denoland/deno · error · TypeError

Unsupported transport: '${transport}'

Error message

Unsupported transport: '${transport}'

What it means

Error "Unsupported transport: '${transport}'" thrown in denoland/deno.

Source

Thrown at ext/net/01_net.js:633

    }
    case "vsock": {
      const { 0: rid, 1: cid, 2: port } = op_net_listen_vsock(
        args.cid,
        args.port,
      );
      const addr = {
        transport: "vsock",
        cid,
        port,
      };
      return new Listener(rid, addr, "vsock");
    }
    case "tunnel": {
      const { 0: rid, 1: addr } = op_net_listen_tunnel();
      return new Listener(rid, addr, "tunnel");
    }
    default:
      throw new TypeError(`Unsupported transport: '${transport}'`);
  }
}

function validatePort(maybePort, isServer = false) {
  // A missing port means "any available port" (port 0) for servers. Clients
  // must always specify a port to connect to, so a missing port is left as-is
  // and rejected below.
  if (isServer && (maybePort === null || maybePort === undefined)) {
    maybePort = 0;
  }
  if (typeof maybePort !== "number" && typeof maybePort !== "string") {
    throw new TypeError(`Invalid port (expected number): ${maybePort}`);
  }
  if (maybePort === "") throw new TypeError("Invalid port: ''");
  const port = Number(maybePort);
  if (!NumberIsInteger(port)) {
    if (NumberIsNaN(port) && !NumberIsNaN(maybePort)) {
      throw new TypeError(`Invalid port: '${maybePort}'`);

View on GitHub (pinned to 89f33cbef2)

When it happens

Trigger: Thrown at ext/net/01_net.js:633 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of denoland/deno@89f33cbef2 (2026-08-16). Data as JSON: /api/errors/92436722caf80723. Report an issue: GitHub.