To work with multi selected nodes (in Visual mode), I also extended tobealive's code to below.

-- over write default 'delete' command to 'trash'.
delete = function(state)
	local inputs = require("neo-tree.ui.inputs")
	local path = state.tree:get_node().path
	local msg = "Are you sure you want to trash " .. path
	inputs.confirm(msg, function(confirmed)
		if not confirmed then return end

		vim.fn.system { "trash", vim.fn.fnameescape(path) }
		require("neo-tree.sources.manager").refresh(state.name)
	end)
end,

-- over write default 'delete_visual' command to 'trash' x n.
delete_visual = function(state, selected_nodes)
	local inputs = require("neo-tree.ui.inputs")

	-- get table items count
	function GetTableLen(tbl)
		local len = 0
		for n in pairs(tbl) do
			len = len + 1
		end
		return len
	end

	local count = GetTableLen(selected_nodes)
	local msg = "Are you sure you want to trash " .. count .. " files ?"
	inputs.confirm(msg, function(confirmed)
		if not confirmed then return end
		for _, node in ipairs(selected_nodes) do
			vim.fn.system { "trash", vim.fn.fnameescape(node.path) }
		end
		require("neo-tree.sources.manager").refresh(state.name)
	end)
end,

nvim's reboot is required for that 'refresh' command to work.

Thanks for all your advices.

Support trash instead of delete #202

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