import { ElementFinder, WebElement } from 'protractor';
export interface LooksSame {
    (img1: string, img2: string, options: Object, check: (error: any, equal: any) => void): any;
    (img1: string, img2: string, check: (error: any, equal: any) => void): any;
    createDiff(options: Object, err: Function): any;
}
/**
 * Compare a screenshot to a reference, or "golden" image.
 * Returns a Promise that resolves to whether or not the
 * screenshot is a match. If the UPDATE_SCREENSHOTS environment
 * variable is set, the promise resolves to true and the
 * golden image is updated.
 *

 * @param data - The screenshot image data.
 * @param golden - The path to the golden image to compare to.
 * @param outputFolder - The destination path for saving the diff. if it is not provided, the difference image will not be

 *   saved.
 */
export declare function compareScreenshot(data: any, golden: any, outputFolder?: any): Promise<string>;
export declare function addMask(el: ElementFinder, color: any, zIndex?: number, xOffset?: number, yOffset?: number, sizeMultiplier?: number): Promise<WebElement>;
export declare function removeMask(mask: WebElement): Promise<void>;