I can't use Lua function to open Neotree for all tabs

[0xnofoot]

local function openNeotree()
local tabs = vim.fn.gettabinfo()

			for _, tab in ipairs(tabs) do
				vim.api.nvim_command("tabnext " .. tab.tabnr)
				vim.api.nvim_command("Neotree show")
			end
		end

it does not work, just will open neotree in first tab.

[cseickel]

It seems that when you call the neotree command, the neovim APIs are still reporting that the first tab is focused even though you have issued the vimscript command to change tabs. Have you try using the lua api instead?

If what you want is to have the tree open in all tabs, it might be a better option to just run that command with an autocmd that runs after you switch tabs.