export interface DeadLetter {
    id: string;
    node: string;
    input: Record<string, unknown>;
    error: Error;
    attempts: number;
    timestamp: number;
}
export declare class DeadLetterQueue {
    private static readonly MAX_PER_THREAD;
    private letters;
    record(threadId: string, node: string, input: Record<string, unknown>, error: Error, attempts: number): DeadLetter;
    getAll(threadId: string): DeadLetter[];
    remove(threadId: string, dlId: string): boolean;
    clear(threadId: string): void;
    size(): number;
}
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