/**
 * Ref-counted map with explicit retention semantics. Entries are unowned by default and may be evicted after their
 * TTL unless explicitly retained. This provides TTL-based caching for unowned entries, while allowing consumers to
 * opt into stronger lifetime control via explicit retention.
 */
export declare class RefCountedMap<K, V> {
    private readonly map;
    private readonly unownedEntryTtlMs;
    private readonly ttlCheck;
    static readonly TTLCheck: {
        readonly ON_GET: number;
        readonly ON_RETAIN: number;
        readonly ON_RELEASE: number;
    };
    constructor({ unownedEntryTtlMs, ttlCheck, }: {
        unownedEntryTtlMs: number;
        ttlCheck?: number;
    });
    get size(): number;
    get(key: K): V | undefined;
    getOrCreate(key: K, init: () => V): V;
    /**
     * Returns true on transition from unowned to owned
     */
    retain(key: K, value: V): boolean;
    /**
     * Returns true on transition from owned to unowned
     */
    release(key: K, value: V): boolean;
    private removeExpired;
}
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