return {
  'goerz/jupytext.vim',
  lazy = false,
  config = function()
    vim.g.jupytext_fmt = 'py:percent'
    vim.g.jupytext_enable = 1
    vim.g.jupytext_pairing = 1

    local jupytext_bin = vim.fn.exepath('jupytext')
    if jupytext_bin ~= nil and jupytext_bin ~= '' then
      vim.g.jupytext_command = jupytext_bin
    else
      local preferred_python3 = '/opt/homebrew/bin/python3'
      local python3_bin = preferred_python3
      if vim.fn.executable(preferred_python3) ~= 1 then
        python3_bin = vim.fn.exepath('python3')
      end

      if python3_bin ~= nil and python3_bin ~= '' then
        vim.g.jupytext_command = python3_bin .. ' -m jupytext'
      else
        vim.schedule(function()
          vim.notify(
            'Jupytext: no `jupytext` or `python3` found in PATH. Install jupytext (e.g. `/opt/homebrew/bin/python3 -m pip install --user jupytext`) or set `vim.g.jupytext_command`.',
            vim.log.levels.WARN
          )
        end)
      end
    end

    local jupytext_group = vim.api.nvim_create_augroup('custom_jupytext', { clear = true })

    vim.api.nvim_create_autocmd('BufWritePost', {
      group = jupytext_group,
      pattern = '*.py',
      callback = function()
        local ipynb_file = vim.fn.expand('%:r') .. '.ipynb'
        if vim.fn.filereadable(ipynb_file) == 1 then
          vim.cmd('silent! Jupytext --sync')
        end
      end,
    })

    vim.api.nvim_create_autocmd('BufWritePost', {
      group = jupytext_group,
      pattern = '*.ipynb',
      callback = function()
        local py_file = vim.fn.expand('%:r') .. '.py'
        if vim.fn.filereadable(py_file) == 1 then
          vim.cmd('silent! Jupytext --sync')
        end
      end,
    })

    vim.api.nvim_create_autocmd({ 'BufReadPost', 'BufNewFile' }, {
      group = jupytext_group,
      pattern = '*.ipynb',
      callback = function()
        local py_file = vim.fn.expand('%:r') .. '.py'
        if vim.fn.filereadable(py_file) == 0 then
          vim.cmd('silent! Jupytext --to py:percent')
        end

        if vim.fn.filereadable(py_file) == 1 then
          vim.cmd('silent! edit ' .. vim.fn.fnameescape(py_file))
        end
      end,
    })
  end,
}