Method addChild

handsontable/src/utils/dataStructures/tree.ts:136–139

* Adds a node to tree leaves. Added node is linked with the parent node through "parent" property. * * @param {TreeNode} node A TreeNode to add.

(node: TreeNode<T>)

   * @param {TreeNode} node A TreeNode to add.
   */
  addChild(node: TreeNode<T>) {
    node.parent = this;
    this.childs.push(node);
  }

  /**
   * @memberof TreeNode#