export function checkState(): boolean;
/**
 * Executes a callback when the window 'load' event fires, or immediately if the load event has already occurred.
 * Sets up a backup polling mechanism in the rare case that the browser does not fire the load event when the page has loaded,
 * such as in certain iframe scenarios like ChatGPT connector frames. Cannot use document.readystatechange event here because
 * it blocks back/forward cache in Safari browsers.
 * @param {Function} cb
 * @param {boolean} [useCapture]
 * @returns {void}
 */
export function onWindowLoad(cb: Function, useCapture?: boolean): void;
export function onDOMContentLoaded(cb: any): any;
export function onPopstateChange(cb: any): any;
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