return {
  'nyngwang/murmur.lua',
  config = function()
    HIGHLIGHT = 'highlight'
    vim.api.nvim_create_augroup(HIGHLIGHT, { clear = true })

    require('murmur').setup {
      cursor_rgb = 'darkgreen', -- default to '#393939'
      max_len = 80, -- maximum word-length to highlight
      -- disable_on_lines = 2000, -- to prevent lagging on large files. Default to 2000 lines.
      exclude_filetypes = {'log'},
      callbacks = {
        -- to trigger the close_events of vim.diagnostic.open_float.
        function ()
          -- Close floating diag. and make it triggerable again.
          vim.cmd('doautocmd InsertEnter')
          vim.w.diag_shown = false
        end,
      }
    }
    vim.api.nvim_create_autocmd('CursorHold', {
      group = HIGHLIGHT,
      pattern = '*',
      callback = function ()
        -- skip when a float-win already exists.
        if vim.w.diag_shown then return end

        -- open float-win when hovering on a cursor-word.
        if vim.w.cursor_word ~= '' then
          vim.diagnostic.open_float(nil, {
            focusable = true,
            close_events = { 'InsertEnter' },
            border = 'rounded',
            source = 'always',
            prefix = ' ',
            scope = 'cursor',
          })
          vim.w.diag_shown = true
        end
      end
    })
  end
  -- 'tzachar/local-highlight.nvim',
  -- config = function()
  --   require('local-highlight').setup({
  --     file_types = {'python', 'cpp', 'rust', 'lua', 'cmake'}
  --   })
  -- end
}