/**
 * Toggle the streaming-card switch for a chat. `off=true` suppresses cards
 * (emoji-reaction mode); `off=false` restores them. `changed` reports whether
 * the set actually moved (idempotent re-toggles return false).
 */
export declare function setCardMode(larkAppId: string, chatId: string, off: boolean): Promise<{
    ok: true;
    changed: boolean;
} | {
    ok: false;
    reason: string;
}>;
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