return { -- use LSP as folding provider
  -- Stolen from
  -- https://github.com/chrisgrieser/.config/blob/73ae471f7278089fdc2925194eda4fd1067b316d/nvim/lua/plugins/folding.lua#L8
  'kevinhwang91/nvim-ufo',
  dependencies = 'kevinhwang91/promise-async',
  event = 'UIEnter', -- needed for folds to load in time and comments being closed
  keys = {
    { 'z?', vim.cmd.UfoInspect, desc = '󱃄 :UfoInspect' },
    {
      'zm',
      function()
        require('ufo').closeAllFolds()
      end,
      desc = '󱃄 Close All Folds',
    },
    {
      'zr',
      function()
        require('ufo').openFoldsExceptKinds { 'comment', 'imports' }
      end,
      desc = '󱃄 Open Regular Folds',
    },
    {
      'z1',
      function()
        require('ufo').closeFoldsWith(1)
      end,
      desc = '󱃄 Close L1 Folds',
    },
    {
      'z2',
      function()
        require('ufo').closeFoldsWith(2)
      end,
      desc = '󱃄 Close L2 Folds',
    },
    {
      'z3',
      function()
        require('ufo').closeFoldsWith(3)
      end,
      desc = '󱃄 Close L3 Folds',
    },
  },
  init = function()
    -- INFO fold commands usually change the foldlevel, which fixes folds, e.g.
    -- auto-closing them after leaving insert mode, however ufo does not seem to
    -- have equivalents for zr and zm because there is no saved fold level.
    -- Consequently, the vim-internal fold levels need to be disabled by setting
    -- them to 99.
    vim.opt.foldlevel = 99
    vim.opt.foldlevelstart = 99
  end,
  opts = {
    -- when opening the buffer, close these fold kinds
    -- close_fold_kinds_for_ft = {
    --   default = { 'imports', 'comment' },
    --   json = { 'array' },
    --   -- use `:UfoInspect` to get see available fold kinds
    -- },
    open_fold_hl_timeout = 800,
    -- provider_selector = function(_, ft, buftype)
    --   -- PERF disable folds on `log`, and only use `indent` for `bib` files
    --   if ft == 'log' then
    --     return ''
    --   end
    --   if ft == 'bib' then
    --     return 'indent'
    --   end
    --   -- ufo accepts only two kinds as priority, see https://github.com/kevinhwang91/nvim-ufo/issues/256
    --   if buftype ~= '' or vim.startswith(ft, 'git') or ft == '' then
    --     return 'indent'
    --   end
    --   return { 'lsp', 'treesitter' }
    -- end,
    -- show folds with number of folded lines instead of just the icon
    -- fold_virt_text_handler = function(virtText, lnum, endLnum, width, truncate)
    --   local hlgroup = 'NonText'
    --   local icon = ''
    --   local newVirtText = {}
    --   local suffix = ('  %s %d'):format(icon, endLnum - lnum)
    --   local sufWidth = vim.fn.strdisplaywidth(suffix)
    --   local targetWidth = width - sufWidth
    --   local curWidth = 0
    --   for _, chunk in ipairs(virtText) do
    --     local chunkText = chunk[1]
    --     local chunkWidth = vim.fn.strdisplaywidth(chunkText)
    --     if targetWidth > curWidth + chunkWidth then
    --       table.insert(newVirtText, chunk)
    --     else
    --       chunkText = truncate(chunkText, targetWidth - curWidth)
    --       local hlGroup = chunk[2]
    --       table.insert(newVirtText, { chunkText, hlGroup })
    --       chunkWidth = vim.fn.strdisplaywidth(chunkText)
    --       if curWidth + chunkWidth < targetWidth then
    --         suffix = suffix .. (' '):rep(targetWidth - curWidth - chunkWidth)
    --       end
    --       break
    --     end
    --     curWidth = curWidth + chunkWidth
    --   end
    --   table.insert(newVirtText, { suffix, hlgroup })
    --   return newVirtText
    -- end,
  },
}