chore: add TS2839 to JS files

Author: Jack-Works

src/compiler/program.ts

@@ -968,6 +968,8 @@ namespace ts {
         Diagnostics.let_is_not_allowed_to_be_used_as_a_name_in_let_or_const_declarations.code,
         Diagnostics.Class_constructor_may_not_be_a_generator.code,
         Diagnostics.Class_constructor_may_not_be_an_accessor.code,
+        // Type errors
+        Diagnostics.This_condition_will_always_return_0_since_JavaScript_compares_objects_by_reference_not_value.code,
     ]);
 
     /**