import { type MediaFilePreview } from '../types';
export declare const PREVIEW_CACHE_LRU_SIZE = 50;
export declare class ObjectURLCache {
    private readonly cache;
    private readonly activeRefs;
    constructor(size: number);
    /**
     * Marks a cache key as actively in use by a consumer.
     * Multiple consumers can acquire the same key; eviction is
     * blocked until all consumers have released it.
     */
    acquire(key: string): void;
    release(key: string): void;
    private isInUse;
    has(key: string): boolean;
    get(key: string): MediaFilePreview | undefined;
    set(key: string, value: MediaFilePreview): void;
    remove(key: string): void;
    clear(): void;
}
export declare const createObjectURLCache: () => ObjectURLCache;