neovim/runtime/plugin/nvim.lua

vim.api.nvim_create_user_command('Inspect', function(cmd)
  if cmd.bang then
    vim.print(vim.inspect_pos())
  else
    vim.show_pos()
  end
end, { desc = 'Inspect highlights and extmarks at the cursor', bang = true })

vim.api.nvim_create_user_command('InspectTree', function(cmd)
  if cmd.mods ~= '' or cmd.count ~= 0 then
    local count = cmd.count ~= 0 and cmd.count or ''
    local new = cmd.mods ~= '' and 'new' or 'vnew'

    vim.treesitter.inspect_tree({
      command = ('%s %s%s'):format(cmd.mods, count, new),
    })
  else
    vim.treesitter.inspect_tree()
  end
end, { desc = 'Inspect treesitter language tree for buffer', count = true })