/**
 * Represents a function that converts data into a string. It is used as an
 * alternative string conversion method opposed to `${data}`.
 *
 * @generic `D` The type of data that will be stored in the `Node`
 */
export declare type ToStringCallback<D extends unknown> = (data: D) => string;
/**
 * A simple node that holds a piece of data and an array of connected children.
 * It also possess a simple `toString` method.
 *
 * @generic `D` The type of data that will be stored in the `Node`
 */
declare class Node<D extends unknown> {
    /**
     * A piece of data. The type of which is determined by a generic (at least
     * in Typescript).
     */
    data: D;
    /**
     * Connections to children that are also instances of `Node`.
     */
    children: (Node<D> | null)[];
    /**
     * Holds the value for wether or not the children puffer should be enabled.
     * Meaning if the array should expand when a child is added.
     *
     * The default value is false, since this is the way a `LinkedList` works.
     */
    childrenPuffer: boolean;
    /**
     * Holds the size of the children puffer. Meaning the maximum size of the
     * children array.
     *
     * This is only relevant if the `childrenPuffer` is enabled.
     */
    childrenPufferSize: number;
    /**
     * @param data A piece of data that will be held by the `Node`
     * @param children A rest array that contains all connections to other `Nodes`
     */
    constructor(data: D, ...children: (Node<D> | null)[]);
    /**
     * Returns the first child that was specified in the children array.
     *
     * Sets the first element of the children array equal to the passed child.
     */
    get child(): Node<D> | null;
    set child(child: Node<D> | null);
    /**
     * Converts the `Node` to a string. It simply takes the stored data to a
     * string and returns it.
     *
     * @param callback A function that takes data and converts it to a string
     * @returns The `Node` as a string
     */
    toString(callback?: ToStringCallback<D>): string;
    /**
     * Converts the children array of instances of `Node` into an array that
     * only contains their data.
     *
     * @returns An array of the data the children contain
     */
    toChildrenArray(): (D | null)[];
}
export default Node;