import { ObjectShorthandValue } from '../../../types';
import { TreeItemProps } from '../TreeItem';
export interface FlatTreeItem {
    /**
     * Also in TreeItemProps.
     * The index of the item among its siblings. Count starts at 1.
     */
    index: number;
    /**
     * Also in TreeItemProps.
     * Level of the tree/subtree that contains this item.
     */
    level: number;
    /**
     * Also in TreeItemProps.
     * true if the tree item is expanded (indicating tree item has subtree).
     * when tree item has no subtree, expanded is undefined
     */
    expanded?: boolean;
    /**
     * Also in TreeItemProps.
     * parent id of the tree item. For the top level tree items, parent is undefined
     */
    parent?: string;
    /**
     * Also in TreeItemProps.
     * Size of the tree/subtree that contains this item.
     */
    treeSize: number;
    /** true if the tree item has subtree, indicating childrenIds are not undefined */
    hasSubtree: boolean;
    /** children ids of the tree item. For leaf tree item, childrenIds is undefined */
    childrenIds?: string[];
    /** Shorthand props for the current item */
    item: ObjectShorthandValue<TreeItemProps>;
    /**
     * when selected=true, the tree item is fully selected, indicating all its descendents are fully selected;
     * when selected=false, the tree item is not selected, indicating none of its descendents is selected;
     * when selected='indeterminate', only part of the tree item's descendents are selected
     */
    selected?: boolean | 'indeterminate';
}
export declare type FlatTree = Record<string, FlatTreeItem>;
/**
 * @returns returns the flattened tree, and an array of all visible tree item ids in a Depth First order.
 */
export declare function flattenTree(items: ObjectShorthandValue<TreeItemProps>[], activeItemIds: string[], selectedItemIds: string[]): {
    flatTree: FlatTree;
    visibleItemIds: string[];
};