/**
 * Cache service interface for domain-level caching (e.g. registry payloads).
 * TTL is in milliseconds when supported by the store.
 */
export interface CacheService {
    /**
     * Get a value from the cache.
     * @param key - Cache key
     * @returns The cached value, or undefined if not found or expired
     */
    get: (key: string) => Promise<unknown | undefined>;
    /**
     * Set a value in the cache with optional TTL.
     * @param key - Cache key
     * @param value - Value to cache
     * @param ttlMs - Optional time-to-live in milliseconds
     */
    set: (key: string, value: unknown, ttlMs?: number) => Promise<void>;
}
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