/**
 * Viewport Utilities
 *
 * Shared viewport parsing and configuration used by CDP and Playwright integrations.
 */
/** Default viewport dimensions */
export declare const DEFAULT_VIEWPORT: {
    width: number;
    height: number;
};
/** Preset viewport configurations */
export declare const VIEWPORT_PRESETS: {
    readonly default: {
        readonly width: 1512;
        readonly height: 3000;
    };
    readonly mobile: {
        readonly width: 375;
        readonly height: 667;
    };
    readonly tablet: {
        readonly width: 768;
        readonly height: 1024;
    };
    readonly desktop: {
        readonly width: 1440;
        readonly height: 900;
    };
};
export interface ViewportConfig {
    width: number;
    height: number;
    isMobile: boolean;
}
/**
 * Accepted viewport input shapes:
 *   - 'mobile' | 'tablet' | 'desktop' — named preset
 *   - `${number}x${number}` — explicit pixel dimensions, e.g. '1920x1080'
 * The bare `string` fallback stays for back-compat (parseViewport still
 * tolerates unknown values by falling back to the default), but new code
 * should use this narrower union to surface bad inputs at compile time.
 */
export type ViewportName = 'mobile' | 'tablet' | 'desktop' | `${number}x${number}`;
/**
 * Parse a viewport string into width, height, and mobile flag.
 *
 * Accepts:
 * - Named presets: 'mobile', 'tablet', 'desktop'
 * - Custom dimensions: '1920x1080'
 * - undefined/null: returns default viewport
 *
 * @param viewportName - The viewport preset name or dimensions string
 * @param defaultViewport - Optional default viewport to use (defaults to VIEWPORT_PRESETS.default)
 * @returns Parsed viewport configuration
 */
export declare function parseViewport(viewportName?: ViewportName | string, defaultViewport?: {
    width: number;
    height: number;
}): ViewportConfig;
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