pastojs: fixes filer class helper

compiler/packages/pastojs/src/pas2jsfiler.pp

@@ -3433,7 +3433,7 @@ begin
   // AncestorScope can be derived from DirectAncestor
   // CanonicalClassOf is autogenerated
   CanonicalClassOf:=Scope.CanonicalClassOf;
-  if aClass.ObjKind=okClass then
+  if aClass.ObjKind in ([okClass]+okAllHelpers) then
     begin
     if CanonicalClassOf=nil then
       RaiseMsg(20180217143821,aClass);