treeToArrayStack(root) {
    const stack = [root]
      const result = []

      while (stack.length > 0) {
        const node = stack.pop()
        result.push({ ...node })

        if (node.children) {
          stack.push(...node.children.reverse())
          delete result[result.length - 1].children
        }
      }
      return result
    },
this.treeToArrayStack(initList)