import type { LifespanParameters } from "../types.js";
/**
 * Calculate lifespan parameters from revalidate value
 * CRITICAL: All timestamps are in SECONDS, not milliseconds
 *
 * @param revalidate - Revalidation period in seconds, or false to disable
 * @param defaultTTL - Default TTL in seconds if revalidate is undefined
 * @returns Lifespan parameters or null if no expiration
 */
export declare function calculateLifespan(revalidate: number | false | undefined, defaultTTL?: number): LifespanParameters | null;
/**
 * Check if a cache entry has expired based on its lifespan
 *
 * @param lifespan - Lifespan parameters (null means never expires)
 * @returns True if expired, false otherwise
 */
export declare function isExpired(lifespan: LifespanParameters | null): boolean;
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