/**
 * Visual Diff
 *
 * Pixel-by-pixel comparison of screenshots using a simple diff algorithm.
 * Uses raw pixel comparison without external dependencies.
 */
export interface VisualDiffResult {
    mismatchPercentage: number;
    mismatchCount: number;
    totalPixels: number;
    diffImagePath?: string;
    /** Path to the interactive HTML viewer with side-by-side + overlay views. */
    diffViewerPath?: string;
    pass: boolean;
    /**
     * When the comparison failed for IO/permission reasons (NOT a real pixel
     * mismatch), this carries the error message. CI users debugging "100%
     * mismatch" can check this to distinguish a real regression from a typo
     * in baselineDir or a missing baseline.
     */
    error?: string;
    /** True when the baseline was not found (vs. a real error). */
    baselineMissing?: boolean;
}
/**
 * Simple visual diff using Playwright's built-in comparison.
 * Takes two PNG buffers and returns mismatch info.
 *
 * For pixel-perfect comparison, we compare raw buffer bytes.
 * For a production-grade solution, pixelmatch can be added as optional dep.
 */
export declare function visualDiff(baseline: Buffer, current: Buffer, options?: {
    threshold?: number;
    outputPath?: string;
}): Promise<VisualDiffResult>;
/**
 * Compare screenshots from a directory against baselines.
 */
export declare function diffDirectory(baselineDir: string, currentDir: string, options?: {
    threshold?: number;
}): Promise<Array<{
    file: string;
    result: VisualDiffResult;
}>>;
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