Delete Node in a Linked List solution using JavaScript

Below is my JavaScript solution to the LeetCode "Delete Node in a Linked List" question.

Time Complexity: Because this will only handle one node at a time, the time complexity is O(1).

Space Complexity: Because this approach will also only mutate the node that is passed in, the space complexity is O(1).

 * Definition for singly-linked list.
 * function ListNode(val) {
 *     this.val = val;
 *     this.next = null;
 * }
 * Notes:
 * - The linked list will have at least two elements.
 * - All of the nodes' values will be unique.
 * - Do not return anything from your function.
 * - The given node will not be the tail and it will always 
 *   be a valid node of the linked list.

 * Delete a node (except the tail) in a singly linked 
 * list, given only access to that node.
 * Time Complexity: O(1)
 * Space Complexity: O(1)
 * @param {ListNode} node
 * @return {void}
const deleteNode = node => {
    node.val = node.next.val;
    node.next = node.next.next;

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