Function tryPort

scripts/dev-safe.mjs:235–243

* Check if a port is available by attempting to bind to it. * * @param {number} port - The port to check * @param {string} host - The host to bind to * @returns {Promise } True if the port is available

(port, host = "127.0.0.1")

 * @returns {Promise<boolean>} True if the port is available
 */
function tryPort(port, host = "127.0.0.1") {
  return new Promise((resolve) => {
    const server = net.createServer();
    server.once("error", () => resolve(false));
    server.listen(port, host, () => {
      server.close(() => resolve(true));
    });
  });
}

/**
 * Assert that all listed ports are available, throwing a descriptive error if