/**
 * File-based TTL cache for cross-process API call deduplication.
 *
 * Dashboard and CLI share cached data via /tmp/perp-cli-cache/.
 * Writes are atomic (write to .tmp then rename) to prevent partial reads.
 */
export declare const TTL_ACCOUNT = 15000;
export declare const TTL_MARKET = 30000;
export declare function getCached<T>(key: string): T | null;
export declare function setCached<T>(key: string, data: T, ttlMs: number): void;
/**
 * Read-through cache: returns cached data if fresh, else fetches and caches.
 * Used by dashboard and read-only queries.
 */
export declare function withCache<T>(key: string, ttlMs: number, fetcher: () => Promise<T>): Promise<T>;
/**
 * Write-through fetch: always fetches live data, then writes to cache for others to use.
 * Used by execution layer (CLI trades) where stale data is unacceptable.
 */
export declare function fetchAndCache<T>(key: string, ttlMs: number, fetcher: () => Promise<T>): Promise<T>;
/**
 * Invalidate cache entries matching a prefix (e.g., "acct" after a trade).
 */
export declare function invalidateCache(keyPrefix?: string): void;