Реализация стека

class Stack {
    constructor() {
        this.size = 0;
        this.head = null;
        this.tail = null;
    }

    push(value) {
        const node = { value, next: null, prev: null };

        node.prev = this.tail;

        if (this.tail) {
            this.tail.next = node;
            this.tail = node;
        } else {
            this.head = this.tail = node;
        }

        this.size++;
    }

    pop() {
        if (this.isEmpty()) {
            throw new Error('Не могу удалить из пустого стека');
        }

        const node = this.tail;
        const prevNode = node.prev;

        if (prevNode) {
            node.prev = null;
            prevNode.next = null;
        }

        this.tail = prevNode;

        if (this.head === node) {
            this.head = prevNode;
        }

        this.size--;

        return node;
    }

    peek() {
        return this.tail;
    }

    isEmpty() {
        return this.tail === null;
    }
}