return {
  'toppair/peek.nvim',
  build = 'deno task --quiet build:fast',
  ft = { "markdown", "md" },
  config = function()
    -- default config:
    require('peek').setup({
      app = 'browser',          -- open in a local browser. not deno

      auto_load = true,         -- whether to automatically load preview when
                                -- entering another markdown buffer
      close_on_bdelete = true,  -- close preview window on buffer delete

      syntax = true,            -- enable syntax highlighting, affects performance

      theme = 'dark',           -- 'dark' or 'light'

      update_on_change = true,

      -- relevant if update_on_change is true
      throttle_at = 200000,     -- start throttling when file exceeds this
                                -- amount of bytes in size
      throttle_time = 'auto',   -- minimum amount of time in milliseconds
                                -- that has to pass before starting new render
    })

    local peek = require('peek')

    vim.api.nvim_create_user_command('PeekOpen', function()
      if not peek.is_open() and vim.bo[vim.api.nvim_get_current_buf()].filetype == 'markdown' then
        --vim.fn.system('i3-msg split horizontal')
        peek.open()
      end
    end, {})

    vim.api.nvim_create_user_command('PeekClose', function()
      if peek.is_open() then
        peek.close()
        --vim.fn.system('i3-msg move left')
      end
    end, {})
  end
}