import { Cache } from '../helpers/cache';
type FilePreviewCacheValue = {
    etag?: string;
    src?: string;
    size?: number;
};
/** Build a cache key for a file, including its dimensions if provided. */
export declare function buildFilePreviewCacheKey(resourceId: string, dimensions?: [number, number]): string;
/** Releases all cached previews of a resource. */
export declare function releaseFilePreviews(resourceIds: string[]): void;
declare class CacheService {
    get filePreview(): Cache<string, FilePreviewCacheValue>;
}
export declare const cacheService: CacheService;
export {};