/**
 * Device Emulation
 *
 * Named device presets using Playwright's built-in device definitions.
 * Supports batch screenshots at multiple viewports/devices.
 */
type Page = import('playwright').Page;
export interface DeviceConfig {
    name: string;
    viewport: {
        width: number;
        height: number;
    };
    userAgent?: string;
    deviceScaleFactor?: number;
    isMobile?: boolean;
    hasTouch?: boolean;
}
/**
 * Built-in device presets. Subset of Playwright's device library
 * covering the most common testing targets.
 */
export declare const DEVICE_PRESETS: Record<string, DeviceConfig>;
/** Names a user might type (presets + aliases) for help/error messages. */
export declare function listDeviceNames(): string[];
/**
 * Parse a device name (case-insensitive) to a DeviceConfig.
 * Falls back to custom viewport parsing for "WIDTHxHEIGHT" format.
 */
export declare function parseDevice(name: string): DeviceConfig | null;
/**
 * Take screenshots at multiple device configurations.
 */
export declare function takeDeviceScreenshots(page: Page, devices: string[], options?: {
    fullPage?: boolean;
}): Promise<{
    results: Array<{
        device: DeviceConfig;
        buffer: Buffer;
    }>;
    unknown: string[];
}>;
export {};
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