add types

Author: mlysle

lua/treewalker/nodes.lua

@@ -176,10 +176,13 @@ function M.next_sib(node)
   return node:next_named_sibling()
 end
 
+---@param node TSNode
+---@param fn function
+---@return TSNode | nil
 function M.farthest_sibling(node, fn)
-  ---@type TSNode | nil
   if not node then return nil end
 
+  ---@type TSNode | nil
   local iter = fn(node)
 
   while iter do