declare class ImageCacheManager {
    private cache;
    private readonly CACHE_DURATION;
    /**
     * Generate cache key from API URL and date
     */
    private getCacheKey;
    /**
     * Get cached image URL if available and not expired
     */
    getCachedImage(apiUrl: string, date: string): string | null;
    /**
     * Cache image URL with expiration
     */
    setCachedImage(apiUrl: string, date: string, imageUrl: string): void;
    /**
     * Remove specific cached image and revoke blob URL
     */
    removeCachedImage(apiUrl: string, date: string): void;
    /**
     * Clear all cached images and revoke blob URLs
     */
    clearCache(): void;
    /**
     * Clean up expired entries
     */
    cleanupExpired(): void;
}
export declare const imageCache: ImageCacheManager;
export {};