/**
 * A specialized cache implementation for storing PDF page images
 */
export declare class ImageCache {
    private cacheDir;
    private cloudBucket;
    constructor(cacheDir?: string, cloudBucket?: string);
    getLocalCachePath(fileHash: string): string;
    private getS3Prefix;
    private validateCache;
    downloadImagesToLocalCache(fileHash: string, expectedPages?: number): Promise<boolean>;
    cacheImages(cachePath: string, fileHash: string): Promise<void>;
}
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