export declare const CLASSES: {
    tree: string;
    'tree.is-disabled': string;
    'tree--line': string;
    tree__group: string;
    'tree__group--root': string;
    tree__option: string;
    'tree__option.is-selected': string;
    'tree__option.is-disabled': string;
    'tree__option--root': string;
    'tree__option--first': string;
    'tree__option-dot': string;
    'tree__option-icon': string;
    'tree__option-arrow': string;
    'tree__option-arrow.is-expand': string;
    'tree__option-checkbox': string;
    'tree__option-content': string;
    tree__empty: string;
};
export declare const TREE_NODE_KEY: unique symbol;