I think there should be typeof predefined[v] !== 'boolean' instead of…

… "predefined[v] !== 'boolean'" because predefined is a has with boolean values :)


Actually there is no need to check the type, better way is just "predefined[v] !== true"

fulljslint.js

@@ -4096,7 +4096,7 @@ loop:   for (;;) {
 // then we have an undefined variable.
 
             } else if (funct['(global)']) {
-                if (option.undef && predefined[v] !== 'boolean') {
+                if (option.undef && typeof predefined[v] !== 'boolean') {
                     warning("'{a}' is not defined.", token, v);
                 }
                 note_implied(token);