/**
 * Config file loading for quest-dev
 * Resolves settings from CLI flags → ~/.config/quest-dev/config.json
 */
export interface QuestDevConfig {
    pin?: string;
    port?: number;
    host?: string;
    device?: string;
    idleTimeout?: number;
    lowBattery?: number;
    unpluggedTimeout?: number;
    debuggingPort?: number;
}
/**
 * Path to config.json, honoring XDG_CONFIG_HOME (via configDir) with a
 * ~/.config fallback. A function, not a const, so the env var is read at
 * call time — keeping config.json and devices.json in the same XDG root.
 */
export declare function configPath(): string;
/**
 * Load config from configDir()/config.json (XDG-aware).
 */
export declare function loadConfig(): QuestDevConfig;
/**
 * Save config values to ~/.config/quest-dev/config.json
 * Merges with existing config (doesn't overwrite unrelated fields).
 */
export declare function saveConfig(values: QuestDevConfig): string;
/**
 * Resolve PIN from CLI flag, then config files
 */
export declare function loadPin(cliPin?: string): string;
/**
 * Like loadPin, but returns null instead of exiting when no PIN is configured.
 * Use this in long-running processes (e.g. the daemon) where a missing PIN
 * should fail one request, not crash the whole process.
 */
export declare function tryLoadPin(cliPin?: string): string | null;
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