import type { JSHandle } from '@playwright/test';
import type { E2EPage } from '../playwright-declarations';
/**
 * The EventSpy class allows developers to listen for a particular event emission and
 * pass/fail the test based on whether or not the event was emitted.
 * Based off https://github.com/ionic-team/stencil/blob/16b8ea4dabb22024872a38bc58ba1dcf1c7cc25b/src/testing/puppeteer/puppeteer-events.ts#L64
 */
export declare class EventSpy {
    eventName: string;
    /**
     * Keeping track of a cursor ensures that no two spy.next() calls point to the same event.
     */
    private cursor;
    private queuedHandler;
    events: CustomEvent[];
    constructor(eventName: string);
    get length(): number;
    get firstEvent(): CustomEvent<any>;
    get lastEvent(): CustomEvent<any>;
    next(): Promise<CustomEvent<any>>;
    push(ev: CustomEvent): void;
}
/**
 * For internal use only.
 *
 * Initializes information required to spy on events.
 * The stencilOnEvent function is called in the context of the current page.
 * This lets us respond to an event listener created within the page itself.
 *
 * @param page The Playwright test page object.
 */
export declare const initPageEvents: (page: E2EPage) => Promise<void>;
/**
 * For internal use only.
 *
 * Adds a new event listener in the current page context to updates
 * the _e2eEvents map when an event is fired.
 *
 * @param page The Playwright test page object.
 * @param elmHandle A {@link JSHandle} representing the element to listen for events on.
 * @param eventName The event name to listen for.
 * @param callback The callback to execute when the event is fired.
 */
export declare const addE2EListener: (page: E2EPage, elmHandle: JSHandle, eventName: string, callback: (ev: any) => void) => Promise<void>;