import { PopupParams } from './types';
import { Bridge } from '../Bridge';
import { WebApp } from '../WebApp';
import { PopupEventsMap } from './events';
/**
 * Controls currently displayed application popup. It allows developers to
 * open new custom popups and detect popup-connected events.
 */
export declare class Popup {
    private bridge;
    private webApp;
    private ee;
    private _isOpened;
    /**
     * Changes current open state.
     *
     * @param value - new open state.
     * @private
     */
    private set isOpened(value);
    constructor(bridge: Bridge, webApp: WebApp);
    /**
     * Shows whether popup is currently opened.
     */
    get isOpened(): boolean;
    /**
     * Adds new event listener.
     */
    on: <E extends keyof PopupEventsMap>(event: E, listener: import("twa-core").EventListener<PopupEventsMap[E]>) => void;
    /**
     * Removes event listener.
     */
    off: <E extends keyof PopupEventsMap>(event: E, listener: import("twa-core").EventListener<PopupEventsMap[E]>) => void;
    /**
     * A method that shows a native popup described by the `params` argument.
     * Promise will be resolved when popup is closed. Resolved value will have
     * an identifier of pressed button.
     *
     * In case, user clicked outside the popup or clicked top right popup close
     * button, `null` will be returned.
     *
     * FIXME: On desktop, this function may work incorrectly.
     *  Issue: https://github.com/Telegram-Web-Apps/client-sdk/issues/5
     *
     * @param params - popup parameters.
     * @since Web App version 6.2+
     * @see preparePopupParams
     * @throws {Error} Popup is already opened.
     */
    show(params: PopupParams): Promise<string | null>;
    /**
     * A method that shows message in a simple alert with a 'Close' button.
     * Promise will be resolved when popup is closed.
     *
     * @param message - message to display.
     * @since Web App version 6.2+
     * @see show
     */
    showAlert(message: string): Promise<void>;
    /**
     * A method that shows message in a simple confirmation window with `OK`
     * and `Cancel` buttons. Promise will be resolved when popup is closed.
     * Resolved value will be `true` in case, user pressed `OK` button. The
     * result will be `false` otherwise.
     *
     * @param message - message to display.
     * @since Web App version 6.2+
     * @see show
     */
    showConfirm(message: string): Promise<boolean>;
}