export declare function probeCacheKey(...parts: string[]): string;
/**
 * Lightweight content-addressable cache for external probe responses
 * (SerpAPI, ask_ai_engine). Simpler than the cachedFetch HTTP cache —
 * no ETag/Last-Modified, no negative cache, just key → JSON with TTL.
 *
 * Misses (file absent, malformed, expired) all return null silently —
 * the caller fetches fresh and writes back.
 */
export declare function readProbeCache<T>(dir: string, key: string, ttlMs: number): Promise<T | null>;
export declare function writeProbeCache<T>(dir: string, key: string, data: T): Promise<void>;
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