Best Practice of insert node with LS_SELECT_RAW and default value?

[hyaray]

I want basic feature like ${1:${VISUAL:val}}, It's hard to done with lua format for a beginner.
now I found a way like this:

1. define function return d function with index and default.

sn_i_visual = function(index, default)
	return d(index, function(args, parent)
		local raw = parent.snippet.env.LS_SELECT_RAW
        	if not raw or #raw == 0 then
			raw = default
		 end
		return sn(nil, i(index, raw))
	end)
end

used in snippets:
s("vimn", fmta("vim.notify(<>)", sn_i_visual(1, "abc"))),

I found fmta is much friednly than fmt in lua

[bew]

Yes this is basically how I do it as well:
https://github.com/bew/dotfiles/blob/b6df42b46e372f821f4744ae7283bcdbf6d47729/nvim-wip/lua/mycfg/snippets_by_ft/_utils.lua#L161-L175
I use LS_SELECT_DEDENT to make it easily work with indented selection.
I also add an insert node after the 'visual' selection to have a 'tabstop', make it easier to add something after ;)