import type { Simctl } from '../simctl';
/**
 * Gets base64 screenshot for device
 * It is required that Simulator is in _booted_ state.
 *
 * @since Xcode SDK 8.1
 * @return Base64-encoded Simulator screenshot.
 * @throws {Error} If the corresponding simctl subcommand command
 *                 returns non-zero return code.
 * @throws {Error} If the `udid` instance property is unset
 */
export declare function getScreenshot(this: Simctl): Promise<string>;
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