/**
 * Object, created by Telegram desktop application. It allows usage of events.
 */
interface TelegramWebviewProxy {
    postEvent(event: string, data: string): void;
}
/**
 * TODO: Add description.
 */
interface WindowExternal {
    notify(search: string): void;
}
/**
 * Describes extracted event data from its text presentation.
 */
export interface EventData {
    /**
     * Event name.
     */
    type: string;
    /**
     * Event data.
     */
    data: string;
}
/**
 * Returns true, in case passed value contains object, created by Telegram
 * desktop application for communication via events.
 *
 * @param val - value to check.
 * @see TelegramWebviewProxy
 */
export declare function isDesktopEnv<T>(val: T): val is (T & {
    TelegramWebviewProxy: TelegramWebviewProxy;
});
/**
 * States that passed value has "external" which could notify native device.
 * TODO: We dont know that is "external" and "notify". This code was taken from
 *  previous source code.
 *
 * @param val - value to check.
 * @see WindowExternal
 */
export declare function hasExternal<T>(val: T): val is (T & {
    external: WindowExternal;
});
/**
 * Returns true in case, current environment is iframe.
 * @see https://stackoverflow.com/a/326076
 */
export declare function isBrowserEnv(): boolean;
export {};