interface Tree {
  id: number
  label: string
  children?: Tree[]
}

export const dataSource = ref<Tree[]>([
  {
    id: 1,
    label: 'Level one 1',
    children: [
      {
        id: 4,
        label: 'Level two 1-1',
        children: [
          {
            id: 9,
            label: 'Level three 1-1-1'
          },
          {
            id: 10,
            label: 'Level three 1-1-2'
          }
        ]
      }
    ]
  },
  {
    id: 2,
    label: 'Level one 2',
    children: [
      {
        id: 5,
        label: 'Level two 2-1'
      },
      {
        id: 6,
        label: 'Level two 2-2'
      }
    ]
  },
  {
    id: 3,
    label: 'Level one 3',
    children: [
      {
        id: 7,
        label: 'Level two 3-1'
      },
      {
        id: 8,
        label: 'Level two 3-2'
      }
    ]
  }
])