+local ts_utils = require('nvim-treesitter.ts_utils')
+
 local function map(lhs, rhs)
 	vim.keymap.set('n', lhs, function()
-		-- TODO
+		local node = ts_utils.get_node_at_cursor()
+		if node == nil then
+			error('No Tree-Sitter parser found.')
+		end
 	end, {
 		buffer = true,
 		noremap = true,