export interface ComparisonScreenshot {
    readonly base64: string;
    readonly mimeType: "image/png";
    readonly width: number;
    readonly height: number;
    readonly url: string;
    readonly timestamp: string;
}
export interface ComparisonResult {
    readonly screenshotA: ComparisonScreenshot;
    readonly screenshotB: ComparisonScreenshot;
    readonly differencePercent: number;
    readonly pixelsChanged: number;
    readonly dimensions: {
        readonly width: number;
        readonly height: number;
    };
    readonly diffImage: string;
    readonly urlA: string;
    readonly urlB: string;
}
/**
 * Compare two URLs by capturing screenshots of each and computing
 * the pixel-level difference between them.
 *
 * Captures both pages at the same viewport dimensions, then uses
 * pixelmatch to compute an accurate pixel difference. Returns both
 * screenshots, a red-highlighted diff image, and difference metrics.
 */
export declare function compareScreenshots(urlA: string, urlB: string, options?: {
    readonly width?: number;
    readonly height?: number;
}): Promise<ComparisonResult>;
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