/**
 * HTTP Cache utility with ETag and Cache-Control support
 * Implements client-side caching following HTTP standards
 */
interface CacheEntry<T> {
    data: T;
    etag?: string;
    cacheControl?: string;
    timestamp: number;
}
interface CacheControlDirectives {
    maxAge?: number;
    public?: boolean;
    private?: boolean;
    noCache?: boolean;
    noStore?: boolean;
    mustRevalidate?: boolean;
}
/**
 * HTTP Cache Manager
 * Singleton pattern for managing HTTP cache across the SDK
 */
declare class HttpCacheManager {
    private static instance;
    private cache;
    private constructor();
    static getInstance(): HttpCacheManager;
    /**
     * Fetch with HTTP caching (ETag + Cache-Control)
     */
    fetchWithCache<T>(url: string): Promise<T>;
    /**
     * Clear cache for a specific URL or all cache
     */
    clearCache(url?: string): void;
    /**
     * Get cache statistics
     */
    getCacheStats(): {
        size: number;
        entries: string[];
    };
}
export declare const httpCache: HttpCacheManager;
export type { CacheEntry, CacheControlDirectives };
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