/**
 * Tracks loading state of the page.
 *
 * @returns Readiness of the [`document`](https://developer.mozilla.org/docs/Web/API/Document), which is `'loading'` by default.
 *
 * @example
 * function Component() {
 *   const documentReadiness = useDocumentReadiness();
 *   if (documentReadiness === 'interactive') {
 *     // You may interact with any element of the document from now
 *   }
 *   // ...
 * }
 */
export default function useDocumentReadiness(): DocumentReadyState;