export { MAX_CACHE_TTL_MILLISECONDS, MAX_CACHE_TTL_SECONDS, } from "../../utils/constants/cache.js";
/**
 * Resolve and validate a cache TTL using the contract shared by every backend.
 * Values at or below zero mean immediate expiry: remove any existing value and
 * do not store a replacement.
 */
export declare function resolveCacheTtlSeconds(ttlSeconds: number | undefined, defaultTtlSeconds?: number): number | undefined;
/**
 * Resolve a TTL for protocols that accept only whole seconds. Positive
 * fractions round up so integer conversion never expires an entry earlier than
 * requested; non-positive values retain their immediate-expiry meaning.
 */
export declare function resolveIntegerCacheTtlSeconds(ttlSeconds: number | undefined, defaultTtlSeconds?: number): number | undefined;
export declare function expiresImmediately(ttlSeconds: number | undefined): boolean;
/**
 * Convert a positive millisecond TTL to a whole-second protocol TTL. Partial
 * seconds round up so the backing store never expires an entry earlier than
 * the configured logical freshness window.
 */
export declare function cacheTtlMillisecondsToSeconds(ttlMilliseconds: number): number;
/** Validate a constructor-level TTL for whole-second cache protocols. */
export declare function requirePositiveIntegerCacheTtlSeconds(ttlSeconds: number): number;
/** Shared default used when a CacheBackend caller omits a TTL. */
export declare const DEFAULT_CACHE_TTL_SECONDS = 300;
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