typechecked optargs constructors for Sorter

lua/nvim-tree/class.lua

@@ -1,12 +1,12 @@
 ---Generic class, useful for inheritence.
----@class (exact) Class
-local Class = {}
+---@class (exact) ClassOld
+local ClassOld = {}
 
 ---@generic T
 ---@param self T
 ---@param o T|nil
 ---@return T
-function Class:new(o)
+function ClassOld:new(o)
   o = o or {}
 
   setmetatable(o, self)
@@ -20,7 +20,7 @@ end
 ---@generic T
 ---@param class T
 ---@return boolean
-function Class:is(class)
+function ClassOld:is(class)
   local mt = getmetatable(self)
   while mt do
     if mt == class then
@@ -35,13 +35,13 @@ end
 ---@generic T
 ---@param class T
 ---@return T|nil
-function Class:as(class)
+function ClassOld:as(class)
   return self:is(class) and self or nil
 end
 
 -- avoid unused param warnings in abstract methods
 ---@param ... any
-function Class:nop(...) --luacheck: ignore 212
+function ClassOld:nop(...) --luacheck: ignore 212
 end
 
-return Class
+return ClassOld