import { ElementSelector, ElementRect } from '../lib/mugshot';
/**
 * Webdriver compatible client.
 */
export interface Webdriver {
    /**
     * Take a viewport screenshot and return a base64 string.
     *
     * @see https://w3c.github.io/webdriver/#take-screenshot
     */
    takeViewportScreenshot: () => Promise<string>;
    /**
     * Get the dimensions and coordinates of an element.
     *
     * @see https://w3c.github.io/webdriver/#get-element-rect
     *
     * If the selector matches more than 1 element then an array
     * of {@link ElementRect} should be returned, otherwise a single
     * {@link ElementRect} should be returned.
     *
     * Should return `null` if the selector doesn't match any element.
     *
     * Should return `0,0,0,0` for every element that is not visible.
     */
    getElementRect: (selector: ElementSelector) => Promise<ElementRect | ElementRect[] | null>;
    /**
     * Set the size of the __viewport__ (meaning window minus chrome).
     *
     * This is unlike setWindowRect which doesn't take the chrome into account.
     *
     * @see https://w3c.github.io/webdriver/#set-window-rect
     */
    setViewportSize: (width: number, height: number) => Promise<void>;
    /**
     * Execute a function in the current page context.
     *
     * @param func An asynchronous function returning a promise.
     *   Needs to be serializable.
     * @param args Will be passed to the function.
     *   Needs to be serializable.
     *
     * @see https://w3c.github.io/webdriver/#execute-async-script
     */
    execute: <R, A extends any[]>(func: (...args: A) => R, ...args: A) => Promise<R>;
}
/**
 * Thrown when the given selector doesn't match anything.
 */
export declare class ElementNotFoundError extends Error {
    constructor(selector: string);
}
/**
 * Thrown when the given selector matches an element that is not visible.
 */
export declare class ElementNotVisibleError extends Error {
    constructor(selector: string);
}