Function saveDefaultServer

speedtest/speedtest.ts:213–215

(serverId: number | null)

  try {
    // Only clear default_server_id while preserving other settings
    const cfg = readConfig();
    delete cfg.default_server_id;
    fs.writeFileSync(SPEEDTEST_JSON, JSON.stringify(cfg));
  } catch (error: any) {
    console.error("Failed to remove default server:", error);
  }