Function isAddrInUse

e2e/src/ports.ts:233–241

(error: unknown)

/** True when an error (or any nested cause) is an EADDRINUSE bind failure. */
export const isAddrInUse = (error: unknown): boolean => {
  for (let cursor: unknown = error; cursor instanceof Error; cursor = cursor.cause) {
    if ((cursor as NodeJS.ErrnoException).code === "EADDRINUSE") return true;
    // The emulate/vite boot glue wraps the OS error in a plain Error whose
    // message carries the code, so match the text too.
    if (/EADDRINUSE/.test(cursor.message)) return true;
  }
  return false;
};

/**
 * Claim a port block and boot the services that bind it, retrying on EADDRINUSE.