'use strict';

class Node {
  constructor(parent, name) {
    this.name = name;
    if (parent) {
      this.parent = parent;
      parent[name] = this;
    }
  }
}

// Usage

const root = new Node(null, 'root');
const n1 = new Node(root, 'n1');
const n2 = new Node(root, 'n2');
const n3 = new Node(root, 'n3');

console.dir(root, { depth: null });