/**
 * Check if the current window has an opener window with the same origin and optional pathname.
 * This is useful for checking if the current window was opened by another window from within the same application.
 * @remarks If the current window was opened by another window, the opener window is accessible via `window.opener`.
 * There could still be an opener if the opener window is closed or navigated away or if the opener window is not from the same origin,
 * but this function will only return `true` if the opener window is accessible and has the same origin and optional pathname.
 * @param {string} [pathname] Optional pathname to check if the opener window has the same pathname.
 * @param {Window} [windowLike] The window-like object to use for checking the opener. Default is `window`.
 * @returns {boolean} `true` if the current window has an opener window with the same origin and optional pathname, otherwise `false`.
 */
export declare function hasOwnOpener(pathname?: string, windowLike?: Window): boolean;