import React, { PropsWithChildren } from 'react';
import type { HeadlineProps } from './Headline';
export interface CollapsibleHeadlineProps extends Omit<HeadlineProps, 'addition' | 'children'> {
    /** The headline text — always visible. */
    header: React.ReactNode;
    /** Controlled expanded state. When omitted, the component manages its own state. */
    expanded?: boolean;
    /** Called when the toggle is clicked. */
    onToggle?: () => void;
    /** id of the panel element, used for aria-controls. Generated automatically if omitted. */
    controls?: string;
    /** Extra content rendered between the headline text and the toggle button. */
    addition?: React.ReactNode;
    /**
     * When set in uncontrolled mode, the component persists its expanded
     * state to localStorage under this key.
     */
    storageKey?: string;
    /**
     * Initial expanded state when uncontrolled and no persisted storageKey
     * value exists yet. Defaults to true.
     */
    defaultExpanded?: boolean;
}
export declare function CollapsibleHeadline({ header, expanded, onToggle, controls, addition, storageKey, defaultExpanded, children, size, variant, weight, ...headlineProps }: PropsWithChildren<CollapsibleHeadlineProps>): import("react/jsx-runtime").JSX.Element;