/**
 * Visual Regression Tester (OWL-003)
 *
 * Compares screenshots to detect visual changes in web pages.
 * Integrates with workflow recording for end-to-end visual regression testing.
 *
 * Features:
 * - Baseline management (create, update, delete)
 * - Pixel-level comparison using pixelmatch
 * - Diff image generation for visual debugging
 * - Workflow integration for automated visual testing
 * - Configurable thresholds and ignore regions
 */
import type { VisualBaseline, VisualDiffResult, VisualRegressionTestResult, CaptureBaselineOptions, VisualCompareOptions, VisualRegressionTesterConfig, VisualRegressionEvent, WorkflowVisualTestConfig, WorkflowVisualTestResult } from '../types/visual-regression.js';
import type { Workflow } from '../types/workflow.js';
import type { Page } from 'playwright';
export declare class VisualRegressionTester {
    private config;
    private baselines;
    private eventListeners;
    constructor(config?: Partial<VisualRegressionTesterConfig>);
    /**
     * Capture a baseline screenshot from a Playwright page
     */
    captureBaseline(page: Page, url: string, options: CaptureBaselineOptions): Promise<VisualBaseline>;
    /**
     * Capture a baseline from base64 image data (without Playwright)
     */
    captureBaselineFromBase64(url: string, screenshotBase64: string, options: CaptureBaselineOptions): Promise<VisualBaseline>;
    /**
     * Compare a new screenshot against a baseline
     */
    compareWithBaseline(baselineId: string, newScreenshotBase64: string, options?: VisualCompareOptions): Promise<VisualRegressionTestResult>;
    /**
     * Compare a new screenshot from Playwright page against a baseline
     */
    testPage(page: Page, baselineId: string, options?: VisualCompareOptions & {
        waitBeforeCapture?: number;
    }): Promise<VisualRegressionTestResult>;
    /**
     * Compare two images and return diff result
     */
    compareImages(baselineBase64: string, newBase64: string, options?: VisualCompareOptions): Promise<VisualDiffResult>;
    /**
     * Test a workflow for visual regressions
     */
    testWorkflow(workflow: Workflow, captureNewScreenshots: (stepNumber: number, url: string) => Promise<string>, config: WorkflowVisualTestConfig): Promise<WorkflowVisualTestResult>;
    /**
     * Update an existing baseline with a new screenshot
     */
    updateBaseline(baselineId: string, newScreenshotBase64: string): Promise<VisualBaseline | null>;
    /**
     * Get a baseline by ID
     */
    getBaseline(baselineId: string): VisualBaseline | undefined;
    /**
     * Get baselines for a URL
     */
    getBaselinesForUrl(url: string): VisualBaseline[];
    /**
     * Get baselines for a domain
     */
    getBaselinesForDomain(domain: string): VisualBaseline[];
    /**
     * Get baselines for a workflow
     */
    getBaselinesForWorkflow(workflowId: string): VisualBaseline[];
    /**
     * List all baselines
     */
    listBaselines(): VisualBaseline[];
    /**
     * Delete a baseline
     */
    deleteBaseline(baselineId: string): Promise<boolean>;
    /**
     * Add event listener
     */
    on(callback: (event: VisualRegressionEvent) => void): void;
    /**
     * Remove event listener
     */
    off(callback: (event: VisualRegressionEvent) => void): void;
    /**
     * Export baselines to JSON
     */
    exportBaselines(): string;
    /**
     * Import baselines from JSON
     */
    importBaselines(json: string): number;
    /**
     * Clean up old diff images
     */
    cleanupDiffs(): Promise<number>;
    private ensureDirectories;
    private loadBaselines;
    private saveBaseline;
    private getBaselineFilePath;
    private generateBaselineId;
    private generateTestId;
    private getWorkflowStepBaselineId;
    private enforceBaselineLimit;
    private hideElements;
    private emitEvent;
}
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