Function pickPort

apps/vis/scripts/dev.mjs:29–38

(startPort, exclude = new Set())

}

async function pickPort(startPort, exclude = new Set()) {
  for (let port = startPort; port < startPort + MAX_PROBE; port += 1) {
    if (exclude.has(port)) continue;
    // eslint-disable-next-line no-await-in-loop
    if (await isFree(port)) return port;
  }
  throw new Error(
    `no free port in [${startPort}, ${startPort + MAX_PROBE}); something is hogging the range`,
  );
}

const requestedApi = Number(process.env.PORT) || DEFAULT_API_PORT;
const apiPort = await pickPort(requestedApi);