import React, { ReactNode } from 'react';
declare type NavLabelFn = (props: TreeItem & {
    isExpanded: boolean;
}) => ReactNode;
export declare type TreeItems = TreeItem[];
export declare type TreeItem = {
    /** Unique id */
    id?: string;
    /** Label of the item */
    label?: ReactNode | NavLabelFn;
    /** Initial expanded state */
    expanded?: boolean;
    /** Icon in front of the label */
    icon?: ReactNode;
    /** Widget or icon to place at the end of the item */
    widget?: ReactNode;
    /** Array of child/sub-menu items */
    items?: TreeItems;
    /** href parameter for anchor type child elements */
    href?: string;
    /** event handler onClick */
    onClick?: (id: string) => void;
};
export declare const hasActiveChidlren: (item: TreeItem, active?: Pick<TreeItem, "id" | "label"> | undefined) => boolean;
export declare const expandTreeItems: (items: TreeItems, expanded: boolean) => TreeItems;
export declare const getTreeItemsStats: (items: TreeItems) => {
    total: number;
    expanded: number;
};
export declare const getFlatChildrenIds: (children?: TreeItems | undefined) => TreeItems;
export declare const getChildrenById: (children?: TreeItems | undefined, id?: string | undefined) => TreeItems | undefined;
export declare type TreeOwnProps = {
    /** Array of child items */
    items: TreeItems;
    /** POsition of the expand/collapse arrow */
    arrowPosition?: 'start' | 'end';
    /** Initially active item */
    activeItem?: Pick<TreeItem, 'id' | 'label'>;
    /** If specified, will expand all items with chidren */
    expandAll?: boolean;
    /** Function that will be called when the user selects a item */
    onSelect?: (item?: TreeItem) => void;
    /**
     * Function that will be called on expand/collapse
     */
    onExpandCollapse?: (expandedCount: number) => void;
    /** If specified, will filter the items by the search terms */
    search?: string;
    /**
     * custom chevron icon
     */
    chevronIcon?: ReactNode;
    /**
     * indentation in pixels for each elevel, By default 6 pixels
     */
    indentPixels?: number;
    /**
     * row link class - to avoid anchor in anchor warning
     */
    rowLinkClass?: React.ElementType;
};
export interface TreeState {
    expandedItems?: TreeItems;
    originalExpandAll?: boolean;
    search?: string;
    items?: TreeItems;
    filteredItems?: TreeItems;
    collapsibleItems?: TreeItems;
    allExpanded?: boolean;
    expandAll?: boolean;
}
export declare const stateFromProps: ({ items, expandAll, activeItem, search, }: Pick<TreeOwnProps, 'items' | 'expandAll' | 'activeItem' | 'search'>) => TreeState;
export {};