import { HeaderItem } from '../../../domains/shared/header';
/**
 * Builds the built-in narrative-toggle header item, which shows or hides the widget's generated
 * narrative on demand.
 *
 * @param options - The narrative's current visibility and how to flip it.
 * @param options.isVisible - Whether the narrative is currently shown; selects icon and tooltip.
 * @param options.onToggle - Called when the button is clicked.
 * @returns The header item, marked as a built-in so it may claim its reserved id.
 * @internal
 */
export declare const createNarrativeToggleItem: ({ isVisible, onToggle, }: {
    isVisible: boolean;
    onToggle: () => void;
}) => HeaderItem;