import { AnyRecord, Nullish } from "../types";
import { BaseFlattedTreeNode, BaseTreeNode } from "./types";
/**
 * Flattened tree data structure based on pre-order traversal.
 */
export declare const flattenTree: <T extends AnyRecord<string, any>>(tree: T[], transform: (node: BaseFlattedTreeNode<any, T>, indexes: number[]) => any, options?: FlattenTreeOptions) => BaseFlattedTreeNode<any, any>[];
/**
 * Check is Tree Root
 */
export declare const isTreeRoot: <T extends {
    depth?: number | undefined;
}>(node: Nullish | T) => node is Nullish;
export interface FlattenTreeOptions {
    childrenFieldName?: (node: BaseTreeNode) => BaseTreeNode[];
}
export interface FlattenTreeNodeRoot<T> {
    depth: number;
    children: T[];
}
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