import type { Cache, CacheStore } from './cache-interface';
/**
 * Default cache options
 */
export declare const DEFAULT_CACHE_OPTIONS: {
    ttl: {
        mx: number;
        disposable: number;
        free: number;
        domainValid: number;
        smtp: number;
        smtpPort: number;
        domainSuggestion: number;
        whois: number;
    };
    maxSize: {
        mx: number;
        disposable: number;
        free: number;
        domainValid: number;
        smtp: number;
        smtpPort: number;
        domainSuggestion: number;
        whois: number;
    };
};
/**
 * Get the default in-memory cache singleton using LRU
 * This is created on first access and reused for all subsequent calls
 */
export declare function getDefaultCache(): Cache;
/**
 * Helper function to get cache store from cache parameter
 * Follows same pattern as logging - use passed cache or default
 */
export declare function getCacheStore<T>(cache: Cache | null | undefined, key: keyof Cache): CacheStore<T>;
/**
 * Clear the default cache instance
 * Useful for testing or when you want to reset cache state
 */
export declare function clearDefaultCache(): void;
/**
 * Reset the default cache instance to a fresh one
 */
export declare function resetDefaultCache(): void;
export type { Cache, CacheStore } from './cache-interface';