/**
 * Configuration options for the AgedLRUCache.
 */
export type AgedLRUCacheOpts = {
    /** Maximum number of entries. Defaults to 256. */
    capacity?: number;
    /** Maximum age in milliseconds before entries expire. Defaults to 30000. */
    maxAge?: number;
    /** Custom time function for testing. Defaults to Date.now. */
    now?: () => number;
};
/**
 * An LRU cache with time-based expiration.
 *
 * Entries are evicted when they exceed maxAge or when the cache reaches
 * capacity (least recently used entries are removed first).
 */
export declare class AgedLRUCache<K, V> {
    private maxAge;
    private capacity;
    private cache;
    private now;
    constructor(opts?: AgedLRUCacheOpts);
    get(key: K): V | undefined;
    put(key: K, value: V): void;
    get size(): number;
}
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