/** Generic in-memory cache with TTL expiration and optional max size. */
export declare class TTLCache<K, V> {
    private defaultTTL;
    private cache;
    private maxSize;
    constructor(defaultTTL?: number, maxSize?: number);
    get(key: K): V | undefined;
    set(key: K, value: V, ttl?: number): void;
    invalidate(key: K): void;
    /** Invalidate all entries whose key starts with the given prefix. */
    invalidatePrefix(prefix: string): void;
    clear(): void;
    get size(): number;
}
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