import type { LanguageModelV3Middleware } from '@ai-sdk/provider';
import type { ISmartAiCacheOptions } from './smartai.cache.js';
/**
 * Creates middleware that adds Anthropic prompt caching directives.
 * Marks the last system message and last user message with ephemeral cache control,
 * reducing input token cost and latency on repeated calls.
 */
export declare function createAnthropicCachingMiddleware(options?: ISmartAiCacheOptions): LanguageModelV3Middleware;