return {
  'mbbill/undotree',

  init = function()
    vim.g.undotree_WindowLayout = 2  -- tree: left, diff: bottom
    vim.g.undotree_DiffAutoOpen = 0  -- don't open diff by default
    vim.g.undotree_SetFocusWhenToggle = 1


    vim.g.undotree_TreeNodeShape  = ''
    vim.g.undotree_TreeVertShape  = '│'
    vim.g.undotree_TreeSplitShape = '╱'
    vim.g.undotree_TreeReturnShape = '╲'
  end,

  config = function()
    vim.keymap.set('n', '<leader>u', '<cmd>UndotreeToggle<cr>')
  end
}