Function isAddrInUse

e2e/src/ports.ts:233–247

(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. Vite's --strictPort
    // exit never says EADDRINUSE at all — the CLI catches the bind failure
    // and dies with "Port N is already in use", which reaches us only as
    // BootProcessExitError's log tail — so match that phrasing as well, or
    // the claimAndBoot re-claim retry never engages for the most common
    // collision (a Linux ephemeral outbound socket grabbing the claimed
    // port between probe release and vite's bind).
    if (/EADDRINUSE|is already in use/.test(cursor.message)) return true;
  }
  return false;
};

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