/**
 * Blob cache for DocShell
 *
 * Content-addressed storage for converted document text
 * Layout:
 * - blobs/<sha256>.txt - converted content
 * - meta/<sha256>.json - extraction metadata
 */
import type { ConversionResult, DocShellConfig, CacheKey } from '../types/index.js';
export interface BlobCacheEntry {
    blobPath: string;
    metaPath: string;
    text: string;
    metadata: ConversionResult['metadata'];
}
export declare class BlobCache {
    private cacheDir;
    private blobDir;
    private metaDir;
    constructor(config: DocShellConfig);
    /**
     * Ensure cache directories exist
     */
    ensureDirs(): void;
    /**
     * Get paths for a cache key
     */
    private getPaths;
    /**
     * Check if a blob exists in cache
     */
    has(key: CacheKey): boolean;
    /**
     * Get a blob from cache
     */
    get(key: CacheKey): BlobCacheEntry | null;
    /**
     * Store a blob in cache
     */
    set(key: CacheKey, result: ConversionResult): BlobCacheEntry;
    /**
     * Clear all cached blobs
     */
    clear(): void;
}