export declare const CHAT_NAME_MAX_CODE_POINTS = 100;
export declare const CHAT_RENAME_COOLDOWN_MS: number;
export declare function normalizeLarkChatName(input: unknown): {
    ok: true;
    name: string;
} | {
    ok: false;
    error: 'invalid_chat_name';
};
export declare class ChatRenameCooldown {
    private readonly cooldownMs;
    private readonly lastAt;
    constructor(cooldownMs?: number);
    check(key: string, now?: number): {
        ok: true;
    } | {
        ok: false;
        retryAfterSeconds: number;
    };
    record(key: string, now?: number): void;
}
/** Serializes the read → cooldown → write transaction for one bot/chat key. */
export declare class ChatRenameSerialQueue {
    private readonly tails;
    run<T>(key: string, operation: () => Promise<T>): Promise<T>;
}
//# sourceMappingURL=chat-rename.d.ts.map