/**
 * Image Cache Helper
 *
 * Shared caching utilities for image fetchers.
 */
import type { ResponseCache } from '../caching/types';
/**
 * Cache a successful result.
 */
export declare function cacheResult<T>(cache: ResponseCache, key: string, data: T): Promise<void>;
/**
 * Cache a null/failed result.
 */
export declare function cacheNull(cache: ResponseCache, key: string): Promise<void>;
/**
 * Get cached result or null if not found.
 */
export declare function getCached<T>(cache: ResponseCache, key: string): Promise<{
    hit: true;
    data: T | null;
} | {
    hit: false;
}>;
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