/**
 * Response cache for PMID and DOI metadata
 *
 * In-memory cache with TTL to avoid redundant API calls.
 * - Per ADR-001: No persistent cache files on disk
 * - Cache is warm during interactive sessions (server mode)
 * - CLI invocations start fresh
 */
import type { CslItem } from "../../core/csl-json/types.js";
/**
 * Cache configuration
 */
export interface CacheConfig {
    /** Time-to-live in milliseconds (default: 1 hour) */
    ttlMs?: number;
}
/**
 * Get cached PMID result
 */
export declare function getPmidFromCache(pmid: string): CslItem | undefined;
/**
 * Cache PMID result
 */
export declare function cachePmidResult(pmid: string, item: CslItem, config?: CacheConfig): void;
/**
 * Get cached DOI result
 */
export declare function getDoiFromCache(doi: string): CslItem | undefined;
/**
 * Cache DOI result
 */
export declare function cacheDoiResult(doi: string, item: CslItem, config?: CacheConfig): void;
/**
 * Get cached ISBN result
 */
export declare function getIsbnFromCache(isbn: string): CslItem | undefined;
/**
 * Cache ISBN result
 */
export declare function cacheIsbnResult(isbn: string, item: CslItem, config?: CacheConfig): void;
/**
 * Get cached arXiv result
 */
export declare function getArxivFromCache(arxivId: string): CslItem | undefined;
/**
 * Cache arXiv result
 */
export declare function cacheArxivResult(arxivId: string, item: CslItem, config?: CacheConfig): void;
/** Reset all caches (for test isolation) */
export declare function resetCache(): void;
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