export interface ForwardFollowupSeed<T> {
    larkAppId: string;
    chatId: string;
    senderOpenId: string;
    messageId: string;
    payload: T;
    flush: (payload: T) => void | Promise<void>;
}
export interface ForwardFollowupMatch {
    larkAppId: string;
    chatId: string;
    senderOpenId: string;
    rootId: string;
}
/** In-memory grace window for a forwarded topic's immediate clarification. */
export declare class ForwardFollowupBuffer<T> {
    private readonly waitMs;
    private readonly onFlushError;
    private readonly pending;
    constructor(waitMs: number, onFlushError?: (error: unknown) => void);
    get size(): number;
    hold(seed: ForwardFollowupSeed<T>, waitMs?: number): boolean;
    take(match: ForwardFollowupMatch): ForwardFollowupSeed<T> | undefined;
    clear(): void;
}
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