/**
 * Catalog State Management - Handles monotonic tracking for downgrade detection
 */
import { CatalogState, CatalogCache } from '../types.js';
/**
 * Get snapshot file path by hash
 */
export declare function getSnapshotPath(hash: string): string;
/**
 * Load catalog state from disk
 */
export declare function loadCatalogState(catalogUrl: string): Promise<CatalogState>;
/**
 * Save catalog state to disk
 */
export declare function saveCatalogState(state: CatalogState): Promise<void>;
/**
 * Save snapshot to disk (by content hash)
 */
export declare function saveSnapshot(hash: string, cache: CatalogCache): Promise<void>;
/**
 * Load snapshot from disk (by content hash)
 */
export declare function loadSnapshot(hash: string): Promise<CatalogCache | null>;
/**
 * Check if a snapshot time is older than the latest seen
 */
export declare function isOlderSnapshot(snapshotTime: string, latestSeenTime: string | null): boolean;
/**
 * Update the monotonic tracking with a new snapshot
 */
export declare function updateMonotonicTracking(state: CatalogState, snapshotHash: string, snapshotTime: string): CatalogState;
/**
 * Load monotonic tracking (persisted separately from clearable cache)
 */
export declare function loadMonotonicTracking(): Promise<{
    latestSeenHash: string | null;
    latestSeenTime: string | null;
}>;
/**
 * Save monotonic tracking (persisted separately for security)
 */
export declare function saveMonotonicTracking(data: {
    latestSeenHash: string | null;
    latestSeenTime: string | null;
}): Promise<void>;
/**
 * Clear all catalog state and snapshots
 * NOTE: Does NOT clear monotonic tracking to prevent downgrade attacks
 */
export declare function clearCatalogState(): Promise<void>;
/**
 * List cached snapshot hashes
 */
export declare function listCachedSnapshots(): Promise<string[]>;
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