/**
 * Screenshot masker — blur or black-box PII regions in captured screenshots.
 *
 * Strategy: inject a CSS overlay into the page before screenshot capture that
 * covers detected PII-likely elements (input[type=email], input[type=password],
 * elements with PII-containing text) with a blur or solid black mask.
 *
 * This is a CSS-based approach (no image processing library needed):
 * 1. Identify likely-PII DOM elements via selectors
 * 2. Add an overlaid <div> with blur/black filter at each element's bounding box
 * 3. Take screenshot
 * 4. Remove overlays
 *
 * Falls back gracefully if elements are not found or overlay injection fails.
 */
import type { Page } from 'playwright';
export interface MaskingOpts {
    /** Additional CSS selectors to mask (in addition to defaults) */
    extraSelectors?: string[];
    /** Masking style: 'blur' or 'blackout' */
    style?: 'blur' | 'blackout';
    /** Blur strength in px (default 8) */
    blurPx?: number;
}
export declare function maskScreenshot(page: Page, opts?: MaskingOpts): Promise<{
    maskedCount: number;
    screenshot: Buffer;
}>;