Features

Syntax

Feature	TC39	CoreJS	Babel	Civet	JS+
Async do expressions	✅	❌	✅	✅	✅
Decorators	✅	✅	✅	❌	✅
Discard binding	✅	❌	✅	❌	✅
Do expressions	✅	❌	✅	✅	✅
Export default from	✅	❌	✅	❌	✅
Pipeline operator	✅	❌	✅	✅	✅
Throw expressions	✅	❌	✅	❌	✅

Polyfills

Feature	TC39	CoreJS	Babel	Civet	JS+
Iterator chunking	✅	✅	❌	❌	✅
Math clamp	✅	✅	❌	❌	✅
Object property count	✅	❌	❌	❌	✅
Promise allKeyed	✅	❌	❌	❌	✅
Promise isPromise	✅	❌	❌	❌	✅
Random namespace	✅	❌	❌	❌	✅

Runtime

Feature	TC39	CoreJS	Babel	Civet	JS+
Chained comparisons	❌	❌	❌	✅	✅
Negative array subscript	✅	❌	❌	❌	✅
Typeof null operator	✅	❌	❌	❌	✅