import type { ThemeIdsWithOverrides } from '@atlaskit/tokens/theme-config';
/**
 * Checks if a theme is mounted in the document head.
 *
 * Eventually this won't be necessary as we'll utilise AppProvider context
 * to track theme loading.
 */
export declare function isThemeMounted(themeId: ThemeIdsWithOverrides): false | Element | null;