/// <reference types="node" />
/**
 * A screenshot renderer takes screenshots of arbitrary URLs.
 *
 * This is an abstraction around a browser. In particular, it allows us to wrap
 * Chrome within Docker to ensure screenshots are consistent even when tests are
 * run from a different platform (e.g. Mac OS).
 */
export interface ScreenshotRenderer {
    start(): Promise<void>;
    stop(): Promise<void>;
    /**
     * Returns a buffer representing a PNG screenshot, or `null` when screenshot
     * comparison is delegated to a third-party.
     */
    render(name: string, url: string, viewport?: Viewport): Promise<Buffer | string | void>;
}
export interface Viewport {
    /** The page width in pixels. */
    width: number;
    /** The page height in pixels. */
    height: number;
    /**
     * Specify device scale factor (can be thought of as dpr).
     * @default 1
     */
    deviceScaleFactor?: number;
    /**
     * Whether the `meta viewport` tag is taken into account.
     * @default false
     */
    isMobile?: boolean;
    /**
     * Specifies if viewport supports touch events.
     * @default false
     */
    hasTouch?: boolean;
    /**
     * Specifies if viewport is in landscape mode.
     * @default false
     */
    isLandscape?: boolean;
}