export interface ReferenceCheckCacheEntry {
    exists: boolean;
    statusCode?: number;
    timestamp: number;
}
export interface ReferenceCheckCacheStats {
    size: number;
    entries: Array<{
        reference: string;
        exists: boolean;
        age: number;
    }>;
}
export declare class ReferenceCheckCache {
    private entries;
    get(reference: string, ttlMs: number): ReferenceCheckCacheEntry | null;
    set(reference: string, exists: boolean, statusCode?: number): void;
    clear(): void;
    get size(): number;
    getStats(): ReferenceCheckCacheStats;
}
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