kickstart.nvim/lua/custom/plugins/undotree.lua

return {
  'mbbill/undotree',
  keys = {
    { '<leader>u', '<cmd>UndotreeToggle<cr>', desc = 'Toggle undotree' },
  },
  config = function()
    vim.g.undotree_SetFocusWhenToggle = 1
  end,
}