/**
 * Marker file written after a cache entry is fully populated.
 */
export declare const CACHE_MARKER_FILE = "wp-typia-template-cache.json";
/**
 * Marker file written after a full TTL prune scan completes.
 */
export declare const CACHE_PRUNE_MARKER_FILE = "wp-typia-template-cache-prune.json";
/**
 * Serializable metadata recorded in cache markers for diagnostics.
 */
export type ExternalTemplateCacheMetadata = Record<string, string | null>;
export interface ExternalTemplateCacheEntryMarker {
    createdAtMs: number;
    metadata: ExternalTemplateCacheMetadata;
}
export interface ExternalTemplateCachePruneMarker {
    prunedAtMs: number;
    pruneIntervalMs: number | null;
    ttlMs: number;
}
export declare function sanitizeExternalTemplateCacheMetadata(metadata: ExternalTemplateCacheMetadata): ExternalTemplateCacheMetadata;
export declare function parseExternalTemplateCacheEntryMarker(markerText: string): ExternalTemplateCacheEntryMarker | null;
export declare function externalTemplateCacheMetadataMatches(actual: ExternalTemplateCacheMetadata, expected: ExternalTemplateCacheMetadata): boolean;
export declare function isExternalTemplateCacheEntryFreshForTtl(createdAtMs: number, nowMs: number, ttlMs: number | null): boolean;
export declare function parseExternalTemplateCachePruneMarker(markerText: string): ExternalTemplateCachePruneMarker | null;
export declare function formatExternalTemplateCacheEntryMarker({ cacheKey, createdAt, metadata, namespace }: {
    cacheKey: string;
    createdAt: Date;
    metadata: ExternalTemplateCacheMetadata;
    namespace: string;
}): string;
export declare function formatExternalTemplateCachePruneMarker({ nowMs, pruneIntervalMs, ttlMs }: {
    nowMs: number;
    pruneIntervalMs: number | null;
    ttlMs: number;
}): string;