export declare const DEFAULT_RELAY_URL = "ws://localhost:3000";
export interface Settings {
    relay_url?: string;
}
export declare function loadSettings(): Promise<Settings>;
export declare function saveSettings(settings: Settings): Promise<void>;
/** Returns saved relay URL, env override, or default. */
export declare function getRelayUrl(): Promise<string>;
export declare function setRelayUrl(url: string): Promise<void>;
export declare function validateRelayUrl(url: string): {
    ok: true;
} | {
    ok: false;
    reason: string;
};