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,

  keys = {
    { "<leader>u", "<cmd>UndotreeToggle<cr>" },
  },
}