/**
 * Image comparison and diff utilities
 */
import { DiffResult } from '../types';
/**
 * Compares two PNG images at the pixel level and generates a diff image
 */
export declare function pixelLevelDiff(pngA: Buffer, pngB: Buffer, threshold?: number): DiffResult;
/**
 * Compares two image files (SVG or PNG) and generates a diff image
 */
export declare function diffImages(pathA: string, pathB: string, diffFilePath?: string, threshold?: number): Promise<DiffResult>;
/**
 * Legacy function name for diffImages
 *
 * @deprecated Use diffImages instead
 */
export declare function diffSvg(pathA: string, pathB: string, diffFilePath: string): Promise<DiffResult | void>;