import { ICollapsibleSectionProps, ICollapsibleSectionViewProps } from './CollapsibleSection.types';
import { BaseState } from '../../utilities/BaseState';
export declare type ICollapsibleSectionState = Pick<ICollapsibleSectionViewProps, 'collapsed' | 'titleElementRef' | 'onClick' | 'onKeyDown' | 'onRootKeyDown'>;
export declare class CollapsibleSectionState extends BaseState<ICollapsibleSectionProps, ICollapsibleSectionViewProps, ICollapsibleSectionState> {
    private _titleElement;
    constructor(props: CollapsibleSectionState['props']);
    private _onClick;
    private _onRootKeyDown;
    private _onKeyDown;
}