/**
 * Checks if a given object is now a tree node.
 *
 * @param value Value to check.
 * @returns true if it is a tree node, false otherwise.
 */
export declare function isTreeNode(value: unknown): value is object;
/**
 * Asserts a given object is now a tree node, or throws otherwise.
 *
 * @param value Value to check.
 * @param argName Argument name, part of the thrown error description.
 */
export declare function assertIsTreeNode(value: unknown, argName?: string): asserts value is object;