import type { RemoteDebugger } from '../remote-debugger';
import type { Rect } from '@appium/types';
/**
 * Options for capturing a screenshot.
 */
export interface ScreenshotCaptureOptions {
    /** The rectangle to capture. If null, captures the whole viewport. */
    rect?: Rect | null;
    /** The coordinate system to use for the rectangle. */
    coordinateSystem?: 'Viewport' | 'Page';
}
/**
 * Captures a screenshot of a rectangular area of the page or the entire viewport.
 * If no rectangle is provided, captures the full viewport by default.
 *
 * @param opts - Screenshot capture options. If not provided, captures the entire viewport.
 *               - rect: The rectangle to capture. If null, captures the whole viewport.
 *               - coordinateSystem: The coordinate system to use ('Viewport' or 'Page').
 *                                  Defaults to 'Viewport'.
 * @returns A promise that resolves to a base64-encoded string of the screenshot
 *          (without the data URL prefix).
 */
export declare function captureScreenshot(this: RemoteDebugger, opts?: ScreenshotCaptureOptions): Promise<string>;
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