d5fd2c97e9
KubeJS uses Rhino as its JS engine, which doesn't support array-spread syntax (`[...a, ...b]`). The line `[...WAYSTONE_ITEMS, ...COIN_ITEMS] .forEach(...)` threw EvaluatorException: syntax error at jei_hides.js:46 on client launch, surfacing the KubeJS client script errors dialog. Fix: use Array.prototype.concat() which is universal JS. Also extracted the hide-quietly helper into a named function for readability.