

plzPort(8080).then((port) => {
  console.log(port); // 8081, 8082, 8083.... increment the port until found open port
});