Function getPorts

lib/getPort.js:92–128

* @param {number} basePort base port * @param {string=} host host * @returns {Promise } resolved port

(basePort, host)

 * @returns {Promise<number>} resolved port
 */
async function getPorts(basePort, host) {
  if (basePort < minPort || basePort > maxPort) {
    throw new Error(`Port number must lie between ${minPort} and ${maxPort}`);
  }

  let port = basePort;

  const localhosts = getLocalHosts();
  const hosts =
    host && !localhosts.has(host)
      ? new Set([host])
      : /* If the host is equivalent to localhost
       we need to check every equivalent host
       else the port might falsely appear as available
       on some operating systems  */
        localhosts;
  /** @type {Set<string | undefined>} */
  const portUnavailableErrors = new Set(["EADDRINUSE", "EACCES"]);
  while (port <= maxPort) {
    try {
      const availablePort = await getAvailablePort(port, hosts);
      return availablePort;
    } catch (error) {
      /* Try next port if port is busy; throw for any other error */
      if (
        !portUnavailableErrors.has(
          /** @type {NodeJS.ErrnoException} */ (error).code,
        )
      ) {
        throw error;
      }
      port += 1;
    }
  }

  throw new Error("No available ports found");
}

export default getPorts;