How to create a new vim command in lua?

Lua
2

Would this work?
If Preserve has a 100% chance of being defined:

vim.api.nvim_create_user_command('BufOnly',function()
  pcall(vim.fn.Preserve("exec '%bd|e#|bd#'"))
end,{})

If Preserve may not be defined:

vim.api.nvim_create_user_command('BufOnly',function()
  pcall(function()
    vim.fn.Preserve("exec '%bd|e#|bd#'")
  end)
end,{})
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