import { Option } from '../immutable/option';
import { ICollection } from '../internals/iCollection';
/**
 * A node for the linked list
 */
export declare class LinkedListNode<T> {
    readonly value: T;
    /**
     * Left Node
     */
    left: LinkedListNode<T> | undefined;
    /**
     * Right Node
     */
    right: LinkedListNode<T> | undefined;
    constructor(value: T);
}
/**
 * A doubly linked list
 */
export declare class DoublyLinkedList<T> implements ICollection<T> {
    /**
     * Converts the doubly linked list into an array
     */
    readonly asArray: T[];
    /**
     * Returns the first element of the list
     */
    readonly head: T | undefined;
    /**
     * Returns true if the list is empty
     */
    readonly isEmpty: boolean;
    /**
     * Returns the last element in the list
     */
    readonly tail: T | undefined;
    /**
     * Creates a new DoublyLinkedList with the provided values.
     */
    static of<A = never>(...t: A[]): DoublyLinkedList<A>;
    /**
     * Returns the size of the linked list
     */
    length: number;
    private headN;
    private tailN;
    private constructor();
    /**
     * Adds a new value to the list
     */
    add(val: T): LinkedListNode<T>;
    /**
     * Cleans removes all the elements from the list
     */
    empty(): void;
    /**
     * Refer [[ICollection.filter]]
     */
    filter(F: (A: T) => boolean): ICollection<T>;
    /**
     * Converts the linked list into a value
     */
    fold<C>(seed: C, f: (value: T, seed: C) => C): C;
    /**
     * Tests if the provided node is a part of the list or not in O(n) time complexity.
     */
    isConnected(n: LinkedListNode<T>): boolean;
    /**
     * Transforms the values inside the list using the transformer function, creating a new list.
     */
    map<B>(ab: (a: T) => B): ICollection<B>;
    /**
     * Removes the last inserted element
     */
    pop(): Option<T>;
    /**
     * Removes the provided node from the list.
     */
    remove(n: LinkedListNode<T>): void;
    /**
     * Remove the first element from the list
     */
    shift(): Option<T>;
}