/**
 * QA360 Visual Regression Testing
 *
 * Compares screenshots against baselines to detect visual changes.
 * Uses pixel diffing with configurable thresholds.
 */
export interface VisualRegressionConfig {
    /** Directory to store baseline images */
    baselineDir?: string;
    /** Directory to store actual images */
    actualDir?: string;
    /** Directory to store diff images */
    diffDir?: string;
    /** Maximum allowed pixel difference (0-1) */
    maxDiffThreshold?: number;
    /** Maximum allowed different pixels (0-1) */
    maxDifferentPixels?: number;
    /** Whether to update baselines */
    updateBaselines?: boolean;
    /** Whether to ignore anti-aliasing differences */
    ignoreAntiAliasing?: boolean;
    /** Color to highlight differences */
    diffColor?: {
        r: number;
        g: number;
        b: number;
    };
}
export interface VisualRegressionResult {
    name: string;
    status: 'pass' | 'fail' | 'updated';
    diffPixels: number;
    diffPercentage: number;
    diffImagePath?: string;
    baselinePath: string;
    actualPath: string;
    error?: string;
}
export interface ScreenshotData {
    width: number;
    height: number;
    data: Buffer;
}
/**
 * Visual Regression Tester
 *
 * Captures screenshots and compares them against baseline images.
 */
export declare class VisualRegressionTester {
    private baselineDir;
    private actualDir;
    private diffDir;
    private maxDiffThreshold;
    private maxDifferentPixels;
    private updateBaselines;
    private ignoreAntiAliasing;
    private diffColor;
    constructor(config?: VisualRegressionConfig);
    private ensureDirectories;
    /**
     * Compare a screenshot against baseline
     */
    compare(name: string, screenshot: Buffer, width: number, height: number): Promise<VisualRegressionResult>;
    /**
     * Compare two image buffers
     */
    private compareBuffers;
    /**
     * Generate a diff image highlighting differences
     */
    private generateDiffImage;
    /**
     * Get baseline file path for a test
     */
    private getBaselinePath;
    /**
     * Get actual file path for a test
     */
    private getActualPath;
    /**
     * Get diff file path for a test
     */
    private getDiffPath;
    /**
     * Get hash of a screenshot for deduplication
     */
    getScreenshotHash(screenshot: Buffer): string;
    /**
     * Clean up old actual screenshots
     */
    cleanup(maxAge?: number): void;
}
/**
 * Create a visual regression tester
 */
export declare function createVisualRegressionTester(config?: VisualRegressionConfig): VisualRegressionTester;
/**
 * Run visual regression tests
 */
export declare function runVisualRegressionTests(tests: Array<{
    name: string;
    screenshot: Buffer;
    width: number;
    height: number;
}>, config?: VisualRegressionConfig): Promise<{
    results: VisualRegressionResult[];
    summary: {
        total: number;
        passed: number;
        failed: number;
        updated: number;
    };
}>;