/**
 * Compute a content hash for change detection.
 *
 * For small files (<1MB), computes hash of entire content.
 * For large files (>=1MB), uses fingerprint approach (first 8KB + last 8KB + size).
 *
 * Returns 16-character hash (or 'L' prefix + 15 chars for large files).
 *
 * @param filepath - Absolute path to the file
 * @returns Content hash string, or empty string if file cannot be read
 */
export declare function computeContentHash(filepath: string): Promise<string>;
/**
 * Check if hash algorithm is compatible with current implementation.
 *
 * @param algorithm - Hash algorithm version from manifest
 * @returns true if compatible, false otherwise
 */
export declare function isHashAlgorithmCompatible(algorithm?: string): boolean;
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